Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
Mariana Minerals is looking for a highly motivated Full Stack Software Engineer to work on building the critical minerals supply chain to support the world’s energy transition.
As a Full Stack Software Engineer at Mariana Minerals, you will lead the development and deployment of software to accelerate the engineering and construction of physical infrastructure that is critical to building the minerals supply chain. Responsibilities will include building integrations with the existing software tools for engineering and construction, extending these tools to fill in gaps and address pain points identified by Mariana’s internal engineering and construction teams, working with Mariana’s ML engineers to integrate LLMs to tackle specific challenges around unstructured data ingestion and understanding, and working with Mariana’s internal teams to develop a new “operating system” for the engineering, construction, and operation of Mariana’s mineral processing facilities.
What You’ll Do
Work closely with Mariana’s internal engineering, construction, and operations teams to identify and build internal software tools to accelerate the deployment of Mariana’s mineral processing facilities.
Build data integrations with the existing suite of engineering/construction tools such as Autodesk.
Build net new web experiences and applications that will be used by Mariana's internal teams and partners to help build capital project faster and more efficiently.
Evaluate existing software in the ecosystem to assist Mariana’s internal teams
Work closely with Mariana’s ML engineers to implement novel LLM powered experiences that assist Mariana’s internal teams.
Assist with the data architecture for Mariana’s data pipelines to feed the training of novel ML models that control Mariana’s mineral processing facilities and provide visibility into the operation of the facilities to the internal Mariana team.
What You’ll Bring
Strong understanding of software engineering in a professional capacity (1.5+ years preferred).
Ability to work with non-software stakeholders to identify pain points and needs, scope level of effort required for new features, and then drive implementation of these features.
Self-starter mindset, ability to bring clarity to high ambiguity situations, and excitement to work with non-software stakeholders directly.
Ability to work across the entire stack from deploying servers to writing front end code and everything in between (or demonstrated proficiency in one of these areas and the desire to expand your skillset).
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nMariana Minerals is looking for a highly motivated Full Stack Software Engineer to work on building the critical minerals supply chain to support the world’s energy transition.\n\nAs a Full Stack Software Engineer at Mariana Minerals, you will lead the development and deployment of software to accelerate the engineering and construction of physical infrastructure that is critical to building the minerals supply chain. Responsibilities will include building integrations with the existing software tools for engineering and construction, extending these tools to fill in gaps and address pain points identified by Mariana’s internal engineering and construction teams, working with Mariana’s ML engineers to integrate LLMs to tackle specific challenges around unstructured data ingestion and understanding, and working with Mariana’s internal teams to develop a new “operating system” for the engineering, construction, and operation of Mariana’s mineral processing facilities.\n\nWhat You’ll Do\n\n - Work closely with Mariana’s internal engineering, construction, and operations teams to identify and build internal software tools to accelerate the deployment of Mariana’s mineral processing facilities.\n\n - Build data integrations with the existing suite of engineering/construction tools such as Autodesk.\n\n - Build net new web experiences and applications that will be used by Mariana's internal teams and partners to help build capital project faster and more efficiently.\n\n - Evaluate existing software in the ecosystem to assist Mariana’s internal teams\n\n - Work closely with Mariana’s ML engineers to implement novel LLM powered experiences that assist Mariana’s internal teams.\n\n - Assist with the data architecture for Mariana’s data pipelines to feed the training of novel ML models that control Mariana’s mineral processing facilities and provide visibility into the operation of the facilities to the internal Mariana team.\n\nWhat You’ll Bring\n\n - Strong understanding of software engineering in a professional capacity (1.5+ years preferred).\n\n - Ability to work with non-software stakeholders to identify pain points and needs, scope level of effort required for new features, and then drive implementation of these features.\n\n - Self-starter mindset, ability to bring clarity to high ambiguity situations, and excitement to work with non-software stakeholders directly.\n\n - Ability to work across the entire stack from deploying servers to writing front end code and everything in between (or demonstrated proficiency in one of these areas and the desire to expand your skillset).\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$80K – $160K • Offers Equity","scrapeableCompensationSalarySummary":"$80K - $160K","compensationTiers":[{"id":"7eb2f808-d97e-41cf-aa4f-205091b89126","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $80K – $160K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"2743b9e8-40c4-4348-8fef-95ede7552f0a","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"720540f4-6ab5-4063-944c-2064259e5495","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $80K – $160K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":80000,"maxValue":160000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":80000,"maxValue":160000}]}},{"id":"b646235d-3d25-42c7-b68b-31530a99b98f","title":"Senior Full Stack Software Engineer","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Moab, UT","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2025-10-07T01:27:07.870+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/b646235d-3d25-42c7-b68b-31530a99b98f","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/b646235d-3d25-42c7-b68b-31530a99b98f/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for an experienced Senior Full Stack Software Engineer to lead critical technical initiatives in building the next-generation critical minerals supply chain to support the world's energy transition.
As a Senior Full Stack Software Engineer at Mariana Minerals, you will architect, lead, and deliver software systems that accelerate the engineering and construction of physical infrastructure critical to building the minerals supply chain. You will drive technical strategy, mentor team members, and own end-to-end delivery of complex systems. Key responsibilities include designing and implementing robust integrations with existing engineering and construction software tools, architecting scalable solutions to address pain points identified by Mariana's internal teams, leading cross-functional collaboration with ML engineers to integrate LLMs for unstructured data challenges, and spearheading the development of a new \"operating system\" for the engineering, construction, and operation of Mariana's mineral processing facilities.
This is a truly full-stack role where you'll be expected to write production-quality frontend code while also demonstrating deep understanding of system design and backend architecture. You'll move seamlessly between user interfaces and distributed systems, ensuring excellence at every layer of the stack.
Lead the technical design and architecture of internal software tools, ensuring scalability, reliability, and maintainability while working closely with engineering, construction, and operations teams.
Architect and implement complex data integrations with enterprise engineering/construction tools such as Autodesk, establishing best practices for API design and data synchronization.
Drive the development of sophisticated web applications and platforms used by internal teams and partners, making key technical decisions on frameworks, infrastructure, and deployment strategies.
Conduct thorough technical evaluations of third-party software solutions, providing strategic recommendations on build-vs-buy decisions and integration approaches.
Lead cross-functional initiatives with ML engineers to design and implement production-ready ML, RL, and LLM-powered features, ensuring robust error handling and scalable architecture.
Mentor junior engineers, conduct code reviews, and establish engineering best practices across the team.
Participate in technical strategy discussions and contribute to long-term technology roadmap planning.
Own production reliability and performance optimization for critical systems.
5+ years of professional software engineering experience with a proven track record of delivering complex, production systems.
Deep expertise across the full stack, with demonstrated ability to make architectural decisions spanning frontend frameworks, backend services, databases, and cloud infrastructure.
Strong experience translating business requirements from non-technical stakeholders into robust technical solutions, with ability to communicate complex technical concepts clearly.
Proven leadership experience, whether through formal management, technical lead roles, or driving cross-functional initiatives.
Excellence in system design and architecture, with experience in distributed systems, microservices, and event-driven architectures.
Track record of working in ambiguous, fast-paced environments and bringing structure to complex technical challenges.
Experience with modern web frameworks (React/Vue), backend technologies (Node.js/Python/Go), and cloud platforms (AWS/GCP).
Strong understanding of DevOps practices, CI/CD pipelines, and infrastructure as code.
Experience with data engineering, ETL pipelines, or ML/AI integration is a plus.
Startup experience in a rapidly scaling company is helpful but not required.
Domain experience in manufacturing, industrial automation, or capital projects is beneficial but not required.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nMariana Minerals is looking for an experienced Senior Full Stack Software Engineer to lead critical technical initiatives in building the next-generation critical minerals supply chain to support the world's energy transition.\n\nAs a Senior Full Stack Software Engineer at Mariana Minerals, you will architect, lead, and deliver software systems that accelerate the engineering and construction of physical infrastructure critical to building the minerals supply chain. You will drive technical strategy, mentor team members, and own end-to-end delivery of complex systems. Key responsibilities include designing and implementing robust integrations with existing engineering and construction software tools, architecting scalable solutions to address pain points identified by Mariana's internal teams, leading cross-functional collaboration with ML engineers to integrate LLMs for unstructured data challenges, and spearheading the development of a new \"operating system\" for the engineering, construction, and operation of Mariana's mineral processing facilities.\n\nThis is a truly full-stack role where you'll be expected to write production-quality frontend code while also demonstrating deep understanding of system design and backend architecture. You'll move seamlessly between user interfaces and distributed systems, ensuring excellence at every layer of the stack.\n\n\n\n\nWHAT YOU'LL DO\n\n - Lead the technical design and architecture of internal software tools, ensuring scalability, reliability, and maintainability while working closely with engineering, construction, and operations teams.\n\n - Architect and implement complex data integrations with enterprise engineering/construction tools such as Autodesk, establishing best practices for API design and data synchronization.\n\n - Drive the development of sophisticated web applications and platforms used by internal teams and partners, making key technical decisions on frameworks, infrastructure, and deployment strategies.\n\n - Conduct thorough technical evaluations of third-party software solutions, providing strategic recommendations on build-vs-buy decisions and integration approaches.\n\n - Lead cross-functional initiatives with ML engineers to design and implement production-ready ML, RL, and LLM-powered features, ensuring robust error handling and scalable architecture.\n\n - Mentor junior engineers, conduct code reviews, and establish engineering best practices across the team.\n\n - Participate in technical strategy discussions and contribute to long-term technology roadmap planning.\n\n - Own production reliability and performance optimization for critical systems.\n\n\nWHAT YOU'LL BRING\n\n - 5+ years of professional software engineering experience with a proven track record of delivering complex, production systems.\n\n - Deep expertise across the full stack, with demonstrated ability to make architectural decisions spanning frontend frameworks, backend services, databases, and cloud infrastructure.\n\n - Strong experience translating business requirements from non-technical stakeholders into robust technical solutions, with ability to communicate complex technical concepts clearly.\n\n - Proven leadership experience, whether through formal management, technical lead roles, or driving cross-functional initiatives.\n\n - Excellence in system design and architecture, with experience in distributed systems, microservices, and event-driven architectures.\n\n - Track record of working in ambiguous, fast-paced environments and bringing structure to complex technical challenges.\n\n - Experience with modern web frameworks (React/Vue), backend technologies (Node.js/Python/Go), and cloud platforms (AWS/GCP).\n\n - Strong understanding of DevOps practices, CI/CD pipelines, and infrastructure as code.\n\n - Experience with data engineering, ETL pipelines, or ML/AI integration is a plus.\n\n - Startup experience in a rapidly scaling company is helpful but not required.\n\n - Domain experience in manufacturing, industrial automation, or capital projects is beneficial but not required.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $220K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $220K","compensationTiers":[{"id":"e7cff953-41e3-4097-a181-fb845d70d39c","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $150K – $220K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"93ef98c4-40e3-4640-89f7-22697a67ff22","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"5beec2cd-79f9-4a40-8f11-836088414ea0","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $150K – $220K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":220000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":220000}]}},{"id":"e431ba9d-8552-42b2-a566-86dcdc11c3e2","title":"Mine Planner ","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"San Francisco HQ","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}}},{"location":"Moab, UT","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}}}],"publishedAt":"2026-07-21T02:12:08.568+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/e431ba9d-8552-42b2-a566-86dcdc11c3e2","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/e431ba9d-8552-42b2-a566-86dcdc11c3e2/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for a highly motivated Senior Mine Planner to lead strategic mine planning, opportunity evaluation, and long-range optimization across the company’s portfolio of mining projects. This role is responsible for defining how mines are evaluated, designed, sequenced, and optimized—from early-stage concept evaluation through life-of-mine planning.
In this role, you will own long-range mine planning and multi-pit optimization efforts, setting the technical and analytical foundation for capital allocation, project prioritization, and development strategy. You will establish company-wide standards and best practices for short-, medium-, and long-term mine planning, ensuring consistency, rigor, and decision-quality across all assets.
This is a senior technical leadership role that sits at the intersection of geology, mine engineering, economics, and corporate strategy. You will influence what projects get built, how they are sequenced, and how value is maximized over time.
Strategic Opportunity Evaluation
Lead technical mine planning input for project screening, opportunity evaluation, and portfolio-level decision making
Develop high-level mine concepts, production profiles, and sequencing options to support investment, acquisition, and development decisions
Partner with geology, metallurgy, and commercial teams to evaluate trade-offs between scale, timing, risk, and value
Long-Range Mine Planning & Optimization
Own and develop long-range (LOM) mine plans that maximize NPV, operational flexibility, and strategic optionality
Perform multi-pit optimization, phase sequencing, and cutback strategy development across complex deposits
Evaluate alternative development strategies, mining rates, and sequencing scenarios to support robust decision making
Enterprise Planning Standards & Governance
Define and maintain company-wide standards, methodologies, and assumptions for short-, medium-, and long-term mine planning
Establish consistent approaches to mine design, scheduling, economic evaluation, and scenario analysis across all projects
Review and challenge mine plans produced by internal teams and external consultants to ensure technical rigor and alignment with company standards
Cross-Functional Integration
Work closely with geology, geotechnical, processing, infrastructure, and operations teams to ensure mine plans are fully integrated and technically sound
Translate long-range strategic plans into clear planning frameworks that downstream engineering and operations teams can execute against
Serve as the technical authority for mine planning decisions across the organization
Technical Leadership & Capability Building
Mentor and guide mine planners and engineers across the company, raising the overall quality and consistency of planning work
Contribute to the development of internal tools, templates, and workflows that improve planning efficiency and decision quality
Stay current on industry best practices, software, and optimization techniques, bringing new ideas into the organization
Bachelor’s degree in Mining Engineering or a closely related field (Master’s preferred)
5+ years of mine planning experience, with a strong emphasis on long-range planning, optimization, and strategic evaluation
Demonstrated expertise in pit optimization, phase design, sequencing, and economic trade-off analysis
Strong proficiency with modern mine planning and optimization tools (e.g., Deswik, Whittle, Vulcan, MinePlan, Leapfrog)
Experience evaluating complex, multi-pit or multi-deposit mining projects
Ability to think at both the technical and strategic level, connecting mine plans to capital decisions and long-term value creation
Strong communication skills and confidence operating as a senior technical authority
Experience working in fast-moving, project-driven or greenfield environments
Experience supporting early-stage studies (conceptual, PEA, PFS, FS) and corporate-level project evaluations
Professional Engineer (P.Eng or equivalent), or eligibility
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is looking for a highly motivated Senior Mine Planner to lead strategic mine planning, opportunity evaluation, and long-range optimization across the company’s portfolio of mining projects. This role is responsible for defining how mines are evaluated, designed, sequenced, and optimized—from early-stage concept evaluation through life-of-mine planning.\n\nIn this role, you will own long-range mine planning and multi-pit optimization efforts, setting the technical and analytical foundation for capital allocation, project prioritization, and development strategy. You will establish company-wide standards and best practices for short-, medium-, and long-term mine planning, ensuring consistency, rigor, and decision-quality across all assets.\n\nThis is a senior technical leadership role that sits at the intersection of geology, mine engineering, economics, and corporate strategy. You will influence what projects get built, how they are sequenced, and how value is maximized over time.\n\n\n\n\nWHAT YOU’LL DO\n\nStrategic Opportunity Evaluation\n\n - Lead technical mine planning input for project screening, opportunity evaluation, and portfolio-level decision making\n\n - Develop high-level mine concepts, production profiles, and sequencing options to support investment, acquisition, and development decisions\n\n - Partner with geology, metallurgy, and commercial teams to evaluate trade-offs between scale, timing, risk, and value\n\nLong-Range Mine Planning & Optimization\n\n - Own and develop long-range (LOM) mine plans that maximize NPV, operational flexibility, and strategic optionality\n\n - Perform multi-pit optimization, phase sequencing, and cutback strategy development across complex deposits\n\n - Evaluate alternative development strategies, mining rates, and sequencing scenarios to support robust decision making\n\nEnterprise Planning Standards & Governance\n\n - Define and maintain company-wide standards, methodologies, and assumptions for short-, medium-, and long-term mine planning\n\n - Establish consistent approaches to mine design, scheduling, economic evaluation, and scenario analysis across all projects\n\n - Review and challenge mine plans produced by internal teams and external consultants to ensure technical rigor and alignment with company standards\n\nCross-Functional Integration\n\n - Work closely with geology, geotechnical, processing, infrastructure, and operations teams to ensure mine plans are fully integrated and technically sound\n\n - Translate long-range strategic plans into clear planning frameworks that downstream engineering and operations teams can execute against\n\n - Serve as the technical authority for mine planning decisions across the organization\n\nTechnical Leadership & Capability Building\n\n - Mentor and guide mine planners and engineers across the company, raising the overall quality and consistency of planning work\n\n - Contribute to the development of internal tools, templates, and workflows that improve planning efficiency and decision quality\n\n - Stay current on industry best practices, software, and optimization techniques, bringing new ideas into the organization\n\n\n\n\nDESIRED QUALIFICATIONS\n\n - Bachelor’s degree in Mining Engineering or a closely related field (Master’s preferred)\n\n - 5+ years of mine planning experience, with a strong emphasis on long-range planning, optimization, and strategic evaluation\n\n - Demonstrated expertise in pit optimization, phase design, sequencing, and economic trade-off analysis\n\n - Strong proficiency with modern mine planning and optimization tools (e.g., Deswik, Whittle, Vulcan, MinePlan, Leapfrog)\n\n - Experience evaluating complex, multi-pit or multi-deposit mining projects\n\n - Ability to think at both the technical and strategic level, connecting mine plans to capital decisions and long-term value creation\n\n - Strong communication skills and confidence operating as a senior technical authority\n\n - Experience working in fast-moving, project-driven or greenfield environments\n\n - Experience supporting early-stage studies (conceptual, PEA, PFS, FS) and corporate-level project evaluations\n\n - Professional Engineer (P.Eng or equivalent), or eligibility\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $175K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $175K","compensationTiers":[{"id":"75c7f631-6049-452e-97e4-17c718cebda3","tierSummary":"Final salary based on skills and experience $140K – $175K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"325e4ad3-4ce5-4cc3-8945-295a5f4cf58b","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"61098cf0-19b8-4432-85a2-c23b26a70b7f","summary":"Final salary based on skills and experience $140K – $175K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000}]}},{"id":"71a58eed-e2d5-41b7-bb3d-8f6d0cdb8a89","title":"Lab Chemist","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-01T23:00:17.109+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/71a58eed-e2d5-41b7-bb3d-8f6d0cdb8a89","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/71a58eed-e2d5-41b7-bb3d-8f6d0cdb8a89/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are seeking a detail-oriented Analytical Lab Chemist to join our laboratory team. This senior-level role focuses on high-quality sample preparation and the execution of routine analytical testing. The ideal candidate is a disciplined scientist who prioritizes laboratory safety, is interested in hands-on analytical jobs, and possesses a foundational understanding of spectroscopic instrumentation and other chemical analysis equipment.
Safety & Compliance: Strictly adhere to all SOPs, chemical hygiene plans, and PPE requirements to maintain a safe working environment.
Lab Maintenance: willing to maintain a clean and organized workspace; manage chemical inventory and waste disposal according to regulatory standards.
Sample Preparation: Perform precise preparation of various sample matrices, including weighing, digestion, dilution, and filtration, ensuring zero cross-contamination.
Instrument Operation: Assist in the operation, calibration, and basic troubleshooting of analytical equipment.
Data Management: Accurately record experimental observations and raw data into Laboratory Information Management Systems (LIMS) or lab notebooks.
An associate/Bachelor’s degree in Chemistry, Biochemistry, or a closely related scientific field.
Demonstrated proficiency in wet chemistry techniques (pipetting, titration, acid digestion).
Familiarity with the principles of analytical instrumentation.
Hands-on experience or academic exposure to Titration, Flame AA, ICP-OES/MS, or XRF is desirable.
Knowledge of EPA, ISO, or GLP/GMP standards.
Soft Skills: Strong attention to detail, excellent time management, and a commitment to collaborative teamwork, and willing to learn new skills.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nPOSITION SUMMARY:\n\nWe are seeking a detail-oriented Analytical Lab Chemist to join our laboratory team. This senior-level role focuses on high-quality sample preparation and the execution of routine analytical testing. The ideal candidate is a disciplined scientist who prioritizes laboratory safety, is interested in hands-on analytical jobs, and possesses a foundational understanding of spectroscopic instrumentation and other chemical analysis equipment.\n\n \n\n\nKEY RESPONSIBILITIES:\n\n - Safety & Compliance: Strictly adhere to all SOPs, chemical hygiene plans, and PPE requirements to maintain a safe working environment.\n\n - Lab Maintenance: willing to maintain a clean and organized workspace; manage chemical inventory and waste disposal according to regulatory standards.\n\n - Sample Preparation: Perform precise preparation of various sample matrices, including weighing, digestion, dilution, and filtration, ensuring zero cross-contamination.\n\n - Instrument Operation: Assist in the operation, calibration, and basic troubleshooting of analytical equipment.\n\n - Data Management: Accurately record experimental observations and raw data into Laboratory Information Management Systems (LIMS) or lab notebooks.\n\n\nREQUIRED QUALIFICATIONS:\n\n - An associate/Bachelor’s degree in Chemistry, Biochemistry, or a closely related scientific field.\n\n - Demonstrated proficiency in wet chemistry techniques (pipetting, titration, acid digestion).\n\n - Familiarity with the principles of analytical instrumentation.\n\n - Hands-on experience or academic exposure to Titration, Flame AA, ICP-OES/MS, or XRF is desirable.\n\n - Knowledge of EPA, ISO, or GLP/GMP standards.\n\n - Soft Skills: Strong attention to detail, excellent time management, and a commitment to collaborative teamwork, and willing to learn new skills.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"54b3a115-b569-48ed-a483-f97caf6e7757","title":"Staff Process Engineer ","department":"Process Development","team":"Process Development","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-03-24T17:14:53.581+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/54b3a115-b569-48ed-a483-f97caf6e7757","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/54b3a115-b569-48ed-a483-f97caf6e7757/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is seeking a highly motivated Process Engineer to support our next-generation minerals processing pilot plant in Houston. You will help design, deploy, and operate first-of-its-kind refining processes for critical minerals. This role is highly hands-on and will play a key role in bridging R&D and plant operations, helping scale technologies from laboratory development through pilot demonstration and ultimately to commercial production. You will work closely with technicians, engineers, and cross-functional teams to ensure processes are robust, safe, and ready for industrial deployment.
Lead equipment and process design from concept through procurement, fabrication, installation, commissioning, and startup
Operate, troubleshoot, and improve pilot-scale processing equipment in collaboration with pilot plant technicians
Design and execute pilot-scale experiments to evaluate process performance, recovery, throughput, and product quality
Develop and maintain key process documentation including PFDs, P&IDs, mass and heat balances, operating procedures, and control narratives
Analyze experimental and operational data to identify opportunities for process optimization and scale-up
Support development of automated plant monitoring and optimization tools in collaboration with software and machine learning teams
Ensure safe operations by supporting EHS, hazard assessments, risk management, and management of change processes
B.S., M.S., or PhD in Chemical Engineering or a related field
10+ years of experience in operations, process scale-up, or plant design in minerals processing, chemicals, specialty materials, oil & gas, or related industries
Demonstrated experience driving equipment design, commissioning, and plant operation
Strong understanding of relevant unit operations and equipment such as kilns, furnaces, ion exchange, solvent extraction, solid liquid separation, leaching, electrowinning, or similar technologies
Ability to design experiments, troubleshoot complex processes, and analyze operational datasets
Strong commitment to Health, Safety, and Environmental compliance
Excellent technical writing, communication, and teamwork skills
Comfortable working in fast-paced environments, wearing multiple hats, and managing ambiguity
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is seeking a highly motivated Process Engineer to support our next-generation minerals processing pilot plant in Houston. You will help design, deploy, and operate first-of-its-kind refining processes for critical minerals. This role is highly hands-on and will play a key role in bridging R&D and plant operations, helping scale technologies from laboratory development through pilot demonstration and ultimately to commercial production. You will work closely with technicians, engineers, and cross-functional teams to ensure processes are robust, safe, and ready for industrial deployment.\n\n\n\n\nWHAT YOU’LL DO\n\n - Lead equipment and process design from concept through procurement, fabrication, installation, commissioning, and startup\n\n - Operate, troubleshoot, and improve pilot-scale processing equipment in collaboration with pilot plant technicians\n\n - Design and execute pilot-scale experiments to evaluate process performance, recovery, throughput, and product quality\n\n - Develop and maintain key process documentation including PFDs, P&IDs, mass and heat balances, operating procedures, and control narratives\n\n - Analyze experimental and operational data to identify opportunities for process optimization and scale-up\n\n - Support development of automated plant monitoring and optimization tools in collaboration with software and machine learning teams\n\n - Ensure safe operations by supporting EHS, hazard assessments, risk management, and management of change processes\n \n \n\n\nWHAT YOU'LL BRING\n\n - B.S., M.S., or PhD in Chemical Engineering or a related field\n\n - 10+ years of experience in operations, process scale-up, or plant design in minerals processing, chemicals, specialty materials, oil & gas, or related industries\n\n - Demonstrated experience driving equipment design, commissioning, and plant operation\n\n - Strong understanding of relevant unit operations and equipment such as kilns, furnaces, ion exchange, solvent extraction, solid liquid separation, leaching, electrowinning, or similar technologies\n\n - Ability to design experiments, troubleshoot complex processes, and analyze operational datasets\n\n - Strong commitment to Health, Safety, and Environmental compliance\n\n - Excellent technical writing, communication, and teamwork skills\n\n - Comfortable working in fast-paced environments, wearing multiple hats, and managing ambiguity\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $175K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $175K","compensationTiers":[{"id":"dbb5ec7a-3779-41d6-8078-7180342d5c0c","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $175K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"32713f78-fdc3-4f22-8cb4-d07e0a5d1bfb","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $175K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000},{"id":"d99a9bd5-5067-4e4a-8045-43df6c238806","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"036f4673-06ee-483b-9a50-22e32139a423","title":"IT Technician","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-03-24T14:21:57.716+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/036f4673-06ee-483b-9a50-22e32139a423","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/036f4673-06ee-483b-9a50-22e32139a423/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
The IT Technician will provide onsite technical support at a remote mine site, ensuring the reliability, security, and performance of all technology systems that support mining operations. This role supports endusers, network infrastructure, hardware, software, communication systems, and operational technology (OT) used in the field. The technician will troubleshoot issues, perform maintenance, manage equipment inventory, and work closely with the corporate IT team to maintain compliance with company standards.
What You’ll Do
Technical Support & Troubleshooting
Provide onsite support for desktops, laptops, tablets, mobile devices, printers, and specialized mining equipment interfaces.
Diagnose and resolve hardware, software, and network issues in a highdemand, fastpaced environment.
Assist with installation, configuration, and updates of operating systems and applications.
Support minesite users with connectivity issues, authentication, VPN access, and account management.
Network & Infrastructure Support
Maintain network equipment including switches, access points, routers, and fiber/copper connections.
Monitor system performance and escalate issues as needed.
Assist with maintaining reliable communication systems, including VoIP, radios, and industrial wireless networks used in mining operations.
Operations Technology (OT) Support
Support field equipment such as rugged tablets, PLC interfaces, fleetmanagement hardware, and sensors used for production, dispatch, and safety monitoring.
Collaborate with engineering and operations teams to ensure reliable data flow between equipment and central systems.
Equipment Management
Maintain accurate inventories of IT hardware and consumables.
Prepare and deploy new equipment according to company standards.
Perform routine preventive maintenance on devices and communication infrastructure.
Compliance, Security & Safety
Follow all minesite safety protocols and participate in safety meetings and training.
Adhere to cybersecurity policies, ensuring secure configuration and proper user practices.
Support implementation of patches, updates, and security controls across all site systems.
Documentation & Reporting
Maintain detailed logs of incidents, resolutions, and system performance.
Update configuration records and asset documentation.
Provide regular status updates to IT leadership and site management.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nThe IT Technician will provide onsite technical support at a remote mine site, ensuring the reliability, security, and performance of all technology systems that support mining operations. This role supports endusers, network infrastructure, hardware, software, communication systems, and operational technology (OT) used in the field. The technician will troubleshoot issues, perform maintenance, manage equipment inventory, and work closely with the corporate IT team to maintain compliance with company standards.\n\n\n\nWhat You’ll Do\n\nTechnical Support & Troubleshooting\n\n - Provide onsite support for desktops, laptops, tablets, mobile devices, printers, and specialized mining equipment interfaces.\n\n - Diagnose and resolve hardware, software, and network issues in a highdemand, fastpaced environment.\n\n - Assist with installation, configuration, and updates of operating systems and applications.\n\n - Support minesite users with connectivity issues, authentication, VPN access, and account management.\n\nNetwork & Infrastructure Support\n\n - Maintain network equipment including switches, access points, routers, and fiber/copper connections.\n\n - Monitor system performance and escalate issues as needed.\n\n - Assist with maintaining reliable communication systems, including VoIP, radios, and industrial wireless networks used in mining operations.\n\nOperations Technology (OT) Support\n\n - Support field equipment such as rugged tablets, PLC interfaces, fleetmanagement hardware, and sensors used for production, dispatch, and safety monitoring.\n\n - Collaborate with engineering and operations teams to ensure reliable data flow between equipment and central systems.\n\nEquipment Management\n\n - Maintain accurate inventories of IT hardware and consumables.\n\n - Prepare and deploy new equipment according to company standards.\n\n - Perform routine preventive maintenance on devices and communication infrastructure.\n\nCompliance, Security & Safety\n\n - Follow all minesite safety protocols and participate in safety meetings and training.\n\n - Adhere to cybersecurity policies, ensuring secure configuration and proper user practices.\n\n - Support implementation of patches, updates, and security controls across all site systems.\n\nDocumentation & Reporting\n\n - Maintain detailed logs of incidents, resolutions, and system performance.\n\n - Update configuration records and asset documentation.\n\n - Provide regular status updates to IT leadership and site management.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"34229014-6dac-4c17-afe1-d120206b1c46","title":"Sr. Site Development Engineer","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-04-03T16:59:39.931+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/34229014-6dac-4c17-afe1-d120206b1c46","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/34229014-6dac-4c17-afe1-d120206b1c46/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is seeking a highly motivated Sr. Site Development Engineer to lead the planning and design of greenfield project sites. In this role, you will be responsible for end-to-end site development—from early-stage site selection and feasibility through detailed engineering and construction execution—for first-of-its-kind mining and metallurgical processing facilities. You will work cross-functionally across engineering, construction, and project delivery teams to ensure sites are designed for constructability, scalability, and long-term operational performance. You will lead civil, grading, drainage, utilities, and site infrastructure design, manage external engineering partners, and support the development of internal tools and workflows for efficient capital project execution.
Develop and optimize site layouts, including grading, drainage, stormwater management, access roads, and utility corridors
Drive early-stage site selection, feasibility studies, and due diligence, including topography, geotechnical constraints, permitting considerations, and infrastructure access
Design and review earthwork plans, cut/fill balancing, and mass grading strategies to optimize cost and constructability
Coordinate site infrastructure systems including roads, drainage, underground utilities, and tie-ins to external infrastructure
Manage and coordinate external engineering firms, consultants, and contractors supporting civil and site development scopes
Oversee development of issued-for-construction (IFC) packages for site civil works
Collaborate with structural, process, mechanical, and electrical teams to ensure integrated and efficient site design
Review and validate 3D models and design packages (Civil 3D, Revit, Navisworks) for site and infrastructure systems
Conduct constructability reviews and support cost estimation and scheduling for site development scopes
Support permitting and regulatory approvals, including grading permits, stormwater compliance, and environmental considerations
Provide field engineering support during construction, resolving site-related issues in real time
Develop and improve standards, workflows, and tools for scalable site development across multiple projects
Bachelor’s degree in Civil Engineering (Master’s degree preferred)
10+ years of experience in site development and civil engineering for industrial, mining, or large-scale infrastructure projects
Proven experience delivering greenfield capital projects from concept through construction
Professional Engineer (PE) license or ability to obtain within 6 months (preferred)
Technical Expertise
Site grading and drainage design
Earthwork optimization and mass balance
Stormwater management and hydrology/hydraulics
Roadway and access design
Underground utilities and infrastructure systems
Working knowledge of geotechnical principles and site constraints
Familiarity with permitting and regulatory requirements for site development
Proficiency with:
Civil 3D (required)
AutoCAD, Revit, Navisworks, Bluebeam
Experience reviewing and coordinating 3D design models and multidisciplinary layouts
Experience coordinating across civil, structural, process, mechanical, and electrical teams
Strong track record managing external engineering firms and contractors
Ability to operate in a fast-paced, cross-functional environment with evolving project
Industry Experience (Preferred)
Industrial manufacturing
Mining or mineral processing
Chemical or process facilities
Engineering, procurement, and construction (EPC) environments
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is seeking a highly motivated Sr. Site Development Engineer to lead the planning and design of greenfield project sites. In this role, you will be responsible for end-to-end site development—from early-stage site selection and feasibility through detailed engineering and construction execution—for first-of-its-kind mining and metallurgical processing facilities. You will work cross-functionally across engineering, construction, and project delivery teams to ensure sites are designed for constructability, scalability, and long-term operational performance. You will lead civil, grading, drainage, utilities, and site infrastructure design, manage external engineering partners, and support the development of internal tools and workflows for efficient capital project execution.\n\n\n\n\nWHAT YOU’LL DO\n\n - Develop and optimize site layouts, including grading, drainage, stormwater management, access roads, and utility corridors\n\n - Drive early-stage site selection, feasibility studies, and due diligence, including topography, geotechnical constraints, permitting considerations, and infrastructure access\n\n - Design and review earthwork plans, cut/fill balancing, and mass grading strategies to optimize cost and constructability\n\n - Coordinate site infrastructure systems including roads, drainage, underground utilities, and tie-ins to external infrastructure\n\n - Manage and coordinate external engineering firms, consultants, and contractors supporting civil and site development scopes\n\n - Oversee development of issued-for-construction (IFC) packages for site civil works\n\n - Collaborate with structural, process, mechanical, and electrical teams to ensure integrated and efficient site design\n\n - Review and validate 3D models and design packages (Civil 3D, Revit, Navisworks) for site and infrastructure systems\n\n - Conduct constructability reviews and support cost estimation and scheduling for site development scopes\n\n - Support permitting and regulatory approvals, including grading permits, stormwater compliance, and environmental considerations\n\n - Provide field engineering support during construction, resolving site-related issues in real time\n\n - Develop and improve standards, workflows, and tools for scalable site development across multiple projects\n\n\n\n\nWHAT YOU’LL BRING\n\n - Bachelor’s degree in Civil Engineering (Master’s degree preferred)\n\n - 10+ years of experience in site development and civil engineering for industrial, mining, or large-scale infrastructure projects\n\n - Proven experience delivering greenfield capital projects from concept through construction\n\n - Professional Engineer (PE) license or ability to obtain within 6 months (preferred)\n\n - Technical Expertise\n \n - Site grading and drainage design\n \n - Earthwork optimization and mass balance\n \n - Stormwater management and hydrology/hydraulics\n \n - Roadway and access design\n \n - Underground utilities and infrastructure systems\n \n - Working knowledge of geotechnical principles and site constraints\n \n - Familiarity with permitting and regulatory requirements for site development\n\n - Proficiency with:\n \n - Civil 3D (required)\n \n - AutoCAD, Revit, Navisworks, Bluebeam\n \n - Experience reviewing and coordinating 3D design models and multidisciplinary layouts\n\n - Experience coordinating across civil, structural, process, mechanical, and electrical teams\n\n - Strong track record managing external engineering firms and contractors\n\n - Ability to operate in a fast-paced, cross-functional environment with evolving project\n\n - Industry Experience (Preferred)\n \n - Industrial manufacturing\n \n - Mining or mineral processing\n \n - Chemical or process facilities\n \n - Engineering, procurement, and construction (EPC) environments\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $200K","compensationTiers":[{"id":"7a2c24a6-18db-4eb1-8946-f1477f44aad6","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors: $150K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"824877a1-db38-4cbf-9fae-8dd53f302aeb","summary":"Estimated Base Salary, final salary based on experience, location, and other factors: $150K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"id":"ed7e39bb-75cd-4155-a5b9-29da99c83549","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"f0ed5b09-3b8d-4f55-a786-9a2cb9e60907","title":"Engineering Design Manager","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"San Francisco HQ","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}}}],"publishedAt":"2026-04-24T21:38:19.149+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/f0ed5b09-3b8d-4f55-a786-9a2cb9e60907","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/f0ed5b09-3b8d-4f55-a786-9a2cb9e60907/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is looking for a highly motivated Design Manager to work on building the critical minerals supply chain to support the world’s energy transition.
In this role, you will manage design, tasks, and the flow of information across internal and external engineering teams for your assigned project(s), primarily during the Detail Engineering phase of project execution. You will develop and maintain project workflows, lead project-specific design activities, support document control processes, manage engineering deliverables, coordinate cross-discipline reviews, manage approvals, and provide progress updates.
What You’ll Do
Take a hands-on approach leading the detail design of industrial facilities – especially minerals processing plants – with responsibility for integrated technical design and engineering execution.
Manage engineering activities across internal engineering teams, external engineering partners, and vendors.
Assist in building and improving digital project-execution tools, applying your expertise to the development of tools that help us deliver projects.
Coordinate cross-discipline engineering reviews, ensuring timely engagement from process, mechanical, structural, piping, electrical, instrumentation, and construction teams.
Lead technical interface management, resolving gaps and issues between disciplines, vendors, and EPC partners.
Own and lead by example on project performance for cost and schedule, managed against established metrics.
Build and maintain strategic relationships with external partners, vendors, and contractors.
Support resolution of technical issues arising during fabrication and construction phases.
Lead safety in design, including the consistent implementation of policies, procedures, and external best practices.
Ensure compliance with applicable regulatory requirements and industry codes and standards.
Prepare project status reports communicating overall progress, major issues, and mitigation plans.
Manage review/approval workflows for engineering documents, vendor submittals, and project deliverables.
Track engineering deliverables and action items, maintaining up-to-date logs, trackers, and registers to ensure alignment with the project schedule.
What You’ll Bring
Bachelor’s degree in engineering (mechanical, civil, chemical, or related discipline).
7–15+ years of relevant experience in project engineering, project management, EPC/EPCM environments, or industrial project engineering roles.
Familiarity with engineering project workflows, including planning, risk management, document control, design reviews, RFI management, and vendor coordination.
Strong communication and coordination skills, with the ability to interface across disciplines and follow up effectively with teammates and external partners.
Ability to work in a fast-paced, first-principles-oriented environment, managing competing priorities under schedule pressure.
Familiarity with applicable industry codes and standards.
Strong competencies in accountability, organizational skills, problem-solving, self-motivation, and professionalism across internal and external stakeholders.
Preferred
Multi-disciplinary experience across mechanical, piping, civil, structural, instrumentation, controls, architecture, and safety.
Extensive experience collaborating with Construction, Operations, and Maintenance teams to ensure designs are safe and fit-for-purpose.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role \n\nMariana Minerals is looking for a highly motivated Design Manager to work on building the critical minerals supply chain to support the world’s energy transition.\n\nIn this role, you will manage design, tasks, and the flow of information across internal and external engineering teams for your assigned project(s), primarily during the Detail Engineering phase of project execution. You will develop and maintain project workflows, lead project-specific design activities, support document control processes, manage engineering deliverables, coordinate cross-discipline reviews, manage approvals, and provide progress updates.\n\nWhat You’ll Do\n\n - Take a hands-on approach leading the detail design of industrial facilities – especially minerals processing plants – with responsibility for integrated technical design and engineering execution.\n\n - Manage engineering activities across internal engineering teams, external engineering partners, and vendors.\n\n - Assist in building and improving digital project-execution tools, applying your expertise to the development of tools that help us deliver projects.\n\n - Coordinate cross-discipline engineering reviews, ensuring timely engagement from process, mechanical, structural, piping, electrical, instrumentation, and construction teams.\n\n - Lead technical interface management, resolving gaps and issues between disciplines, vendors, and EPC partners.\n\n - Own and lead by example on project performance for cost and schedule, managed against established metrics.\n\n - Build and maintain strategic relationships with external partners, vendors, and contractors.\n\n - Support resolution of technical issues arising during fabrication and construction phases.\n\n - Lead safety in design, including the consistent implementation of policies, procedures, and external best practices.\n\n - Ensure compliance with applicable regulatory requirements and industry codes and standards.\n\n - Prepare project status reports communicating overall progress, major issues, and mitigation plans.\n\n - Manage review/approval workflows for engineering documents, vendor submittals, and project deliverables.\n\n - Track engineering deliverables and action items, maintaining up-to-date logs, trackers, and registers to ensure alignment with the project schedule.\n\nWhat You’ll Bring\n\n - Bachelor’s degree in engineering (mechanical, civil, chemical, or related discipline).\n\n - 7–15+ years of relevant experience in project engineering, project management, EPC/EPCM environments, or industrial project engineering roles.\n\n - Familiarity with engineering project workflows, including planning, risk management, document control, design reviews, RFI management, and vendor coordination.\n\n - Strong communication and coordination skills, with the ability to interface across disciplines and follow up effectively with teammates and external partners.\n\n - Ability to work in a fast-paced, first-principles-oriented environment, managing competing priorities under schedule pressure.\n\n - Familiarity with applicable industry codes and standards.\n\n - Strong competencies in accountability, organizational skills, problem-solving, self-motivation, and professionalism across internal and external stakeholders.\n\nPreferred\n\n - Multi-disciplinary experience across mechanical, piping, civil, structural, instrumentation, controls, architecture, and safety.\n\n - Extensive experience collaborating with Construction, Operations, and Maintenance teams to ensure designs are safe and fit-for-purpose.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$100K – $200K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors","scrapeableCompensationSalarySummary":"$100K - $200K","compensationTiers":[{"id":"d5baafa8-c63c-4493-96b3-13602b34e380","tierSummary":"$100K – $200K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors","components":[{"id":"8b147c13-ad17-42bf-a2dc-a46338e17534","summary":"$100K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":200000},{"id":"be4251f9-99c9-4e9e-941b-48124a0ed4c0","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":200000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"76c24ff0-cdff-4d57-a204-f8f387830c01","title":"Sr. Estimator","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-07-31T22:32:22.904+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/76c24ff0-cdff-4d57-a204-f8f387830c01","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/76c24ff0-cdff-4d57-a204-f8f387830c01/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is seeking an experienced and detail-oriented Sr. Estimator to lead cost estimation efforts for mining and mineral processing projects. This role is responsible for developing accurate, competitive, and timely cost estimates that support strategic decision-making and project success.
Lead the preparation of detailed cost estimates for mining, processing, and infrastructure projects
Analyze drawings, specifications, proposals, and other documentation to prepare time, cost, materials, and labor estimate
Utilize RSMeans data and tools to develop accurate and benchmarked cost estimates
Collaborate with engineering, procurement, and project management teams to ensure accurate and comprehensive estimate
Develop and maintain cost databases, benchmarks, and estimating tools
Identify project risks and opportunities, providing mitigation strategies
Review and validate subcontractor and supplier quotes
Participate in bid reviews, value engineering, and project planning sessions
Provide ongoing cost analysis and support throughout the project lifecycle
Mentor junior estimators and contribute to continuous improvement initiatives
Support the PCM and Software Engineering teams in developing operating systems and tools to automate estimating processes
7+ years of experience in estimating within mining, heavy industrial, or construction environments
Strong knowledge of mining operations, materials, and equipment
Proficiency in RSMeans
Advanced skills in Excel and data analysis
Ability to interpret technical drawings and specifications
Strong analytical, organizational, and communication skills
Availability to travel 20% of the time to site or Mariana Minerals offices
Experience with EPC/EPCM project delivery models
Familiarity with mining projects
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nMariana Minerals is seeking an experienced and detail-oriented Sr. Estimator to lead cost estimation efforts for mining and mineral processing projects. This role is responsible for developing accurate, competitive, and timely cost estimates that support strategic decision-making and project success.\n\n\n\n\nWHAT YOU’LL DO\n\n - Lead the preparation of detailed cost estimates for mining, processing, and infrastructure projects\n\n - Analyze drawings, specifications, proposals, and other documentation to prepare time, cost, materials, and labor estimate\n\n - Utilize RSMeans data and tools to develop accurate and benchmarked cost estimates\n\n - Collaborate with engineering, procurement, and project management teams to ensure accurate and comprehensive estimate\n\n - Develop and maintain cost databases, benchmarks, and estimating tools\n\n - Identify project risks and opportunities, providing mitigation strategies\n\n - Review and validate subcontractor and supplier quotes\n\n - Participate in bid reviews, value engineering, and project planning sessions\n\n - Provide ongoing cost analysis and support throughout the project lifecycle\n\n - Mentor junior estimators and contribute to continuous improvement initiatives\n\n - Support the PCM and Software Engineering teams in developing operating systems and tools to automate estimating processes\n\n \n\n\nWHAT YOU’LL BRING\n\n - 7+ years of experience in estimating within mining, heavy industrial, or construction environments\n\n - Strong knowledge of mining operations, materials, and equipment\n\n - Proficiency in RSMeans\n\n - Advanced skills in Excel and data analysis\n\n - Ability to interpret technical drawings and specifications\n\n - Strong analytical, organizational, and communication skills\n\n - Availability to travel 20% of the time to site or Mariana Minerals offices\n\n \n\n\nPREFERRED \n\n - Experience with EPC/EPCM project delivery models\n\n - Familiarity with mining projects\n\n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"5311bff2-7700-41fa-bac1-996eb717b2f6","title":"Staff Product Manager","department":"Product Development","team":"Product Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-06-23T17:09:35.726+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/5311bff2-7700-41fa-bac1-996eb717b2f6","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/5311bff2-7700-41fa-bac1-996eb717b2f6/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We’re hiring a Staff Product Manager to own a critical domain within MarianaOS. This is a single posting because we recruit for the strongest PMs first and then place them where the fit is best. Through the interview process, we’ll figure out together which part of the system is the right match for your background and instincts.
The scope of what we can touch is enormous. Mining is the last major industrial sector that hasn’t been rebuilt with modern software. The opportunity set isn’t a feature gap on an existing product — it’s entire workflows and systems that don’t exist yet. The problem space spans micron-scale chemistry to kilometer-scale infrastructure.
Ship a feature and you can watch the needle move — recovery rates, reagent consumption, construction timelines, equipment uptime. These aren’t proxy metrics. They’re the actual physics of making metal.
MarianaOS is the digital nervous system for mineral projects. It spans the full lifecycle — from capital project execution through autonomous operations. The four domains we are staffing for right now are:
PlantOS
Our autonomy platform for mineral processing — lithium refining, SX-EW, flotation, copper recycling and beyond. It uses the same reinforcement learning toolkit powering self-driving vehicles and humanoid robots, except we’re using it for autonomous control of minerals refining circuits.
MineOS
Integrates geologic block models, short and long-range mine plans, fleet management systems, and industrial control systems into a single optimization layer. We’re accelerating autonomous fleet deployment and building an accurate digital twin of the site to maximize the lifetime value of the mine.
CapitalProjectOS
The integrated operating system that lets Mariana build in half the time, at half the cost — and deliver 10+ projects over the next decade. Fragmented data and spreadsheet-driven coordination are replaced by a unified environment for project deliverables, data and workflows which drives visibility, traceability, rapid decision-making and AI-driven execution.
AssetOS
Everything we do at Mariana involves tracking and maintaining physical assets across their lifecycle. The assets we design in CapitalProjectOS, can only be used to their full potential by mine and plantOS if we can keep them in service. That’s where AssetOS fits, this OS supports a world-class maintenance function that turns every PM into an F1-style pit stop.
Own a product domain end-to-end — from uncovering the right problems and setting the strategy and roadmap through shipping software that runs in real operations where consequences are physical and feedback is immediate
Define what to build by analyzing performance data and talking to domain experts — including figuring out what metrics and instrumentation need to exist in the first place
Spend meaningful time at construction sites, processing facilities, and mines to understand how work actually happens — prioritization comes from deep operational knowledge, not market research
Work at the intersection of hardware, software, and AI — translating what models can do into what operators will trust, and what robotics can deliver into what sites need
Drive clarity in ambiguous situations: break down complex problems, define scope, make tradeoffs explicit, and keep teams focused on what matters most
Help build the PM function — this is a small, early PM team where you’ll help establish how we work, how we prioritize, and how we develop PMs behind you
We’ve seen two profiles excel in this kind of environment. You likely see yourself in one of these:
The AI-Forward PM
You’ve worked with ML and AI in production — agents, reinforcement learning, process control, optimization. You know how to bridge the gap between what a model can do and what an end user will actually trust. You’ve translated research into shipped products in high-stakes environments.
The Autonomy-Forward PM
You’ve shipped products where hardware and software meet and where software failure has physical consequences. You think in fleet coordination, sensor fusion, and operational reliability. You may have started as an engineer and moved into product because you wanted to own the outcome, not just the component.
Technical Generalist
You have strong PM fundamentals, are technically deep and have worked in complex, data intensive environments. You operate well in high ambiguity environments and earned trust of engineers. You don’t start on day one with all the domain expertise needed, but rapid learn and soon own outcomes.
Don’t fit neatly into one of these?
We’re also drawn to people with strong PM fundamentals who’ve operated in complex, high-ambiguity environments — or people from industrial backgrounds (manufacturing, energy, construction, logistics) who have genuine product instincts even if “PM” has never been in your title.
Must Have
7+ years of experience in product management, ideally with meaningful time in environments where software intersects with physical systems, industrial operations, or safety-critical applications.
Demonstrated ability to understand users and their problems, prioritize systematically, set clear metrics and deliver products which deliver impact at scale.
Clear and concise communicator; you connect across a huge range of technical literacy from PhD engineers and scientists to field operators with no software background
Demonstrated ability to go deep on technical domains and build credibility with engineers.
Experience leading cross-functional teams through ambiguous, complex projects with competing constraints
Intellectual curiosity. You want to understand how the domain works, not treat it as a black box
Experimentation and growth mindset / desire and ability to learn. Software development and product management has and will continue to change; you are excited to apply the latest and greatest technology and techniques to improve Mariana and the product management team.
High agency. You own the outcome.
Nice to Have
Experience with autonomous systems, robotics, or fleet-scale operations
Has been part of a team delivering capital projects of meaningful scale as part of engineering, procurement, project management, construction or other functions
Hands-on work with ML-powered products — especially RL, process control, or optimization in production settings
Background in industrial software, digital twin systems, or process automation
Track record of digital transformation work in traditional industries
An engineering or technical degree (not required, but the instincts it builds are valued)
Most senior PM roles are narrowly scoped — you own one product, one feature set, one customer segment. This role is different.
At Mariana, you don’t need to validate product-market fit because we are the market. If you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle. The constraint is building the right thing, not convincing someone to buy it.
The number and diversity of problems is unusual: you might work across agentic LLM systems for engineering workflows, RL-based process control, and autonomous fleet optimization in the same quarter.
This is not SaaS. This is software that runs mines and refineries. If you’re a strong PM looking for something more substantive than another enterprise software product, we’d love to talk.
Things move fast. The distance between “we should build this” and “it’s running in a real facility” is short — and you’ll feel that pace. You’ll work with an unusually diverse set of collaborators: geologists, metallurgists, chemical engineers, construction managers, plant operators, ML engineers, and software developers. There’s no translation layer between you and the domain experts. They’re your direct collaborators.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe’re hiring a Staff Product Manager to own a critical domain within MarianaOS. This is a single posting because we recruit for the strongest PMs first and then place them where the fit is best. Through the interview process, we’ll figure out together which part of the system is the right match for your background and instincts.\n\nThe scope of what we can touch is enormous. Mining is the last major industrial sector that hasn’t been rebuilt with modern software. The opportunity set isn’t a feature gap on an existing product — it’s entire workflows and systems that don’t exist yet. The problem space spans micron-scale chemistry to kilometer-scale infrastructure.\n\nShip a feature and you can watch the needle move — recovery rates, reagent consumption, construction timelines, equipment uptime. These aren’t proxy metrics. They’re the actual physics of making metal.\n\n\n\n\nTHE PLATFORM: MARIANAOS\n\nMarianaOS is the digital nervous system for mineral projects. It spans the full lifecycle — from capital project execution through autonomous operations. The four domains we are staffing for right now are:\n\n - PlantOS\n\nOur autonomy platform for mineral processing — lithium refining, SX-EW, flotation, copper recycling and beyond. It uses the same reinforcement learning toolkit powering self-driving vehicles and humanoid robots, except we’re using it for autonomous control of minerals refining circuits.\n\n - MineOS\n\nIntegrates geologic block models, short and long-range mine plans, fleet management systems, and industrial control systems into a single optimization layer. We’re accelerating autonomous fleet deployment and building an accurate digital twin of the site to maximize the lifetime value of the mine.\n\n - CapitalProjectOS\n\nThe integrated operating system that lets Mariana build in half the time, at half the cost — and deliver 10+ projects over the next decade. Fragmented data and spreadsheet-driven coordination are replaced by a unified environment for project deliverables, data and workflows which drives visibility, traceability, rapid decision-making and AI-driven execution.\n\n - AssetOS\n\nEverything we do at Mariana involves tracking and maintaining physical assets across their lifecycle. The assets we design in CapitalProjectOS, can only be used to their full potential by mine and plantOS if we can keep them in service. That’s where AssetOS fits, this OS supports a world-class maintenance function that turns every PM into an F1-style pit stop.\n\n\n\n\nWHAT YOU’LL DO\n\n - Own a product domain end-to-end — from uncovering the right problems and setting the strategy and roadmap through shipping software that runs in real operations where consequences are physical and feedback is immediate\n\n - Define what to build by analyzing performance data and talking to domain experts — including figuring out what metrics and instrumentation need to exist in the first place\n\n - Spend meaningful time at construction sites, processing facilities, and mines to understand how work actually happens — prioritization comes from deep operational knowledge, not market research\n\n - Work at the intersection of hardware, software, and AI — translating what models can do into what operators will trust, and what robotics can deliver into what sites need\n\n - Drive clarity in ambiguous situations: break down complex problems, define scope, make tradeoffs explicit, and keep teams focused on what matters most\n\n - Help build the PM function — this is a small, early PM team where you’ll help establish how we work, how we prioritize, and how we develop PMs behind you\n \n \n\n\nWHO THRIVES HERE\n\nWe’ve seen two profiles excel in this kind of environment. You likely see yourself in one of these:\n\n - The AI-Forward PM\n \n You’ve worked with ML and AI in production — agents, reinforcement learning, process control, optimization. You know how to bridge the gap between what a model can do and what an end user will actually trust. You’ve translated research into shipped products in high-stakes environments.\n\n - The Autonomy-Forward PM\n \n You’ve shipped products where hardware and software meet and where software failure has physical consequences. You think in fleet coordination, sensor fusion, and operational reliability. You may have started as an engineer and moved into product because you wanted to own the outcome, not just the component.\n\n - Technical Generalist\n \n You have strong PM fundamentals, are technically deep and have worked in complex, data intensive environments. You operate well in high ambiguity environments and earned trust of engineers. You don’t start on day one with all the domain expertise needed, but rapid learn and soon own outcomes.\n\n - Don’t fit neatly into one of these?\n\nWe’re also drawn to people with strong PM fundamentals who’ve operated in complex, high-ambiguity environments — or people from industrial backgrounds (manufacturing, energy, construction, logistics) who have genuine product instincts even if “PM” has never been in your title. \n\n\n\n\nDESIRED QUALIFICATIONS\n\nMust Have\n\n - 7+ years of experience in product management, ideally with meaningful time in environments where software intersects with physical systems, industrial operations, or safety-critical applications. \n\n - Demonstrated ability to understand users and their problems, prioritize systematically, set clear metrics and deliver products which deliver impact at scale. \n\n - Clear and concise communicator; you connect across a huge range of technical literacy from PhD engineers and scientists to field operators with no software background \n\n - Demonstrated ability to go deep on technical domains and build credibility with engineers. \n\n - Experience leading cross-functional teams through ambiguous, complex projects with competing constraints \n\n - Intellectual curiosity. You want to understand how the domain works, not treat it as a black box \n\n - Experimentation and growth mindset / desire and ability to learn. Software development and product management has and will continue to change; you are excited to apply the latest and greatest technology and techniques to improve Mariana and the product management team. \n\n - High agency. You own the outcome. \n\nNice to Have\n\n - Experience with autonomous systems, robotics, or fleet-scale operations\n\n - Has been part of a team delivering capital projects of meaningful scale as part of engineering, procurement, project management, construction or other functions\n\n - Hands-on work with ML-powered products — especially RL, process control, or optimization in production settings\n\n - Background in industrial software, digital twin systems, or process automation\n\n - Track record of digital transformation work in traditional industries\n\n - An engineering or technical degree (not required, but the instincts it builds are valued)\n\n\nWHY THIS ROLE\n\nMost senior PM roles are narrowly scoped — you own one product, one feature set, one customer segment. This role is different.\n\nAt Mariana, you don’t need to validate product-market fit because we are the market. If you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle. The constraint is building the right thing, not convincing someone to buy it.\n\nThe number and diversity of problems is unusual: you might work across agentic LLM systems for engineering workflows, RL-based process control, and autonomous fleet optimization in the same quarter.\n\nThis is not SaaS. This is software that runs mines and refineries. If you’re a strong PM looking for something more substantive than another enterprise software product, we’d love to talk.\n\nThings move fast. The distance between “we should build this” and “it’s running in a real facility” is short — and you’ll feel that pace. You’ll work with an unusually diverse set of collaborators: geologists, metallurgists, chemical engineers, construction managers, plant operators, ML engineers, and software developers. There’s no translation layer between you and the domain experts. They’re your direct collaborators.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$180K – $210K • Offers Equity","scrapeableCompensationSalarySummary":"$180K - $210K","compensationTiers":[{"id":"5230bdb9-4e7b-43bc-8b30-f5fc9f7f8677","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $180K – $210K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"59910bf4-1a0f-4079-89c9-d3eb7f6ef8bc","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $180K – $210K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":210000},{"id":"83d36b63-d722-435d-a47c-e09757b9cf2b","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":210000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"cbb21f28-b822-4039-8568-e6a3d2983f83","title":"Mechatronics Engineer (Hardware)","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-06-26T16:30:57.042+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/cbb21f28-b822-4039-8568-e6a3d2983f83","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/cbb21f28-b822-4039-8568-e6a3d2983f83/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring a Mechatronics Engineer (Hardware) to design and build the actuation, automation, and robotic hardware that makes our autonomous mining vehicles move.
In this role you will own the electromechanical and robotics hardware that enables full mining autonomy — drive-by-wire actuation, motion and powertrain systems, robotic mechanisms, and the automation hardware that ties them together. You will carry designs from concept and trade study through CAD, analysis, prototype build, and bench and field validation, working hand in hand with our controls, autonomy software, and systems-engineering teams. This is a hands-on, first-principles role for an engineer who wants to develop the world’s first fully autonomous mines.
Design and integrate actuation hardware for autonomous mining vehicles — drive-by-wire steering, braking, and throttle, electric and electrohydraulic actuators, and the motion and powertrain systems that drive the vehicle
Develop robotic mechanisms and automation hardware (manipulators, end-effectors, automated tooling, and material-handling systems) for unmanned mine operations
Produce detailed CAD models, drawings, tolerance stack-ups, and bills of materials ready for fabrication, procurement, and assembly
Select, size, and qualify actuators, drives, motors, gearboxes, bearings, and e-powertrain components, balancing build-vs-buy decisions against cost, lead time, and reliability
Lead subsystem bench and rig testing, build and instrument prototypes, and drive reliability growth against MTBF and availability targets
Collaborate with controls and autonomy-software engineers to integrate actuation, compute, and sensing into a complete vehicle
Bachelor's degree in Mechatronics, Mechanical, Robotics, Electrical, or related engineering discipline
5-10+ years designing complex electromechanical or robotic systems, ideally including mobile or heavy equipment
Strong proficiency with 3D CAD
Hands-on experience with actuation and motion systems - drive-by-wire, electric or electrohydraulic actuators, motors, drives, gearboxes, and their integration
Working knowledge of design-for-manufacture/assembly and of component selection, qualification, and supplier engagement
Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nWe are hiring a Mechatronics Engineer (Hardware) to design and build the actuation, automation, and robotic hardware that makes our autonomous mining vehicles move.\n\nIn this role you will own the electromechanical and robotics hardware that enables full mining autonomy — drive-by-wire actuation, motion and powertrain systems, robotic mechanisms, and the automation hardware that ties them together. You will carry designs from concept and trade study through CAD, analysis, prototype build, and bench and field validation, working hand in hand with our controls, autonomy software, and systems-engineering teams. This is a hands-on, first-principles role for an engineer who wants to develop the world’s first fully autonomous mines.\n\n\n\nWHAT YOU’LL DO\n\n - Design and integrate actuation hardware for autonomous mining vehicles — drive-by-wire steering, braking, and throttle, electric and electrohydraulic actuators, and the motion and powertrain systems that drive the vehicle\n\n - Develop robotic mechanisms and automation hardware (manipulators, end-effectors, automated tooling, and material-handling systems) for unmanned mine operations\n\n - Produce detailed CAD models, drawings, tolerance stack-ups, and bills of materials ready for fabrication, procurement, and assembly\n\n - Select, size, and qualify actuators, drives, motors, gearboxes, bearings, and e-powertrain components, balancing build-vs-buy decisions against cost, lead time, and reliability\n\n - Lead subsystem bench and rig testing, build and instrument prototypes, and drive reliability growth against MTBF and availability targets\n\n - Collaborate with controls and autonomy-software engineers to integrate actuation, compute, and sensing into a complete vehicle\n \n \n\n\nWHAT YOU’LL BRING\n\n - Bachelor's degree in Mechatronics, Mechanical, Robotics, Electrical, or related engineering discipline\n\n - 5-10+ years designing complex electromechanical or robotic systems, ideally including mobile or heavy equipment\n\n - Strong proficiency with 3D CAD\n\n - Hands-on experience with actuation and motion systems - drive-by-wire, electric or electrohydraulic actuators, motors, drives, gearboxes, and their integration\n\n - Working knowledge of design-for-manufacture/assembly and of component selection, qualification, and supplier engagement\n\n - Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $200K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$140K - $200K","compensationTiers":[{"id":"5528ff75-eb6d-4dd1-a4d0-e6e00117176f","tierSummary":"$140K – $200K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"10360266-5791-4ee3-bfcf-3a34f5335e4b","summary":"$140K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000},{"id":"5f884fd8-e86b-4c89-a0bb-dbd9e801e53d","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"f7d09be9-5f01-4b98-9739-b9b8a56b630e","title":"Staff Machine Learning Engineer (Autonomy)","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-06-26T16:31:23.705+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/f7d09be9-5f01-4b98-9739-b9b8a56b630e","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/f7d09be9-5f01-4b98-9739-b9b8a56b630e/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
We are hiring Machine Learning Engineers (Autonomy) to build the autonomy and sensor-integration software that lets our mining vehicles perceive, decide, and drive themselves.
In this role you will own parts of the software and sensor integration that enables full mining autonomy — sensor fusion across LiDAR, cameras, radar, and IMU/GNSS; perception, localization, and mapping; and the autonomy stack that turns sensing into safe vehicle motion. You will carry work from architecture and algorithm design through implementation, simulation, and bench and field validation, working hand in hand with our hardware, controls, and systems-engineering teams. This is a hands-on, first-principles role for an engineer who wants to develop the world’s first fully autonomous mines.
What You’ll Do
Develop autonomy software for autonomous mining vehicles focusing on one or more area: perception, SLAM, motion planning, and control
Integrate and calibrate the sensing suite (LiDAR, cameras, radar, IMU, GNSS), implementing sensor fusion and time synchronization robust to dust, vibration, and corrosion-heavy mining environments
Build and maintain embedded and real-time software that bridges sensing, compute, and actuation, with attention to safety, latency, and reliability
Develop simulation, logging, and data pipelines to test autonomy behavior and drive performance against safety and availability targets
Lead bench, rig, and field validation of the autonomy stack, debugging across the full software-hardware boundary
Collaborate with hardware and controls engineers to integrate sensing, compute, and actuation into a complete vehicle
What You’ll Bring
Bachelor's degree in Mechatronics, Robotics, Computer Science, Electrical, or related engineering discipline
5-10+ years developing autonomy, robotics, or embedded software, ideally for mobile robots or vehicles
Strong proficiency in C++ and/or Python, and with a robotics middleware such as ROS/ROS 2
Hands-on experience with sensor integration and fusion - LiDAR, cameras, radar, IMU, GNSS - and with perception, localization, or motion-planning algorithms
Working knowledge of real-time and embedded systems, and of the controls and software-hardware integration that drive actuation
Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nWe are hiring Machine Learning Engineers (Autonomy) to build the autonomy and sensor-integration software that lets our mining vehicles perceive, decide, and drive themselves.\n\nIn this role you will own parts of the software and sensor integration that enables full mining autonomy — sensor fusion across LiDAR, cameras, radar, and IMU/GNSS; perception, localization, and mapping; and the autonomy stack that turns sensing into safe vehicle motion. You will carry work from architecture and algorithm design through implementation, simulation, and bench and field validation, working hand in hand with our hardware, controls, and systems-engineering teams. This is a hands-on, first-principles role for an engineer who wants to develop the world’s first fully autonomous mines.\n\nWhat You’ll Do\n\n - Develop autonomy software for autonomous mining vehicles focusing on one or more area: perception, SLAM, motion planning, and control\n\n - Integrate and calibrate the sensing suite (LiDAR, cameras, radar, IMU, GNSS), implementing sensor fusion and time synchronization robust to dust, vibration, and corrosion-heavy mining environments\n\n - Build and maintain embedded and real-time software that bridges sensing, compute, and actuation, with attention to safety, latency, and reliability\n\n - Develop simulation, logging, and data pipelines to test autonomy behavior and drive performance against safety and availability targets\n\n - Lead bench, rig, and field validation of the autonomy stack, debugging across the full software-hardware boundary\n\n - Collaborate with hardware and controls engineers to integrate sensing, compute, and actuation into a complete vehicle\n\n\n\nWhat You’ll Bring\n\n - Bachelor's degree in Mechatronics, Robotics, Computer Science, Electrical, or related engineering discipline\n\n - 5-10+ years developing autonomy, robotics, or embedded software, ideally for mobile robots or vehicles\n\n - Strong proficiency in C++ and/or Python, and with a robotics middleware such as ROS/ROS 2\n\n - Hands-on experience with sensor integration and fusion - LiDAR, cameras, radar, IMU, GNSS - and with perception, localization, or motion-planning algorithms\n\n - Working knowledge of real-time and embedded systems, and of the controls and software-hardware integration that drive actuation\n\n - Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$160K – $200K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$160K - $200K","compensationTiers":[{"id":"60c2c5f3-342d-484c-8c6d-0f18157307c5","tierSummary":"$160K – $200K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"2a8929fb-c413-4463-ad90-64d8ccc3726c","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"d0b9ad57-28a5-49f7-a91d-9d4860bb65b1","summary":"$160K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":160000,"maxValue":200000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":160000,"maxValue":200000}]}},{"id":"8cf099aa-a149-4f5d-a690-583329acadd3","title":"Manager, Piping Design & Engineering","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"San Francisco HQ","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}}}],"publishedAt":"2026-04-17T18:13:40.856+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/8cf099aa-a149-4f5d-a690-583329acadd3","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/8cf099aa-a149-4f5d-a690-583329acadd3/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
We are hiring a Manager, Piping Design & Engineering to build and lead the piping discipline behind our refining and minerals processing facilities. The team, the 3D model, the design workflows, and the standards every piping deliverable comes out of.
You will own Mariana's piping design group: the designers who build the model, the stress engineers who validate it, and the staff-aug, high-value engineering center, and EPC piping teams that extend it. You own the 3D model as the source of truth, including the metadata behind it, and you develop the workflow that carries a line from P&ID to routed model to stress-checked to supported to issued for construction. You'll also set the stress criteria, own the piping material, valve, and support specifications, and pick up Caesar II or the model yourself when the work calls for it.
What You’ll Do
Lead the piping design team
Build and lead Mariana's piping design group. Hire, develop, and directly manage piping designers and stress engineers
Manage the blended delivery team. In-house, staff-augs, high-value engineering centers, and third-party engineering firm piping groups
Load-balance work across concurrent projects, hold the schedule for piping deliverables, and coach designers through the work
Attract non-conventional engineering talent to piping design and engineering positions to develop advanced automation solutions
Own the 3D model
Own 3D model development end to end in Plant 3D and Revit. Plot plan and equipment layout through routing, supports, and IFC isometrics
Own how the model is built: structure and breakdown, project setup, naming conventions, revision control, and change rights
Own the spec catalogs and component libraries inside the model, so piping specs are enforced by the model rather than caught in review
Run 30 / 60 / 90% model reviews and Navisworks clash detection across disciplines, and drive resolution to closure
Define the model, drawing, and file format requirements EPCs and vendors deliver against, and integrate their content into Mariana's environment
Keep the model the single source of truth for quantities. Isometrics, BOMs, and take-offs generated from the model, not maintained beside it
Evaluate and implement state of the art agentic engineering and automation softwares
Develop the design workflows and standards
Develop and implement the piping design workflow itself. The path from P&ID to IFC, what gets checked at each gate, and who signs it
Build the standards behind it: piping design criteria, layout and access standards, drafting standards, iso and drawing templates, and support detail libraries
Establish squad check and design checking practice, with disciplined comment resolution, revision control, and IFR / IFA / IFC issue
Automate the repetitive work with our software team. Model-to-stress data exchange, spec-driven checks, quantity reporting, and QC scripting
Own the engineering and stress scope
Own the pipe stress program. Set the criteria, decide which lines are critical, and approve every package before it drives a support or a nozzle
Direct dynamic analyses. Slug flow, water hammer, relief valve transients, and vibration
Own piping material specifications, valve specs, and engineering standards, including material selection for hydromet, pyromet, and reagent services
Design and specify pipe supports, guides, anchors, expansion joints, and specialty components, and own the support detail standards
Ensure all piping systems comply with ASME B31.3, and B31.1 where applicable
Drive piping procurement and support construction and commissioning. Bulk material strategy, long-lead valves and specialty items, field RFIs, redlines, and as-built model closeout
What You’ll Bring
10+ years in piping design and engineering, delivered in an EPC, EPCM, or owner capital projects environment
Direct experience managing a piping design department or group
Demonstrated ownership of 3D model development on a capital project, concept through IFC, including multidiscipline reviews and Navisworks clash detection
Track record building piping design workflows and standards
Strong pipe stress background in Caesar II
Depth in ASME B31.3, including allowable load definition and nozzle load evaluation
Experience developing piping material and valve specifications and pipe support design criteria
Bachelor's degree in Mechanical Engineering or a related field
Preferred, but not required
Professional Engineer (PE) license, or the ability to obtain one
Mining, mineral processing, metallurgical, chemical, or heavy industrial facility experience
Slurry, reagent, and high-temperature or refractory-lined piping, including lined and non-metallic materials
Scripting or model-based automation
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nWe are hiring a Manager, Piping Design & Engineering to build and lead the piping discipline behind our refining and minerals processing facilities. The team, the 3D model, the design workflows, and the standards every piping deliverable comes out of.\n\nYou will own Mariana's piping design group: the designers who build the model, the stress engineers who validate it, and the staff-aug, high-value engineering center, and EPC piping teams that extend it. You own the 3D model as the source of truth, including the metadata behind it, and you develop the workflow that carries a line from P&ID to routed model to stress-checked to supported to issued for construction. You'll also set the stress criteria, own the piping material, valve, and support specifications, and pick up Caesar II or the model yourself when the work calls for it.\n\nWhat You’ll Do\n\nLead the piping design team\n\n - Build and lead Mariana's piping design group. Hire, develop, and directly manage piping designers and stress engineers\n\n - Manage the blended delivery team. In-house, staff-augs, high-value engineering centers, and third-party engineering firm piping groups\n\n - Load-balance work across concurrent projects, hold the schedule for piping deliverables, and coach designers through the work\n\n - Attract non-conventional engineering talent to piping design and engineering positions to develop advanced automation solutions\n\nOwn the 3D model\n\n - Own 3D model development end to end in Plant 3D and Revit. Plot plan and equipment layout through routing, supports, and IFC isometrics\n\n - Own how the model is built: structure and breakdown, project setup, naming conventions, revision control, and change rights\n\n - Own the spec catalogs and component libraries inside the model, so piping specs are enforced by the model rather than caught in review\n\n - Run 30 / 60 / 90% model reviews and Navisworks clash detection across disciplines, and drive resolution to closure\n\n - Define the model, drawing, and file format requirements EPCs and vendors deliver against, and integrate their content into Mariana's environment\n\n - Keep the model the single source of truth for quantities. Isometrics, BOMs, and take-offs generated from the model, not maintained beside it\n\n - Evaluate and implement state of the art agentic engineering and automation softwares\n\nDevelop the design workflows and standards\n\n - Develop and implement the piping design workflow itself. The path from P&ID to IFC, what gets checked at each gate, and who signs it\n\n - Build the standards behind it: piping design criteria, layout and access standards, drafting standards, iso and drawing templates, and support detail libraries\n\n - Establish squad check and design checking practice, with disciplined comment resolution, revision control, and IFR / IFA / IFC issue\n\n - Automate the repetitive work with our software team. Model-to-stress data exchange, spec-driven checks, quantity reporting, and QC scripting\n\nOwn the engineering and stress scope\n\n - Own the pipe stress program. Set the criteria, decide which lines are critical, and approve every package before it drives a support or a nozzle\n\n - Direct dynamic analyses. Slug flow, water hammer, relief valve transients, and vibration\n\n - Own piping material specifications, valve specs, and engineering standards, including material selection for hydromet, pyromet, and reagent services\n\n - Design and specify pipe supports, guides, anchors, expansion joints, and specialty components, and own the support detail standards\n\n - Ensure all piping systems comply with ASME B31.3, and B31.1 where applicable\n\n - Drive piping procurement and support construction and commissioning. Bulk material strategy, long-lead valves and specialty items, field RFIs, redlines, and as-built model closeout\n\n\n\nWhat You’ll Bring\n\n - 10+ years in piping design and engineering, delivered in an EPC, EPCM, or owner capital projects environment\n\n - Direct experience managing a piping design department or group\n\n - Demonstrated ownership of 3D model development on a capital project, concept through IFC, including multidiscipline reviews and Navisworks clash detection\n\n - Track record building piping design workflows and standards\n\n - Strong pipe stress background in Caesar II\n\n - Depth in ASME B31.3, including allowable load definition and nozzle load evaluation\n\n - Experience developing piping material and valve specifications and pipe support design criteria\n\n - Bachelor's degree in Mechanical Engineering or a related field\n\nPreferred, but not required\n\n - Professional Engineer (PE) license, or the ability to obtain one\n\n - Mining, mineral processing, metallurgical, chemical, or heavy industrial facility experience\n\n - Slurry, reagent, and high-temperature or refractory-lined piping, including lined and non-metallic materials\n\n - Scripting or model-based automation\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$170K – $210K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$170K - $210K","compensationTiers":[{"id":"8867086f-4394-4be5-ab32-411ce59f3173","tierSummary":"$170K – $210K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"6ef65697-dc9b-4aec-998c-68d69164f8be","summary":"$170K – $210K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":170000,"maxValue":210000},{"id":"e0e31323-2d5f-4bc7-a2e6-3f8abfd20e3e","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":170000,"maxValue":210000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"34857c47-bde0-4dce-933b-f07291b5c999","title":"Analytical Applications Engineer","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-08-12T19:02:42.495+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/34857c47-bde0-4dce-933b-f07291b5c999","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/34857c47-bde0-4dce-933b-f07291b5c999/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
This is an internal, cross-site role focused on supporting and advancing analytical capabilities across multiple company locations.
The position centers on method development, troubleshooting analytical methodologies, and implementing new instrumentation and procedures. The ideal candidate will combine strong analytical expertise with hands-on mechanical aptitude and the ability to work across diverse lab environments.
This position requires working full-time on-site at our Moab, UT facility.
Support and optimize analytical methodologies across multiple Mariana Minerals laboratory sites
Troubleshoot and resolve issues related to analytical techniques, data quality, and method performance
Lead and support implementation of new instrumentation (e.g., ICP-OES, ICP-MS, Atomic Absorption, or similar systems)
Develop, validate, and standardize analytical methods and workflows
Train laboratory personnel on instrumentation, analytical techniques, and best practices
Collaborate with cross-functional teams to improve analytical efficiency and data reliability
Assist in evaluating new technologies and recommending improvements to existing systems
Maintain documentation for methods, SOPs, and internal technical guidance
Provide internal technical support for complex analytical challenges
Bachelor’s degree in Analytical Chemistry, Chemistry, or a related scientific discipline (recent graduates encouraged to apply)
Hands-on experience (academic, internship, or research) with ICP-OES, ICP-MS, Atomic Absorption, or similar analytical instrumentation preferred
Strong understanding of analytical techniques, sample preparation, and data interpretation
Mechanical aptitude and comfort working with tools, instrumentation components, and basic diagnostics equipment (e.g., multimeters/voltmeters)
Strong problem-solving and troubleshooting skills
Excellent communication skills with the ability to train and support internal teams
Ability to work both independently and collaboratively across multiple sites
Up to 50% travel, primarily within the continental United States
Occasional international travel may be required
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nThis is an internal, cross-site role focused on supporting and advancing analytical capabilities across multiple company locations.\n\nThe position centers on method development, troubleshooting analytical methodologies, and implementing new instrumentation and procedures. The ideal candidate will combine strong analytical expertise with hands-on mechanical aptitude and the ability to work across diverse lab environments.\n\n\n\nThis position requires working full-time on-site at our Moab, UT facility.\n\n\n\n\n\nWHAT YOU’LL DO\n\n - Support and optimize analytical methodologies across multiple Mariana Minerals laboratory sites\n\n - Troubleshoot and resolve issues related to analytical techniques, data quality, and method performance\n\n - Lead and support implementation of new instrumentation (e.g., ICP-OES, ICP-MS, Atomic Absorption, or similar systems)\n\n - Develop, validate, and standardize analytical methods and workflows\n\n - Train laboratory personnel on instrumentation, analytical techniques, and best practices\n\n - Collaborate with cross-functional teams to improve analytical efficiency and data reliability\n\n - Assist in evaluating new technologies and recommending improvements to existing systems\n\n - Maintain documentation for methods, SOPs, and internal technical guidance\n\n - Provide internal technical support for complex analytical challenges\n\n\n\n\nWHAT YOU’LL BRING\n\n - Bachelor’s degree in Analytical Chemistry, Chemistry, or a related scientific discipline (recent graduates encouraged to apply)\n\n - Hands-on experience (academic, internship, or research) with ICP-OES, ICP-MS, Atomic Absorption, or similar analytical instrumentation preferred\n\n - Strong understanding of analytical techniques, sample preparation, and data interpretation\n\n - Mechanical aptitude and comfort working with tools, instrumentation components, and basic diagnostics equipment (e.g., multimeters/voltmeters)\n\n - Strong problem-solving and troubleshooting skills\n\n - Excellent communication skills with the ability to train and support internal teams\n\n - Ability to work both independently and collaboratively across multiple sites\n \n \n\n\nTRAVEL REQUIREMENTS\n\n - Up to 50% travel, primarily within the continental United States\n\n - Occasional international travel may be required\n \n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$85K – $100K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$85K - $100K","compensationTiers":[{"id":"2c9680ed-cbcb-4d9c-b8a6-c9a6841684b3","tierSummary":"$85K – $100K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"49ad9be1-5a9e-4e70-80ab-e6caa421647d","summary":"$85K – $100K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":85000,"maxValue":100000},{"id":"167fc947-c11a-4c58-820b-1a9128a6249c","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":85000,"maxValue":100000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"d3e22452-b8d7-453f-8f09-b46bb02a5194","title":"Project Electrician ","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-02T03:33:20.621+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/d3e22452-b8d7-453f-8f09-b46bb02a5194","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/d3e22452-b8d7-453f-8f09-b46bb02a5194/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
As an Electrician on our new Moab project team (formerly Lisbon Mines), you'll handle wiring, instrumentation, and PLC work on new equipment and systems.
The ideal candidate thrives on variety and wants to be part of a growing company. The work varies week to week, from building panels and calibrating instruments to helping bring PLC systems online. As one of the first members of a new project team, you'll often own a job from start to finish and build new skills along the way.
Responsibilities:
Install, wire, and terminate equipment, panels, and control systems for new projects
Install, calibrate, and troubleshoot field instrumentation
Support PLC work, including logic troubleshooting, I/O checkout, and bringing systems online
Read and work from electrical drawings, schematics, and control diagrams
Plan and carry out small electrical projects independently
Partner with the project mechanic and project engineer on installs and startups
Follow electrical safety practices, including lockout/tagout and arc flash procedures
Qualifications:
5+ years of experience as an industrial electrician, instrumentation technician, or controls/electronics technician. Journeyman preferred not required.
Hands-on experience with PLC-based control systems and industrial controls
Strong instrumentation skills, including calibrating and troubleshooting 4–20 mA loops, pressure transducers, and flow meters
Advanced diagnostic and root-cause troubleshooting on electrical, electronic, and control systems
Experience with industrial networking and communication protocols
Comfort working independently and a willingness to jump into unfamiliar systems and learn them quickly
Background in oil and gas, mining, manufacturing, or other heavy industrial field environments
Experience with VFDs, motor controls, data acquisition, or multiple PLC platforms is a plus
Current MSHA training is a plus
Schedule: Monday–Friday, Days
Physical Requirements:
Ability to lift a minimum of 50 pounds
Ability to stand, kneel, bend, and climb ladders for extended periods
Ability to work at heights and in confined spaces using fall protection and other required PPE
Normal color vision to identify wire color-coding, plus adequate visual acuity and hearing (with correction/aids if needed) to work safely around energized equipment
Ability to work in all weather conditions, including extreme temperatures, and tolerate exposure to fumes, dust, diesel, solvents, sulfuric acid, and other hazardous materials
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nAs an Electrician on our new Moab project team (formerly Lisbon Mines), you'll handle wiring, instrumentation, and PLC work on new equipment and systems.\n\nThe ideal candidate thrives on variety and wants to be part of a growing company. The work varies week to week, from building panels and calibrating instruments to helping bring PLC systems online. As one of the first members of a new project team, you'll often own a job from start to finish and build new skills along the way.\n\nResponsibilities:\n\n - Install, wire, and terminate equipment, panels, and control systems for new projects\n\n - Install, calibrate, and troubleshoot field instrumentation\n\n - Support PLC work, including logic troubleshooting, I/O checkout, and bringing systems online\n\n - Read and work from electrical drawings, schematics, and control diagrams\n\n - Plan and carry out small electrical projects independently\n\n - Partner with the project mechanic and project engineer on installs and startups\n\n - Follow electrical safety practices, including lockout/tagout and arc flash procedures\n\nQualifications:\n\n - 5+ years of experience as an industrial electrician, instrumentation technician, or controls/electronics technician. Journeyman preferred not required.\n\n - Hands-on experience with PLC-based control systems and industrial controls\n\n - Strong instrumentation skills, including calibrating and troubleshooting 4–20 mA loops, pressure transducers, and flow meters\n\n - Advanced diagnostic and root-cause troubleshooting on electrical, electronic, and control systems\n\n - Experience with industrial networking and communication protocols\n\n - Comfort working independently and a willingness to jump into unfamiliar systems and learn them quickly\n\n - Background in oil and gas, mining, manufacturing, or other heavy industrial field environments\n\n - Experience with VFDs, motor controls, data acquisition, or multiple PLC platforms is a plus\n\n - Current MSHA training is a plus\n\nSchedule: Monday–Friday, Days\n\nPhysical Requirements:\n\n - Ability to lift a minimum of 50 pounds\n\n - Ability to stand, kneel, bend, and climb ladders for extended periods\n\n - Ability to work at heights and in confined spaces using fall protection and other required PPE\n\n - Normal color vision to identify wire color-coding, plus adequate visual acuity and hearing (with correction/aids if needed) to work safely around energized equipment\n\n - Ability to work in all weather conditions, including extreme temperatures, and tolerate exposure to fumes, dust, diesel, solvents, sulfuric acid, and other hazardous materials\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"c59fd9e0-27b9-4125-bcfc-40569938359e","title":"Staff Mechanical Engineer","department":"Process Development","team":"Process Development","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-07-29T06:28:00.069+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/c59fd9e0-27b9-4125-bcfc-40569938359e","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/c59fd9e0-27b9-4125-bcfc-40569938359e/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is seeking a highly motivated Staff Mechanical Engineer to support our next-generation minerals processing pilot plant in Houston. You will lead the design, integration, and deployment of pilot-scale mechanical systems and processing equipment used to demonstrate and scale innovative refining technologies for critical minerals. This role is highly hands-on and will play a key role in building and maintaining a first-of-its-kind pilot plant. You will work closely with process engineers, technicians, and cross-functional teams to design, install, commission, and improve pilot-scale equipment while ensuring systems are reliable, safe, and scalable to commercial production.
Design, specify, and deploy mechanical systems and equipment for pilot-scale mineral processing operations
Work closely with process engineers to translate process requirements into practical mechanical and plant designs
Support installation, troubleshooting, and maintenance of pilot plant equipment including pumps, piping systems, reactors, separators, filtration systems, and material handling equipment
Develop and maintain mechanical design documentation including equipment specifications, layout drawings, piping schematics, and CAD models
Identify opportunities to improve equipment reliability, maintainability, and operational performance
Coordinate with vendors, fabricators, and contractors during equipment procurement and installation
Support safe plant operations by contributing to hazard reviews, equipment safety design, and mechanical integrity programs
B.S., M.S., or PhD in Mechanical Engineering or a related field
9+ years of experience in operations, process scale-up, or plant design in minerals processing, chemicals, specialty materials, oil & gas, or related industries
Demonstrated experience driving equipment design, commissioning, operations, and reliability
Experience designing and maintaining furnaces, pumps and fluid handling systems, pressure vessels and reactors, piping systems and valves, filtration and separation equipment, and materials handling systems
Ability to work closely with cross-functional teams including process engineering, operations, and project execution
Strong troubleshooting and problem-solving skills in hands-on plant environments
Strong commitment to Health, Safety, and Environmental compliance and mechanical integrity standards
Excellent technical writing, communication, and teamwork skills
Comfortable working in fast-paced environments, wearing multiple hats, and managing ambiguity
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is seeking a highly motivated Staff Mechanical Engineer to support our next-generation minerals processing pilot plant in Houston. You will lead the design, integration, and deployment of pilot-scale mechanical systems and processing equipment used to demonstrate and scale innovative refining technologies for critical minerals. This role is highly hands-on and will play a key role in building and maintaining a first-of-its-kind pilot plant. You will work closely with process engineers, technicians, and cross-functional teams to design, install, commission, and improve pilot-scale equipment while ensuring systems are reliable, safe, and scalable to commercial production.\n\n\n\n\nWHAT YOU’LL DO\n\n - Design, specify, and deploy mechanical systems and equipment for pilot-scale mineral processing operations\n\n - Work closely with process engineers to translate process requirements into practical mechanical and plant designs\n\n - Support installation, troubleshooting, and maintenance of pilot plant equipment including pumps, piping systems, reactors, separators, filtration systems, and material handling equipment\n\n - Develop and maintain mechanical design documentation including equipment specifications, layout drawings, piping schematics, and CAD models\n\n - Identify opportunities to improve equipment reliability, maintainability, and operational performance\n\n - Coordinate with vendors, fabricators, and contractors during equipment procurement and installation\n\n - Support safe plant operations by contributing to hazard reviews, equipment safety design, and mechanical integrity programs\n \n \n\n\nDESIRED QUALIFICATIONS\n\n - B.S., M.S., or PhD in Mechanical Engineering or a related field\n\n - 9+ years of experience in operations, process scale-up, or plant design in minerals processing, chemicals, specialty materials, oil & gas, or related industries\n\n - Demonstrated experience driving equipment design, commissioning, operations, and reliability\n\n - Experience designing and maintaining furnaces, pumps and fluid handling systems, pressure vessels and reactors, piping systems and valves, filtration and separation equipment, and materials handling systems\n\n - Ability to work closely with cross-functional teams including process engineering, operations, and project execution\n\n - Strong troubleshooting and problem-solving skills in hands-on plant environments\n\n - Strong commitment to Health, Safety, and Environmental compliance and mechanical integrity standards\n\n - Excellent technical writing, communication, and teamwork skills\n\n - Comfortable working in fast-paced environments, wearing multiple hats, and managing ambiguity\n \n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $175K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $175K","compensationTiers":[{"id":"713b6757-7aac-4d79-a20b-d7a8603a2dc4","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $175K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"fac890e9-a929-4628-94a2-00ac0fb0e558","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"6877c7dd-e943-40b5-b9db-adbd6d9e8499","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $175K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000}]}},{"id":"0f7487f1-7396-4bd1-8339-66615e10b94a","title":"Sr/Staff Electrical Engineer","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-05-28T19:08:39.420+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/0f7487f1-7396-4bd1-8339-66615e10b94a","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/0f7487f1-7396-4bd1-8339-66615e10b94a/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
We are hiring a Senior / Staff Electrical Engineer to own the medium and low-voltage power systems behind our refining and minerals processing facilities. From the incoming service point through the MV substations, e-houses, MCCs, and drives, down to the last motor and panelboard.
You will set the electrical design basis for each facility and then work both sides of the line — self-performing the studies and packages that decide how the plant gets built, while reviewing and approving detailed engineering deliverables from third party engineering firms. You will carry that through procurement, into the field, and out through commissioning and energization.
What You’ll Do
Own the MV/LV design basis. Voltage levels, system grounding, fault levels, load segregation, redundancy, and standby power
Build and maintain the plant load list from process and mechanical equipment lists, and carry it through concept and detailed design
Size and configure the distribution. Main MV switchgear, unit substations, e-houses and PDCs, MCCs, LV switchboards, and branch distribution down to the loads
Build and maintain the ETAP model of each plant as the single source of truth, and keep it current as loads move
Write datasheets and technical specifications for MV switchgear, unit substations, transformers, MCCs, LV and MV VFDs, UPS and DC systems, and modular e-houses
Lead procurement including technical bid evaluation, vendor drawing review, FAT witness, and early management of the long-lead equipment
Write the electrical scope of work in our third party engineering contracts, and review and approve deliverables
Self-perform the packages that are faster or better done in-house
Classify hazardous areas for hydromet, pyromet, and reagent handling areas, and design equipment accordingly
Coordinate across multi-disciplinary detailed engineering phases
Support construction and commissioning. RFI resolution and field changes, insulation resistance and hipot, relay injection, NETA ATS acceptance testing, and MCC and drive functional checks
Write energization plans and switching procedures, phase energization through a plant still under construction, and close out with as-builts, setting files, and turnover packages
What You’ll Bring
8+ years designing MV and LV power distribution for industrial process facilities, delivered in an EPC, owner’s-engineer, or capital projects environment
Hands-on modeling in ETAP (preferred), SKM PowerTools, or EasyPower
Depth in the core studies: load flow, short circuit, motor starting, protective coordination, and arc flash
Specification and procurement track record on MV switchgear, unit substations, transformers, MCCs, VFDs, and e-houses
Fluency in NEC, IEEE, NFPA 70E, and in hazardous area classification
Comfortable both redlining EPC deliverables and producing them yourself when that is faster
Bachelor of Science Electrical Engineering. PE strongly preferred
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nWe are hiring a Senior / Staff Electrical Engineer to own the medium and low-voltage power systems behind our refining and minerals processing facilities. From the incoming service point through the MV substations, e-houses, MCCs, and drives, down to the last motor and panelboard.\n\nYou will set the electrical design basis for each facility and then work both sides of the line — self-performing the studies and packages that decide how the plant gets built, while reviewing and approving detailed engineering deliverables from third party engineering firms. You will carry that through procurement, into the field, and out through commissioning and energization.\n\nWhat You’ll Do\n\n - Own the MV/LV design basis. Voltage levels, system grounding, fault levels, load segregation, redundancy, and standby power\n\n - Build and maintain the plant load list from process and mechanical equipment lists, and carry it through concept and detailed design\n\n - Size and configure the distribution. Main MV switchgear, unit substations, e-houses and PDCs, MCCs, LV switchboards, and branch distribution down to the loads\n\n - Build and maintain the ETAP model of each plant as the single source of truth, and keep it current as loads move\n\n - Write datasheets and technical specifications for MV switchgear, unit substations, transformers, MCCs, LV and MV VFDs, UPS and DC systems, and modular e-houses\n\n - Lead procurement including technical bid evaluation, vendor drawing review, FAT witness, and early management of the long-lead equipment\n\n - Write the electrical scope of work in our third party engineering contracts, and review and approve deliverables\n\n - Self-perform the packages that are faster or better done in-house\n\n - Classify hazardous areas for hydromet, pyromet, and reagent handling areas, and design equipment accordingly\n\n - Coordinate across multi-disciplinary detailed engineering phases\n\n - Support construction and commissioning. RFI resolution and field changes, insulation resistance and hipot, relay injection, NETA ATS acceptance testing, and MCC and drive functional checks\n\n - Write energization plans and switching procedures, phase energization through a plant still under construction, and close out with as-builts, setting files, and turnover packages\n\n\n\nWhat You’ll Bring\n\n - 8+ years designing MV and LV power distribution for industrial process facilities, delivered in an EPC, owner’s-engineer, or capital projects environment\n\n - Hands-on modeling in ETAP (preferred), SKM PowerTools, or EasyPower\n\n - Depth in the core studies: load flow, short circuit, motor starting, protective coordination, and arc flash\n\n - Specification and procurement track record on MV switchgear, unit substations, transformers, MCCs, VFDs, and e-houses\n\n - Fluency in NEC, IEEE, NFPA 70E, and in hazardous area classification\n\n - Comfortable both redlining EPC deliverables and producing them yourself when that is faster\n\n - Bachelor of Science Electrical Engineering. PE strongly preferred\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $210K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$140K - $210K","compensationTiers":[{"id":"041583b8-c71e-4d9c-8b4c-96c6ab85a35e","tierSummary":"$140K – $210K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"145fb751-c2da-4f5b-b27b-bd82943897ae","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"7b7ce9de-f381-4235-97c6-a414837c7e59","summary":"$140K – $210K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":210000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":210000}]}},{"id":"340bd277-38b5-4cf8-a542-750a1e808ba3","title":"Procurement Manager ","department":"Commercial & Product","team":"Commercial & Product","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-07-22T13:48:13.128+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/340bd277-38b5-4cf8-a542-750a1e808ba3","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/340bd277-38b5-4cf8-a542-750a1e808ba3/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana is hiring a Procurement Manager to own procurement for our new projects and pre-operational sites. This is a senior, self-directed role requiring deep technical and commercial experience in industrial procurement.
In this role, you will ensure sites have the supply agreements, vendor relationships, and procurement coverage they need before they go live. You will work across engineering, operations, and commercial functions to translate project needs into executed contracts, and identify sourcing opportunities across the portfolio. This role covers operating supplies, consumables, and non-construction capital spend. Construction and fixed equipment procurement are owned by the Capital Projects team.
What You’ll Do
Work directly with engineering and technical teams to define procurement requirements for pre-operational sites; translate technical specifications into sourcing scope
Own end-to-end pre-operational procurement: qualify vendors per established policy frameworks, run RFQ and competitive bid processes, negotiate pricing and contract terms, execute purchases, manage first deliveries
Procure operating supplies and consumables (including reagents and spare parts) and non-construction capital spend (including mobile equipment)
Ensure all contracts are reviewed for policy compliance and enterprise-level alignment prior to execution; flag clauses with broader implications
Own vendor relationships through the pre-operational phase; ensure clean handoff to on-site procurement as sites become operational
Support on-site procurement on complex purchases, high-value negotiations, and new project scope at existing operational sites
Lead cross-site consolidation sourcing events to identify and capture volume-based savings opportunities
Contribute quote data and supplier information to the organization's pricing and market intelligence database
Coordinate across site and project teams to ensure continuity of supply through startup and into operations
Desired Qualifications
Bachelor's degree in engineering, materials science, chemistry, or a related technical field required. Candidates without a degree who can demonstrate equivalent technical depth through experience will be considered.
8-12+ years of experience in procurement, project procurement, or capital purchasing in mining, industrials, chemicals, or a related sector
Proven track record of owning pre-operational or greenfield site procurement from spec to first delivery
Strong technical background with the ability to read specifications, understand process requirements, and engage credibly with engineering teams
Excellent negotiation skills with a track record of securing favorable terms under time pressure and without a large team behind you
Highly organized with the ability to manage multiple concurrent procurement workstreams across different projects and sites
Comfortable operating with ambiguity and limited structure; takes ownership and figures it out
Proficient with software tools for project tracking, workstream management, and reporting
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nMariana is hiring a Procurement Manager to own procurement for our new projects and pre-operational sites. This is a senior, self-directed role requiring deep technical and commercial experience in industrial procurement.\n\nIn this role, you will ensure sites have the supply agreements, vendor relationships, and procurement coverage they need before they go live. You will work across engineering, operations, and commercial functions to translate project needs into executed contracts, and identify sourcing opportunities across the portfolio. This role covers operating supplies, consumables, and non-construction capital spend. Construction and fixed equipment procurement are owned by the Capital Projects team.\n\nWhat You’ll Do\n\n 1. Work directly with engineering and technical teams to define procurement requirements for pre-operational sites; translate technical specifications into sourcing scope\n\n 2. Own end-to-end pre-operational procurement: qualify vendors per established policy frameworks, run RFQ and competitive bid processes, negotiate pricing and contract terms, execute purchases, manage first deliveries\n\n 3. Procure operating supplies and consumables (including reagents and spare parts) and non-construction capital spend (including mobile equipment)\n\n 4. Ensure all contracts are reviewed for policy compliance and enterprise-level alignment prior to execution; flag clauses with broader implications\n\n 5. Own vendor relationships through the pre-operational phase; ensure clean handoff to on-site procurement as sites become operational\n\n 6. Support on-site procurement on complex purchases, high-value negotiations, and new project scope at existing operational sites\n\n 7. Lead cross-site consolidation sourcing events to identify and capture volume-based savings opportunities\n\n 8. Contribute quote data and supplier information to the organization's pricing and market intelligence database\n\n 9. Coordinate across site and project teams to ensure continuity of supply through startup and into operations\n\n\n\nDesired Qualifications\n\n 1. Bachelor's degree in engineering, materials science, chemistry, or a related technical field required. Candidates without a degree who can demonstrate equivalent technical depth through experience will be considered.\n\n 2. 8-12+ years of experience in procurement, project procurement, or capital purchasing in mining, industrials, chemicals, or a related sector\n\n 3. Proven track record of owning pre-operational or greenfield site procurement from spec to first delivery\n\n 4. Strong technical background with the ability to read specifications, understand process requirements, and engage credibly with engineering teams\n\n 5. Excellent negotiation skills with a track record of securing favorable terms under time pressure and without a large team behind you\n\n 6. Highly organized with the ability to manage multiple concurrent procurement workstreams across different projects and sites\n\n 7. Comfortable operating with ambiguity and limited structure; takes ownership and figures it out\n\n 8. Proficient with software tools for project tracking, workstream management, and reporting\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $170K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $170K","compensationTiers":[{"id":"d32cfa7e-0dee-47da-8dc9-d024566258b9","tierSummary":"Estimated base salary $150K – $170K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"8170b064-2067-41a3-951e-538f4c7252dd","summary":"Estimated base salary $150K – $170K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":170000},{"id":"d3224c44-7061-4fff-bf7f-0c38706c01db","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":170000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"d64c4408-8af6-47a9-916c-1b81705eaae2","title":"Sr. Construction Project Manager","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-06-09T20:06:31.071+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/d64c4408-8af6-47a9-916c-1b81705eaae2","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/d64c4408-8af6-47a9-916c-1b81705eaae2/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
As a Sr. Construction Project Manager, you will play a central role in managing new facility construction, capacity expansions, and major infrastructure projects. You'll oversee contractors and project teams, manage budgets and timelines, and lead both in-field and office-based initiatives to deliver strategic capital projects. Your expertise will be vital to scaling operations safely, efficiently, and on budget.
Project Ownership & Delivery:
Take end-to-end ownership of assigned construction projects, ensuring stakeholder satisfaction and identifying cost efficiencies.
Direct project delivery from scope development and contractor procurement to construction, commissioning, and project close-out.
Lead project startup activities including forecasting, budgeting, and job cost tracking.
Manage major purchase orders with thorough pricing and scope reviews.
Ensure project compliance with Mariana Minerals standards and company policies.
Procurement & Commercial Management:
Evaluate bids, manage procurement, and negotiate for optimal project outcomes.
Review plans and technical diagrams to verify all required material and hardware are accounted for.
Handle change orders and claims, seeking favorable commercial resolution.
Prepare regular project reports on cost, schedule, risks, and overall quality.
Contractor & Stakeholder Management:
Maintain open communication with cross-functional teams (QC, QA, commissioning, facilities, operations).
Oversee contractor performance to ensure achievement of KPIs and deliverables.
Liaise with regulatory, permitting, and community stakeholders as needed.
Systems & Automation:
Collaborate with software engineering to advance project management tools and support ongoing automation.
Mentor junior team members and foster a culture of growth and efficiency.
Health, Safety & Environment:
Lead a \"zero-harm\" safety culture, conducting regular safety reviews and toolbox talks.
Ensure alignment with all HSE plans and regulatory requirements.
Monitor and manage environmental controls (dust, water, waste) during construction.
Bachelor’s degree in Construction Management, Engineering, or related field; or equivalent experience.
8+ years in construction project management in industrial/mining/processing plants.
Demonstrated success delivering capital projects of $20M+ on schedule and within budget.
Skilled in Primavera P6, Microsoft Project, Office Suite, accounting, and estimating tools.
Proficient at reading and interpreting contracts, engineering documentation, and specifications.
Strong knowledge of construction practices, industry codes, procurement, electrical fundamentals, and accounting.
Excellent communication, judgment, and decision-making abilities in dynamic environments.
Willingness to travel up to 50% to project sites or offices.
Experience with EPC/EPCM delivery models highly desirable.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nSR. CONSTRUCTION PROJECT MANAGER\n\n \n\n\nROLE OVERVIEW \n\nAs a Sr. Construction Project Manager, you will play a central role in managing new facility construction, capacity expansions, and major infrastructure projects. You'll oversee contractors and project teams, manage budgets and timelines, and lead both in-field and office-based initiatives to deliver strategic capital projects. Your expertise will be vital to scaling operations safely, efficiently, and on budget.\n\n \n\n\nWHAT YOU'LL DO \n\nProject Ownership & Delivery:\n\n - Take end-to-end ownership of assigned construction projects, ensuring stakeholder satisfaction and identifying cost efficiencies.\n\n - Direct project delivery from scope development and contractor procurement to construction, commissioning, and project close-out.\n\n - Lead project startup activities including forecasting, budgeting, and job cost tracking.\n\n - Manage major purchase orders with thorough pricing and scope reviews.\n\n - Ensure project compliance with Mariana Minerals standards and company policies.\n\nProcurement & Commercial Management:\n\n - Evaluate bids, manage procurement, and negotiate for optimal project outcomes.\n\n - Review plans and technical diagrams to verify all required material and hardware are accounted for.\n\n - Handle change orders and claims, seeking favorable commercial resolution.\n\n - Prepare regular project reports on cost, schedule, risks, and overall quality.\n\nContractor & Stakeholder Management:\n\n - Maintain open communication with cross-functional teams (QC, QA, commissioning, facilities, operations).\n\n - Oversee contractor performance to ensure achievement of KPIs and deliverables.\n\n - Liaise with regulatory, permitting, and community stakeholders as needed.\n\nSystems & Automation:\n\n - Collaborate with software engineering to advance project management tools and support ongoing automation.\n\n - Mentor junior team members and foster a culture of growth and efficiency.\n\nHealth, Safety & Environment:\n\n - Lead a \"zero-harm\" safety culture, conducting regular safety reviews and toolbox talks.\n\n - Ensure alignment with all HSE plans and regulatory requirements.\n\n - Monitor and manage environmental controls (dust, water, waste) during construction.\n\n \n\n\nWHAT YOU'LL BRING\n\n - Bachelor’s degree in Construction Management, Engineering, or related field; or equivalent experience.\n\n - 8+ years in construction project management in industrial/mining/processing plants.\n\n - Demonstrated success delivering capital projects of $20M+ on schedule and within budget.\n\n - Skilled in Primavera P6, Microsoft Project, Office Suite, accounting, and estimating tools.\n\n - Proficient at reading and interpreting contracts, engineering documentation, and specifications.\n\n - Strong knowledge of construction practices, industry codes, procurement, electrical fundamentals, and accounting.\n\n - Excellent communication, judgment, and decision-making abilities in dynamic environments.\n\n - Willingness to travel up to 50% to project sites or offices.\n\n - Experience with EPC/EPCM delivery models highly desirable.\n\n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"d47156a6-0ac7-4940-bf22-ed8c856dc002","title":"Sr. Data Engineer ","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"Ann Arbor, MI","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"San Francisco HQ","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}}}],"publishedAt":"2026-06-10T23:55:51.556+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/d47156a6-0ac7-4940-bf22-ed8c856dc002","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/d47156a6-0ac7-4940-bf22-ed8c856dc002/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is building the critical minerals supply chain from the ground up—and we're looking for a Senior Data Engineer to help make it autonomous.
We're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027.
As a Senior Data Engineer at Mariana, you'll own a data domain end-to-end—designing the pipelines, schemas, and contracts that make a whole class of plant data trustworthy and queryable. The systems you build are the foundation every model and every operational decision depends on.
This is some of the most interesting applied data work happening today.
Our internal platform, PlantOS, uses the same reinforcement learning toolkits that power self-driving vehicles and humanoid robots—but applied to autonomous, short-interval control of mineral refining circuits. None of it works without data: every set point those models adjust, and every decision we make about a plant, rests on turning messy industrial reality into trustworthy, queryable, model-ready data.
The environment is noisy and non-stationary: sensors drift, lab results arrive late and malformed, wastewater compositions shift, equipment ages. The data backbone has to keep up. The end goal is fully autonomous refining operations—and the pipelines you build are the foundation everything else stands on.
Work across domains—for example, all plant sensor and historian data, or all lab and analytical results—including schema design, orchestration, reliability, and the contract it exposes to everyone downstream.
Design and evolve our fleet of pipelines that pull from messy industrial sources—sensors, lab systems, historians, imagery, and more—into our databases and warehouse.
Model time-series and analytical plant data for both human analysis and machine learning training, validation, and monitoring; own data quality, observability, and lineage in your domain.
Build the data architecture that feeds production ML—the training and monitoring layer—in partnership with the ML engineers who own the model-specific semantics.
Mentor earlier-career engineers and define the data contracts other teams build against.
Work the boundary with machine learning deliberately: you own the platform and the interface it exposes; ML engineers own the features and models built on top of it. The training and monitoring layer is shared ground you design together.
4-8+ years in data engineering or a closely related role.
Strong Python and SQL, with deep experience designing database and warehouse schemas, including time-series and/or analytical data.
Proven experience building reliable, orchestrated data pipelines and operating them in the cloud with containers and CI/CD.
Experience with data quality, observability, and lineage, and comfort with messy real-world sources—drifting sensors, malformed exports, and the quirks of industrial systems.
A self-starter comfortable in high-ambiguity environments, working directly with process engineers, ML engineers, and operations teams.
Bonus: experience feeding data to ML systems—training datasets, feature pipelines, model monitoring—or working with industrial, sensor, or historian data.
We own the projects, generate the data, and close the loop. Every facility we build makes the software smarter—and the next facility faster and cheaper.
Mining is one of the last major industrial sectors that hasn't been rebuilt with modern software. The opportunity here isn't a feature gap—it's entire workflows and systems that don't exist yet.
Your work will directly shape how critical minerals are produced at scale in the coming decades.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is building the critical minerals supply chain from the ground up—and we're looking for a Senior Data Engineer to help make it autonomous.\n\nWe're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027.\n\nAs a Senior Data Engineer at Mariana, you'll own a data domain end-to-end—designing the pipelines, schemas, and contracts that make a whole class of plant data trustworthy and queryable. The systems you build are the foundation every model and every operational decision depends on.\n\n\n\n\nTHE TECH\n\nThis is some of the most interesting applied data work happening today.\n\nOur internal platform, PlantOS, uses the same reinforcement learning toolkits that power self-driving vehicles and humanoid robots—but applied to autonomous, short-interval control of mineral refining circuits. None of it works without data: every set point those models adjust, and every decision we make about a plant, rests on turning messy industrial reality into trustworthy, queryable, model-ready data.\n\nThe environment is noisy and non-stationary: sensors drift, lab results arrive late and malformed, wastewater compositions shift, equipment ages. The data backbone has to keep up. The end goal is fully autonomous refining operations—and the pipelines you build are the foundation everything else stands on.\n\n \n\n\nWHAT YOU’LL DO\n\n - Work across domains—for example, all plant sensor and historian data, or all lab and analytical results—including schema design, orchestration, reliability, and the contract it exposes to everyone downstream.\n\n - Design and evolve our fleet of pipelines that pull from messy industrial sources—sensors, lab systems, historians, imagery, and more—into our databases and warehouse.\n\n - Model time-series and analytical plant data for both human analysis and machine learning training, validation, and monitoring; own data quality, observability, and lineage in your domain.\n\n - Build the data architecture that feeds production ML—the training and monitoring layer—in partnership with the ML engineers who own the model-specific semantics.\n\n - Mentor earlier-career engineers and define the data contracts other teams build against.\n\n - Work the boundary with machine learning deliberately: you own the platform and the interface it exposes; ML engineers own the features and models built on top of it. The training and monitoring layer is shared ground you design together.\n \n \n\n\nDESIRED QUALIFICATIONS\n\n - 4-8+ years in data engineering or a closely related role.\n\n - Strong Python and SQL, with deep experience designing database and warehouse schemas, including time-series and/or analytical data.\n\n - Proven experience building reliable, orchestrated data pipelines and operating them in the cloud with containers and CI/CD.\n\n - Experience with data quality, observability, and lineage, and comfort with messy real-world sources—drifting sensors, malformed exports, and the quirks of industrial systems.\n\n - A self-starter comfortable in high-ambiguity environments, working directly with process engineers, ML engineers, and operations teams.\n\n - Bonus: experience feeding data to ML systems—training datasets, feature pipelines, model monitoring—or working with industrial, sensor, or historian data.\n \n \n\n\nWHY THIS ROLE\n\nWe own the projects, generate the data, and close the loop. Every facility we build makes the software smarter—and the next facility faster and cheaper.\n\nMining is one of the last major industrial sectors that hasn't been rebuilt with modern software. The opportunity here isn't a feature gap—it's entire workflows and systems that don't exist yet.\n\nYour work will directly shape how critical minerals are produced at scale in the coming decades.\n\n\n\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $200K","compensationTiers":[{"id":"3c247043-6488-454e-9064-8fec14e51e83","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"9ea6f0f2-e7e9-457b-81d6-63f864117e8f","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000},{"id":"236d8c5a-84c2-4ec1-a7a2-a365e36e0b2a","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"44c92dd6-55f2-4e44-9360-bf4676466dac","title":"Machine Learning Engineer ","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"Ann Arbor, MI","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"San Francisco HQ","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}}}],"publishedAt":"2026-06-10T23:57:00.023+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/44c92dd6-55f2-4e44-9360-bf4676466dac","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/44c92dd6-55f2-4e44-9360-bf4676466dac/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is building the critical minerals supply chain from the ground up—and we're looking for Machine Learning Engineers to help make it autonomous.
We're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027.
As a Machine Learning Engineer at Mariana, you'll help build and improve the machine learning systems that control our mineral refining facilities. You'll start with well-scoped problems inside our simulators and training pipelines—and ramp quickly toward owning models that run on real, operating plants. Your work won't live behind dashboards or proxy metrics; you'll see its impact in real recovery rates, energy consumption, reagent usage, and uptime.
This is some of the most interesting applied AI work happening today.
Our internal platform uses the same reinforcement learning toolkits that power self-driving vehicles and humanoid robots—but applied to autonomous, short-interval control of mineral refining circuits. Models adjust operating set points and configurations in real time, optimizing across lithium recovery, reagent consumption, energy intensity, and equipment uptime simultaneously.
The environment is noisy and non-stationary: wastewater compositions shift, ore grades change, equipment ages. The system must continuously adapt. The end goal is fully autonomous refining operations. When you ship here, you can literally watch the physics change.
Under the hood, that means training control models inside physically realistic simulators of our process units, then closing the gap against real plant data before anything touches live equipment.
Run reinforcement learning experiments in our physically realistic simulators of mineral processing operations, and help turn the results into better controllers.
Build and refine pieces of our training environments—reward functions, observations, and action logic—with guidance from senior engineers.
Train control models, track and interpret their performance, and dig into why a model underperforms.
Help close the gap between simulation and reality by comparing model behavior against real plant data and flagging where the physics diverges.
Write clean, well-tested code and contribute to the services that put models into production.
Partner with process and chemistry experts to understand the unit operations you're modeling.
2-8+ years of experience (including internships or research) in machine learning, reinforcement learning, or scientific computing—or a strong recent graduate with demonstrated project depth.
Solid grounding in machine learning fundamentals, with working knowledge of modern deep learning; exposure to reinforcement learning is a strong plus.
Proficiency in Python and comfort reading and debugging an existing codebase.
Curiosity about physical, industrial systems and eagerness to learn chemistry and process engineering from experts who will challenge your assumptions.
A self-starter who asks good questions, ships, and escalates blockers early.
We own the projects, generate the data, and close the loop. Every facility we build makes the software smarter—and the next facility faster and cheaper.
Mining is one of the last major industrial sectors that hasn't been rebuilt with modern software. The opportunity here isn't a feature gap—it's entire workflows and systems that don't exist yet.
Your work will directly shape how critical minerals are produced at scale in the coming decades.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is building the critical minerals supply chain from the ground up—and we're looking for Machine Learning Engineers to help make it autonomous.\n\nWe're not a software company selling tools to mining operators. We are a mining company that builds software. Mariana designs, builds, commissions, and operates our own mines and refineries. We develop proprietary chemical processes and run them at lab, pilot, and commercial scale. Today, we're producing battery-grade lithium salts from real oil and gas wastewater in our facilities. Our first commercial-scale lithium production facility, Lithium One, is targeting initial production in Q1 of 2027.\n\nAs a Machine Learning Engineer at Mariana, you'll help build and improve the machine learning systems that control our mineral refining facilities. You'll start with well-scoped problems inside our simulators and training pipelines—and ramp quickly toward owning models that run on real, operating plants. Your work won't live behind dashboards or proxy metrics; you'll see its impact in real recovery rates, energy consumption, reagent usage, and uptime.\n\n \n\n\nTHE TECH\n\nThis is some of the most interesting applied AI work happening today.\n\nOur internal platform uses the same reinforcement learning toolkits that power self-driving vehicles and humanoid robots—but applied to autonomous, short-interval control of mineral refining circuits. Models adjust operating set points and configurations in real time, optimizing across lithium recovery, reagent consumption, energy intensity, and equipment uptime simultaneously.\n\nThe environment is noisy and non-stationary: wastewater compositions shift, ore grades change, equipment ages. The system must continuously adapt. The end goal is fully autonomous refining operations. When you ship here, you can literally watch the physics change.\n\nUnder the hood, that means training control models inside physically realistic simulators of our process units, then closing the gap against real plant data before anything touches live equipment.\n\n \n\n\nWHAT YOU’LL DO\n\n - Run reinforcement learning experiments in our physically realistic simulators of mineral processing operations, and help turn the results into better controllers.\n\n - Build and refine pieces of our training environments—reward functions, observations, and action logic—with guidance from senior engineers.\n\n - Train control models, track and interpret their performance, and dig into why a model underperforms.\n\n - Help close the gap between simulation and reality by comparing model behavior against real plant data and flagging where the physics diverges.\n\n - Write clean, well-tested code and contribute to the services that put models into production.\n\n - Partner with process and chemistry experts to understand the unit operations you're modeling.\n \n \n\n\nDESIRED QUALIFICATIONS\n\n - 2-8+ years of experience (including internships or research) in machine learning, reinforcement learning, or scientific computing—or a strong recent graduate with demonstrated project depth.\n\n - Solid grounding in machine learning fundamentals, with working knowledge of modern deep learning; exposure to reinforcement learning is a strong plus.\n\n - Proficiency in Python and comfort reading and debugging an existing codebase.\n\n - Curiosity about physical, industrial systems and eagerness to learn chemistry and process engineering from experts who will challenge your assumptions.\n\n - A self-starter who asks good questions, ships, and escalates blockers early.\n \n \n\n\nWHY THIS ROLE\n\nWe own the projects, generate the data, and close the loop. Every facility we build makes the software smarter—and the next facility faster and cheaper.\n\nMining is one of the last major industrial sectors that hasn't been rebuilt with modern software. The opportunity here isn't a feature gap—it's entire workflows and systems that don't exist yet.\n\nYour work will directly shape how critical minerals are produced at scale in the coming decades.\n\n\n\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$120K – $180K • Offers Equity","scrapeableCompensationSalarySummary":"$120K - $180K","compensationTiers":[{"id":"efe4547b-b0c7-4abc-9776-3266323b5e6f","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $120K – $180K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"57f166bd-9013-4041-b847-49547c8b222e","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"89ea0593-1769-4eaf-b994-f7702478906c","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $120K – $180K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":120000,"maxValue":180000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":120000,"maxValue":180000}]}},{"id":"f3f189d1-763d-4196-9ef9-5a7e7931e71b","title":"Staff Machine Learning Engineer ","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"Ann Arbor, MI","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-06-10T23:58:01.777+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/f3f189d1-763d-4196-9ef9-5a7e7931e71b","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/f3f189d1-763d-4196-9ef9-5a7e7931e71b/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Our control systems can only act on what the plant knows about itself, and this role is responsible for most of that knowledge. The work includes:
Reinforcement learning agents that learn to control our processes in simulation
Time-series models for forecasting and detection
Vision systems that measure things no instrument can
Soft sensors that estimate lab results we can't get back fast enough
Classifiers that flag faults early
You'll set technical direction for applied ML across our sites and build much of it yourself, from data to deployment. The scope is wide on purpose. We care more about range and good judgment than deep expertise in any single technique.
Deciding where ML is worth it. Some problems need a model and many don't. You'll help us put effort where it improves recovery, uptime, or cost.
Time-series work: forecasting, anomaly and excursion detection, predictive maintenance, and soft sensors.
Computer vision on circuits, conveyors, and equipment. Expect poor lighting, vibration, and dirty lenses.
Classification and diagnostics for faults, product quality, and process state. Labels are rare, classes are imbalanced, and some mistakes cost far more than others.
Setting the deployment bar for each model and running the validation that gets it from a notebook into the control room, where operators rely on it during their shift.
Writing the team's modeling standards, reviewing designs, and mentoring engineers at every level.
Working closely with two teams:
The autonomy and controls team, whose controllers use your predictions.
Data engineering, who own the platform underneath.
Reinforcement learning in our process simulators, training agents to learn how to control each circuit and taking what works from simulation onto the real plant.
8 to 10+ years in ML engineering, or 6+ with clear org-level technical leadership. You've put models into production in the physical world and kept them running.
Shipped work in at least two of these areas: time-series, computer vision, reinforcement learning, and classical supervised learning. You can pick up a third quickly, and you can tell which one a problem actually needs.
Experience with industrial sensor data: historians, SCADA/DCS, OPC-UA, or similar.
Experience with scarce labels, drift, and rare events. You report how uncertain a prediction is, not just a single number.
You work well with roboticists, chemists, metallurgists, process engineers, and geologists, and you can bring technical leadership along with you.
You like building. Staff engineers here ship.
We own our projects and generate our own data, so what you build feeds straight back into operations. Each new facility adds to that data and makes the next one quicker and cheaper to build.
In most applied ML jobs, someone hands you a cleaned dataset and a metric. Here you get a plant. You figure out what needs measuring, build the thing that measures it, and see whether the numbers move.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nABOUT THE ROLE\n\nOur control systems can only act on what the plant knows about itself, and this role is responsible for most of that knowledge. The work includes:\n\n - Reinforcement learning agents that learn to control our processes in simulation\n\n - Time-series models for forecasting and detection\n\n - Vision systems that measure things no instrument can\n\n - Soft sensors that estimate lab results we can't get back fast enough\n\n - Classifiers that flag faults early\n\nYou'll set technical direction for applied ML across our sites and build much of it yourself, from data to deployment. The scope is wide on purpose. We care more about range and good judgment than deep expertise in any single technique.\n\n\n\n\nWHAT YOU'LL WORK ON\n\n - Deciding where ML is worth it. Some problems need a model and many don't. You'll help us put effort where it improves recovery, uptime, or cost.\n\n - Time-series work: forecasting, anomaly and excursion detection, predictive maintenance, and soft sensors.\n\n - Computer vision on circuits, conveyors, and equipment. Expect poor lighting, vibration, and dirty lenses.\n\n - Classification and diagnostics for faults, product quality, and process state. Labels are rare, classes are imbalanced, and some mistakes cost far more than others.\n\n - Setting the deployment bar for each model and running the validation that gets it from a notebook into the control room, where operators rely on it during their shift.\n\n - Writing the team's modeling standards, reviewing designs, and mentoring engineers at every level.\n\n - Working closely with two teams:\n \n - The autonomy and controls team, whose controllers use your predictions.\n \n - Data engineering, who own the platform underneath.\n\n - Reinforcement learning in our process simulators, training agents to learn how to control each circuit and taking what works from simulation onto the real plant.\n \n \n\n\nWHAT WE'RE LOOKING FOR\n\n - 8 to 10+ years in ML engineering, or 6+ with clear org-level technical leadership. You've put models into production in the physical world and kept them running.\n\n - Shipped work in at least two of these areas: time-series, computer vision, reinforcement learning, and classical supervised learning. You can pick up a third quickly, and you can tell which one a problem actually needs.\n\n - Experience with industrial sensor data: historians, SCADA/DCS, OPC-UA, or similar.\n\n - Experience with scarce labels, drift, and rare events. You report how uncertain a prediction is, not just a single number.\n\n - You work well with roboticists, chemists, metallurgists, process engineers, and geologists, and you can bring technical leadership along with you.\n\n - You like building. Staff engineers here ship.\n \n \n\n\nWHY JOIN\n\nWe own our projects and generate our own data, so what you build feeds straight back into operations. Each new facility adds to that data and makes the next one quicker and cheaper to build.\n\nIn most applied ML jobs, someone hands you a cleaned dataset and a metric. Here you get a plant. You figure out what needs measuring, build the thing that measures it, and see whether the numbers move.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$160K – $240K • Offers Equity","scrapeableCompensationSalarySummary":"$160K - $240K","compensationTiers":[{"id":"a2051066-99db-462e-982b-db2fe347da63","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $160K – $240K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"b2d761bc-4345-44fb-8633-4975ea4cac69","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"02058d1f-a94f-4e56-b967-2b54eb229e67","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $160K – $240K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":160000,"maxValue":240000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":160000,"maxValue":240000}]}},{"id":"92035e6a-a6fb-40a9-af31-5b8c25e9cc53","title":"Staff Product Manager, Engineering & Construction","department":"Product Development","team":"Product Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-09-17T04:48:41.093+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/92035e6a-a6fb-40a9-af31-5b8c25e9cc53","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/92035e6a-a6fb-40a9-af31-5b8c25e9cc53/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We're hiring a Staff Product Manager to own the Engineering and Super domains of CapitalProjectOS (CPOS), the operating system for how Mariana designs, plans, and builds capital projects. CPOS is organized around four components ( MarianaEngineer (design), MarianaGSM (procurement), MarianaSuper (construction), and MarianaPM (planning and monitoring)) and this role owns two of them end-to-end: MarianaEngineer, the centralized system for design basis, process and engineering data, and 3D models; and MarianaSuper, the real-time command center for construction execution and plan-versus-actual tracking in the field.
You will be the single accountable owner for product strategy, roadmap, and execution across engineering and construction, working alongside PMs who own procurement (GSM) and planning/knowledge (PM) within the same CPOS team. The ideal candidate has hands-on experience in capital project engineering or construction/field execution and is energized by the challenge of embedding AI into workflows that engineers and superintendents depend on every day.
Own the product vision, roadmap, and prioritization for MarianaEngineer and MarianaSuper, including agentic tooling such as engineering automation, reality capture, and plan-versus-actual intelligence.
Serve as the primary domain expert translating capital project engineering and construction workflows into software requirements. You will act as the the bridge between project engineers, superintendents, project controls, software engineering, and executive stakeholders.
Embed directly with engineering and field teams to understand how design and construction work actually happens, anticipate edge cases, and distinguish true product requirements from one-off user preferences or process gaps.
Write clear requirements, user stories, acceptance criteria, and business rules; build and test prototypes to hone in on valuable products as quickly as possible.
Build a structured user engagement model (discovery sessions, workflow reviews, sprint reviews, UAT, and adoption check-ins) that makes users accountable for feedback, testing, and adoption.
Develop rollout plans, training materials, adoption metrics, and feedback loops; track adoption barriers and work with engineering and construction leaders to resolve them.
Define and track success metrics: modeling and design turnaround time, C4 and reality-capture adoption, plan-versus-actual accuracy, cycle time, and downstream project outcomes (schedule, cost, safety).
Participate in sprint planning, backlog grooming, and retrospectives; maintain a well-prioritized backlog.
Create visibility into what is being built, why it matters, and how it is performing.
Help build the PM function at an AI company. This is a small, early team where you'll help establish how we work and develop PMs behind you at a company at the cutting edge of developing and adopting AI.
Must Have
5+ years of experience in capital project engineering (process, mechanical, or EPC design) and/or construction or field execution (superintendent, construction management, project controls).
Strong understanding of the capital project lifecycle including design basis, engineering deliverables, procurement handoff, construction execution, and commissioning.
Ability to go deep on engineering and construction workflows and earn credibility with domain experts by understanding how the work actually happens.
Strong product judgment: ruthless prioritization, focus on highest-leverage work, resistance to building everything at once.
Ability to translate complex operational workflows into clear requirements, priorities, and product decisions, and to lead cross-functional teams through ambiguous, complex projects with competing stakeholder priorities.
Genuine interest in AI-powered tooling. You know how to translate model capabilities into products that engineers and superintendents will trust and adopt, and you enjoy staying current on the cutting edge of AI advancements.
Strong communication skills across a wide range of organizational contexts, from field superintendents and engineers to executives.
Nice to Have
Direct experience with engineering software (P&ID, 3D/plant design, datasheet or equipment-sizing tools) or construction management software (scheduling, QA/QC, reality capture, command-center platforms).
Experience shipping AI-powered enterprise tools: agentic engineering workflows, document intelligence, or process co-pilots.
Track record of digital transformation in capital-intensive industries — mining, energy, construction, or manufacturing.
Prior product management experience, or genuine excitement to move into product management from an engineering or construction background.
AI-forward projects outside of work.
At Mariana, you don't need to validate product-market fit because we are the market. If you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle.
MarianaEngineer and MarianaSuper are the platforms that determine whether Mariana's designs move from design basis to 3D model without drifting out of sync, and whether the field catches a schedule or quality problem in real time instead of in a monthly report. The engineering tools you build set the authoritative source of truth for every project. The command center you build is what a superintendent looks at every morning to run the site.
If you want to own something end-to-end, build software with immediate operational impact, and help shape what a modern industrial company looks like from the inside out — we'd love to talk.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe're hiring a Staff Product Manager to own the Engineering and Super domains of CapitalProjectOS (CPOS), the operating system for how Mariana designs, plans, and builds capital projects. CPOS is organized around four components ( MarianaEngineer (design), MarianaGSM (procurement), MarianaSuper (construction), and MarianaPM (planning and monitoring)) and this role owns two of them end-to-end: MarianaEngineer, the centralized system for design basis, process and engineering data, and 3D models; and MarianaSuper, the real-time command center for construction execution and plan-versus-actual tracking in the field.\n\nYou will be the single accountable owner for product strategy, roadmap, and execution across engineering and construction, working alongside PMs who own procurement (GSM) and planning/knowledge (PM) within the same CPOS team. The ideal candidate has hands-on experience in capital project engineering or construction/field execution and is energized by the challenge of embedding AI into workflows that engineers and superintendents depend on every day.\n\n\n\n\nWHAT YOU'LL DO\n\n - Own the product vision, roadmap, and prioritization for MarianaEngineer and MarianaSuper, including agentic tooling such as engineering automation, reality capture, and plan-versus-actual intelligence.\n\n - Serve as the primary domain expert translating capital project engineering and construction workflows into software requirements. You will act as the the bridge between project engineers, superintendents, project controls, software engineering, and executive stakeholders.\n\n - Embed directly with engineering and field teams to understand how design and construction work actually happens, anticipate edge cases, and distinguish true product requirements from one-off user preferences or process gaps.\n\n - Write clear requirements, user stories, acceptance criteria, and business rules; build and test prototypes to hone in on valuable products as quickly as possible.\n\n - Build a structured user engagement model (discovery sessions, workflow reviews, sprint reviews, UAT, and adoption check-ins) that makes users accountable for feedback, testing, and adoption.\n\n - Develop rollout plans, training materials, adoption metrics, and feedback loops; track adoption barriers and work with engineering and construction leaders to resolve them.\n\n - Define and track success metrics: modeling and design turnaround time, C4 and reality-capture adoption, plan-versus-actual accuracy, cycle time, and downstream project outcomes (schedule, cost, safety).\n\n - Participate in sprint planning, backlog grooming, and retrospectives; maintain a well-prioritized backlog.\n\n - Create visibility into what is being built, why it matters, and how it is performing.\n\n - Help build the PM function at an AI company. This is a small, early team where you'll help establish how we work and develop PMs behind you at a company at the cutting edge of developing and adopting AI.\n \n \n\n\nDESIRED QUALIFICATIONS\n\nMust Have\n\n - 5+ years of experience in capital project engineering (process, mechanical, or EPC design) and/or construction or field execution (superintendent, construction management, project controls).\n\n - Strong understanding of the capital project lifecycle including design basis, engineering deliverables, procurement handoff, construction execution, and commissioning.\n\n - Ability to go deep on engineering and construction workflows and earn credibility with domain experts by understanding how the work actually happens.\n\n - Strong product judgment: ruthless prioritization, focus on highest-leverage work, resistance to building everything at once.\n\n - Ability to translate complex operational workflows into clear requirements, priorities, and product decisions, and to lead cross-functional teams through ambiguous, complex projects with competing stakeholder priorities.\n\n - Genuine interest in AI-powered tooling. You know how to translate model capabilities into products that engineers and superintendents will trust and adopt, and you enjoy staying current on the cutting edge of AI advancements.\n\n - Strong communication skills across a wide range of organizational contexts, from field superintendents and engineers to executives.\n\nNice to Have\n\n - Direct experience with engineering software (P&ID, 3D/plant design, datasheet or equipment-sizing tools) or construction management software (scheduling, QA/QC, reality capture, command-center platforms).\n\n - Experience shipping AI-powered enterprise tools: agentic engineering workflows, document intelligence, or process co-pilots.\n\n - Track record of digital transformation in capital-intensive industries — mining, energy, construction, or manufacturing.\n\n - Prior product management experience, or genuine excitement to move into product management from an engineering or construction background.\n\n - AI-forward projects outside of work.\n \n \n\n\nWHY THIS ROLE\n\nAt Mariana, you don't need to validate product-market fit because we are the market. If you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle.\n\nMarianaEngineer and MarianaSuper are the platforms that determine whether Mariana's designs move from design basis to 3D model without drifting out of sync, and whether the field catches a schedule or quality problem in real time instead of in a monthly report. The engineering tools you build set the authoritative source of truth for every project. The command center you build is what a superintendent looks at every morning to run the site.\n\nIf you want to own something end-to-end, build software with immediate operational impact, and help shape what a modern industrial company looks like from the inside out — we'd love to talk.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$180K – $210K • Offers Equity","scrapeableCompensationSalarySummary":"$180K - $210K","compensationTiers":[{"id":"5230bdb9-4e7b-43bc-8b30-f5fc9f7f8677","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $180K – $210K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"59910bf4-1a0f-4079-89c9-d3eb7f6ef8bc","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $180K – $210K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":210000},{"id":"83d36b63-d722-435d-a47c-e09757b9cf2b","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":210000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"4b1df422-da52-4c14-92e1-cff19ca8a835","title":"Head of Engineering Programs","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-06-26T16:30:11.459+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/4b1df422-da52-4c14-92e1-cff19ca8a835","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/4b1df422-da52-4c14-92e1-cff19ca8a835/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring a Head of Engineering Programs to lead the planning, coordination, and execution of Mariana’s capital project programs from development through construction.
In this role, you will own the overall program—driving schedules, budgets, and execution across the full project lifecycle while managing the critical interfaces between process development, process engineering, detailed engineering, construction, business development, finance, and more. You will lead a team of Technical Program Managers who keep workstreams aligned, surface risks early, and ensure decisions move quickly across functions. You will also heavily support the development and deployment of Mariana’s capital-project operating system—the software tools that automate and standardize how we plan, track, and execute programs—and drive their adoption across every program. This is a high-leverage leadership role at the intersection of program management, engineering, and software, central to how Mariana scales project delivery.
Own end-to-end execution of Mariana’s capital project engineering, driving overall schedule, budget, and delivery from development through construction and handover to operations
Lead and grow a team of Technical Program Managers, setting priorities, standards, and ways of working across active programs
Manage coordination and interfaces across process development, process engineering, detailed engineering, construction, business development, finance, and other functions to keep programs aligned and decisions moving quickly
Own integrated program schedules and budgets, tracking critical path, interdependencies, and resource needs, and proactively surfacing and mitigating risks
Drive cross-functional execution planning, reviews, and reporting to give leadership clear visibility into program status, risks, and trade-offs
Support the development of Mariana’s capital-project operating-system software tools, partnering with software and engineering teams to define requirements and workflows
Drive deployment and adoption of these tools across all programs, ensuring teams use them consistently to plan, track, and execute work
Establish and standardize Mariana’s project development and execution strategies
Partner with finance and business development on capital allocation, project economics, and investment decisions, ensuring program plans align with company strategy
Continuously improve program-management processes, templates, and metrics to scale project delivery as the portfolio grow
Bachelor’s degree in Engineering or a related technical field
10+ years of experience leading program or project management for large, complex capital projects in mining, minerals processing, chemical, energy, or heavy-industrial environments
Experience defining, deploying, and driving adoption of project management or capital-project software tools and digital workflows
Excellent cross-functional communication and stakeholder management skills, with comfort operating in a fast-moving, first principles-driven environment
Experience supporting construction, commissioning, and field execution preferred
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nWe are hiring a Head of Engineering Programs to lead the planning, coordination, and execution of Mariana’s capital project programs from development through construction.\n\nIn this role, you will own the overall program—driving schedules, budgets, and execution across the full project lifecycle while managing the critical interfaces between process development, process engineering, detailed engineering, construction, business development, finance, and more. You will lead a team of Technical Program Managers who keep workstreams aligned, surface risks early, and ensure decisions move quickly across functions. You will also heavily support the development and deployment of Mariana’s capital-project operating system—the software tools that automate and standardize how we plan, track, and execute programs—and drive their adoption across every program. This is a high-leverage leadership role at the intersection of program management, engineering, and software, central to how Mariana scales project delivery.\n\n\n\n\nWHAT YOU’LL DO\n\n - Own end-to-end execution of Mariana’s capital project engineering, driving overall schedule, budget, and delivery from development through construction and handover to operations\n\n - Lead and grow a team of Technical Program Managers, setting priorities, standards, and ways of working across active programs\n\n - Manage coordination and interfaces across process development, process engineering, detailed engineering, construction, business development, finance, and other functions to keep programs aligned and decisions moving quickly\n\n - Own integrated program schedules and budgets, tracking critical path, interdependencies, and resource needs, and proactively surfacing and mitigating risks\n\n - Drive cross-functional execution planning, reviews, and reporting to give leadership clear visibility into program status, risks, and trade-offs\n\n - Support the development of Mariana’s capital-project operating-system software tools, partnering with software and engineering teams to define requirements and workflows\n\n - Drive deployment and adoption of these tools across all programs, ensuring teams use them consistently to plan, track, and execute work\n\n - Establish and standardize Mariana’s project development and execution strategies\n\n - Partner with finance and business development on capital allocation, project economics, and investment decisions, ensuring program plans align with company strategy\n\n - Continuously improve program-management processes, templates, and metrics to scale project delivery as the portfolio grow\n\n \n\n\nWHAT YOU’LL BRING\n\n - Bachelor’s degree in Engineering or a related technical field\n\n - 10+ years of experience leading program or project management for large, complex capital projects in mining, minerals processing, chemical, energy, or heavy-industrial environments\n\n - Experience defining, deploying, and driving adoption of project management or capital-project software tools and digital workflows\n\n - Excellent cross-functional communication and stakeholder management skills, with comfort operating in a fast-moving, first principles-driven environment\n\n - Experience supporting construction, commissioning, and field execution preferred\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$180K – $240K • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$180K - $240K","compensationTiers":[{"id":"eb32eae3-5232-41cb-bf01-01de87cb3c8b","tierSummary":"$180K – $240K • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"64808c2e-c786-4379-8e3a-8453bbb46d21","summary":"$180K – $240K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":240000}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":240000}]}},{"id":"99b1cd19-87ee-4ca3-a304-56a36b46f9c6","title":"Process Maintenance Technician","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-05T23:25:29.739+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/99b1cd19-87ee-4ca3-a304-56a36b46f9c6","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/99b1cd19-87ee-4ca3-a304-56a36b46f9c6/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Through its Copper One platform, Mariana Minerals owns and operates Lisbon Valley Mining Company, a producing open-pit copper mine in southeastern Utah running 24/7.
As a Process Maintenance Technician, you'll maintain and repair everything that's \"nailed to the ground\": pumps, compressors, boilers, piping, valves, and the buildings that keep the operation running. The ideal candidate is strong in at least one area, such as pumps, welding, or troubleshooting, and is ready to cross-train in the rest.
Diagnose, install, and repair fixed plant equipment, including pumps, compressors, boilers, fans, motors, gearboxes, piping, valves, and automated valves, identifying root causes.
Maintain site buildings and infrastructure, including truck shops, admin buildings, and plumbing systems, along with portable equipment such as mobile air compressors and pumps.
Perform welding and fabrication for pipe, frames, handrails, grating, and structural repairs.
Perform equipment rebuilds, component replacements, lubrication, inspections, oil sampling, and other preventive and condition-based maintenance.
Perform basic electrical troubleshooting and repair on motors, starters, and controls, and work alongside electricians to rack out, unwire, install, and troubleshoot process equipment.
Safely operate forklifts, overhead cranes, boom trucks, and other material-handling equipment.
Document inspections, repairs, and parts in work orders and the CMMS.
Follow MSHA regulations, lockout/tagout procedures, PPE requirements, and company SOPs.
Maintenance experience in fixed plant, mining, industrial, or heavy manufacturing environments.
Strong hands-on skills in at least one area: pumps, welding and fabrication (MIG, stick, cutting), or mechanical troubleshooting.
Working knowledge of pumps, motors, gearboxes, piping systems, and mechanical drive systems.
Basic electrical knowledge, including reading wiring diagrams, using a multimeter, and troubleshooting motors and controls. Industrial electrical experience is a plus.
Ability to read and interpret service manuals, parts manuals, schematics, and technical documentation.
Ability to work safely in an active mine environment and perform physically demanding tasks.
Experience using computerized maintenance management systems (CMMS).
Strong communication skills and ability to work effectively with operators, electricians, and support teams.
Schedule: 7 days on / 7 days off, 12-hour shifts.
Housing & Relocation: Housing and relocation assistance options are available.
Able to walk rough terrain, climb, and lift 50+ lbs in all weather conditions.
Exposure to dust, fumes, and chemicals (including sulfuric acid); full PPE required.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThrough its Copper One platform, Mariana Minerals owns and operates Lisbon Valley Mining Company, a producing open-pit copper mine in southeastern Utah running 24/7.\n\nAs a Process Maintenance Technician, you'll maintain and repair everything that's \"nailed to the ground\": pumps, compressors, boilers, piping, valves, and the buildings that keep the operation running. The ideal candidate is strong in at least one area, such as pumps, welding, or troubleshooting, and is ready to cross-train in the rest.\n\n \n\n\nRESPONSIBILITIES\n\n - Diagnose, install, and repair fixed plant equipment, including pumps, compressors, boilers, fans, motors, gearboxes, piping, valves, and automated valves, identifying root causes.\n\n - Maintain site buildings and infrastructure, including truck shops, admin buildings, and plumbing systems, along with portable equipment such as mobile air compressors and pumps.\n\n - Perform welding and fabrication for pipe, frames, handrails, grating, and structural repairs.\n\n - Perform equipment rebuilds, component replacements, lubrication, inspections, oil sampling, and other preventive and condition-based maintenance.\n\n - Perform basic electrical troubleshooting and repair on motors, starters, and controls, and work alongside electricians to rack out, unwire, install, and troubleshoot process equipment.\n\n - Safely operate forklifts, overhead cranes, boom trucks, and other material-handling equipment.\n\n - Document inspections, repairs, and parts in work orders and the CMMS.\n\n - Follow MSHA regulations, lockout/tagout procedures, PPE requirements, and company SOPs.\n\n\nQUALIFICATIONS\n\n - Maintenance experience in fixed plant, mining, industrial, or heavy manufacturing environments.\n\n - Strong hands-on skills in at least one area: pumps, welding and fabrication (MIG, stick, cutting), or mechanical troubleshooting.\n\n - Working knowledge of pumps, motors, gearboxes, piping systems, and mechanical drive systems.\n\n - Basic electrical knowledge, including reading wiring diagrams, using a multimeter, and troubleshooting motors and controls. Industrial electrical experience is a plus.\n\n - Ability to read and interpret service manuals, parts manuals, schematics, and technical documentation.\n\n - Ability to work safely in an active mine environment and perform physically demanding tasks.\n\n - Experience using computerized maintenance management systems (CMMS).\n\n - Strong communication skills and ability to work effectively with operators, electricians, and support teams.\n\n\nWORKING ENVIRONMENT AND SCHEDULE\n\n - Schedule: 7 days on / 7 days off, 12-hour shifts. \n\n - Housing & Relocation: Housing and relocation assistance options are available.\n\n - Able to walk rough terrain, climb, and lift 50+ lbs in all weather conditions.\n\n - Exposure to dust, fumes, and chemicals (including sulfuric acid); full PPE required.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"548b0c93-48a9-45e7-bff8-e2e1f23142f1","title":"Sr./Staff Mechanical Engineer","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-10-07T22:35:27.105+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/548b0c93-48a9-45e7-bff8-e2e1f23142f1","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/548b0c93-48a9-45e7-bff8-e2e1f23142f1/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for a highly motivated Sr./Staff Mechanical Engineer to work on building the critical minerals supply chain to support the world’s energy transition.
As a Mechanical Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also supporting development of software for project execution and plant optimization. You will design, build, and commission mineral processing and metallurgical refining equipment, develop first-principles-based models of refining equipment and processes, and lead equipment scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team. This is a hands-on, first-principles role for an engineer who wants to help build the world’s most advanced minerals refining facilities.
Lead mechanical engineering scopes across project phases—from concept and feasibility through detailed design, procurement, fabrication, installation, and commissioning
Manage vendors throughout the equipment lifecycle—from specification, RFQ, and technical bid evaluation through drawing review and approval, fabrication expediting and inspection (ITP/FAT), delivery, installation and commissioning support, and warranty close-out
Develop site-wide and area-level plant layouts, optimizing equipment arrangement, maintainability access, constructability, safety, and integration with other disciplines
Prepare mechanical equipment specifications, data sheets, and requisition packages for a range of process and solids-handling equipment, and support technical bid evaluations and vendor selection
Perform static equipment design of tanks, silos, bins, pressure vessels, and other stationary equipment, including mechanical sizing, wall/shell thickness, and structural load calculations ensuring code compliance
Conduct finite element analysis (FEA) to validate equipment and component designs for stress, fatigue, thermal, and operational loading conditions
Design, evaluate, and integrate solids-handling and material-conveyance systems, including silos, bins, hoppers, feeders, conveyors, bucket elevators, chutes, and dust-control systems
Support development of 3D models and piping/mechanical interface layouts, ensuring alignment with process, structural, civil, and electrical engineering requirements
Review vendor drawings and calculations, ensuring mechanical design compliance with project requirements, codes, standards, and operability/maintainability expectations
Collaborate with multidisciplinary EPC teams—including process, structural, piping, electrical, instrumentation, and construction management—to deliver cohesive and constructible engineering packages
Provide mechanical engineering support during construction and commissioning, including responding to RFIs, reviewing field changes, and assisting with equipment installation and start-up
Bachelor’s degree in Mechanical Engineering or a related engineering discipline
Strong understanding of engineering fundamentals and demonstrated ability to leverage that understanding to solve challenging problems
Experience preparing and reviewing mechanical equipment specifications, vendor documentation, and engineering deliverables for both brownfield modifications and greenfield facilities
Demonstrated ability to complete static equipment design of tanks, silos, bins, vessels, and other stationary equipment, including code-based mechanical and structural calculations
FEA capabilities—proficiency with finite element analysis tools to validate equipment and component designs for stress, fatigue, and thermal/operational loading
Working knowledge of relevant industry standards and codes, such as ASME and API
Ability to work effectively with cross-functional teams, manage competing priorities, and deliver high-quality engineering packages under schedule constraints
Proficiency in mechanical design software such as AutoCAD
Hands-on experience with solids-handling and conveyance equipment, including: Silos, bins, hoppers, chutes, and bulk storage systems | Feeders (vibratory, belt, screw, rotary, apron) | Conveyor systems (belt, screw, drag/chain, pneumatic, bucket elevators) | Screens, crushers, and material-transfer equipment
Experience with pyrometallurgical processes and equipment, such as rotary kilns, electric arc furnaces, converters, dryers, and flash kilns
Familiarity with industrial and process-industry environments, such as: Mining and mineral processing | Cement, aggregate, or bulk-materials handling | Chemical or industrial manufacturing facilities | Power generation or heavy industrial sectors
Experience with fluids, thermal, and Multiphysics CFD simulations
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nMariana Minerals is looking for a highly motivated Sr./Staff Mechanical Engineer to work on building the critical minerals supply chain to support the world’s energy transition.\n\nAs a Mechanical Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also supporting development of software for project execution and plant optimization. You will design, build, and commission mineral processing and metallurgical refining equipment, develop first-principles-based models of refining equipment and processes, and lead equipment scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team. This is a hands-on, first-principles role for an engineer who wants to help build the world’s most advanced minerals refining facilities.\n\n\n\nWHAT YOU’LL DO\n\n - Lead mechanical engineering scopes across project phases—from concept and feasibility through detailed design, procurement, fabrication, installation, and commissioning\n\n - Manage vendors throughout the equipment lifecycle—from specification, RFQ, and technical bid evaluation through drawing review and approval, fabrication expediting and inspection (ITP/FAT), delivery, installation and commissioning support, and warranty close-out\n\n - Develop site-wide and area-level plant layouts, optimizing equipment arrangement, maintainability access, constructability, safety, and integration with other disciplines\n\n - Prepare mechanical equipment specifications, data sheets, and requisition packages for a range of process and solids-handling equipment, and support technical bid evaluations and vendor selection\n\n - Perform static equipment design of tanks, silos, bins, pressure vessels, and other stationary equipment, including mechanical sizing, wall/shell thickness, and structural load calculations ensuring code compliance\n\n - Conduct finite element analysis (FEA) to validate equipment and component designs for stress, fatigue, thermal, and operational loading conditions\n\n - Design, evaluate, and integrate solids-handling and material-conveyance systems, including silos, bins, hoppers, feeders, conveyors, bucket elevators, chutes, and dust-control systems\n\n - Support development of 3D models and piping/mechanical interface layouts, ensuring alignment with process, structural, civil, and electrical engineering requirements\n\n - Review vendor drawings and calculations, ensuring mechanical design compliance with project requirements, codes, standards, and operability/maintainability expectations\n\n - Collaborate with multidisciplinary EPC teams—including process, structural, piping, electrical, instrumentation, and construction management—to deliver cohesive and constructible engineering packages\n\n - Provide mechanical engineering support during construction and commissioning, including responding to RFIs, reviewing field changes, and assisting with equipment installation and start-up\n \n \n\n\nWHAT YOU’LL BRING\n\n - Bachelor’s degree in Mechanical Engineering or a related engineering discipline\n\n - Strong understanding of engineering fundamentals and demonstrated ability to leverage that understanding to solve challenging problems\n\n - Experience preparing and reviewing mechanical equipment specifications, vendor documentation, and engineering deliverables for both brownfield modifications and greenfield facilities\n\n - Demonstrated ability to complete static equipment design of tanks, silos, bins, vessels, and other stationary equipment, including code-based mechanical and structural calculations\n\n - FEA capabilities—proficiency with finite element analysis tools to validate equipment and component designs for stress, fatigue, and thermal/operational loading\n\n - Working knowledge of relevant industry standards and codes, such as ASME and API\n\n - Ability to work effectively with cross-functional teams, manage competing priorities, and deliver high-quality engineering packages under schedule constraints\n\n - Proficiency in mechanical design software such as AutoCAD\n\n\n\n\nPREFERRED\n\n - Hands-on experience with solids-handling and conveyance equipment, including: Silos, bins, hoppers, chutes, and bulk storage systems | Feeders (vibratory, belt, screw, rotary, apron) | Conveyor systems (belt, screw, drag/chain, pneumatic, bucket elevators) | Screens, crushers, and material-transfer equipment\n\n - Experience with pyrometallurgical processes and equipment, such as rotary kilns, electric arc furnaces, converters, dryers, and flash kilns\n\n - Familiarity with industrial and process-industry environments, such as: Mining and mineral processing | Cement, aggregate, or bulk-materials handling | Chemical or industrial manufacturing facilities | Power generation or heavy industrial sectors\n\n - Experience with fluids, thermal, and Multiphysics CFD simulations\n \n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $175K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","scrapeableCompensationSalarySummary":"$140K - $175K","compensationTiers":[{"id":"10a453f0-1795-45a6-946b-b5e538f91cee","tierSummary":"$140K – $175K • Offers Equity • Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","title":null,"additionalInformation":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors.","components":[{"id":"47a371f5-e81d-482e-98ae-42db998ea8d8","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"a020fb8d-f920-47d6-a5e6-235d17249d60","summary":"$140K – $175K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":175000}]}},{"id":"193fac55-a800-499e-9940-aa60eaa672a0","title":"Process Safety Engineer","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-07-07T21:14:57.697+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/193fac55-a800-499e-9940-aa60eaa672a0","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/193fac55-a800-499e-9940-aa60eaa672a0/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is seeking a Process Safety Management (PSM) Engineer to help build, administer, and continuously improve the company's process safety and major hazard risk management program. This role will support labs, pilot operations, process development, scale-up projects, and future operating facilities by leading structured risk assessments and translating findings into practical engineering, operational, and safety controls.
The PSM Engineer will plan, facilitate, and document PHAs, HAZOPs, HAZIDs, LOPAs, what-if/checklist reviews, bowties, formal risk assessments, MOC reviews, and PSSRs. The role also requires an engineering background capable of informing facility design questions, including hazardous material storage and use, equipment layout, safeguards, process controls, relief/venting concepts, ventilation, detection/alarming, emergency shutdown, life safety, and fire protection design interfaces. You will work closely with Health & Safety, process engineering, pilot operations, facilities, maintenance, consultants, and project teams to ensure hazards are identified early, controls are practical, and risk reduction actions are executed.
While the role is centered on PSM and engineering risk, it will also support broader safety and health initiatives as needed, including incident learning, contractor/project safety, emergency preparedness, field verification, procedure development, training, and continuous improvement of company safety systems.
What You'll Do
Administer PSM and major hazard risk management workflows, including risk study planning, pre-work, facilitation, documentation, action tracking, and closeout verification and assist in development or improvement of processes.
Lead or support PHAs, HAZOPs, HAZIDs, LOPAs, what-if/checklist studies, bowties, formal risk assessments, and other structured reviews for lab, pilot, project, and operating systems and assist in the development of these tools where needed.
Support Management of Change and Pre-Startup Safety Review processes by reviewing technical changes, startup readiness, critical safeguards, training needs, procedures, and open action status.
Review PFDs, P&IDs, equipment specifications, operating envelopes, control narratives, layouts, chemical inventories, and utility interfaces to identify process safety and facility design implications.
Provide practical engineering input on life safety, fire protection, hazardous materials, ventilation, detection/alarming, emergency shutdown, pressure relief, containment, and occupancy or hazard classification questions.
Partner with internal SMEs, external engineers, insurers, and AHJs to clarify applicable code requirements and translate them into actionable design or operational requirements.
Develop and maintain process safety information, hazard registers, safeguard/IPL libraries, action trackers, PSM procedures, risk assessment templates, decision logs, and program metrics.
Evaluate safeguards and risk reduction actions using hierarchy of controls, independent protection layer concepts, reliability assumptions, field verification, and practical implementation constraints.
Support incident investigations, root cause analysis, corrective action development, lessons learned, and verification that systemic risk controls are implemented.
Help embed process safety expectations into project planning, commissioning, operating procedures, training, contractor scopes, field execution, and routine operations.
Support broader Health & Safety initiatives as needed, including HazCom, contractor safety, emergency response planning, field audits, safety observations, training, and procedure development.
Desired Qualifications
B.S. or higher in Chemical Engineering, Mechanical Engineering, Mining Engineering, Metallurgy, Fire Protection Engineering, Safety Engineering, or a related technical discipline.
5+ years of relevant experience in process safety, process engineering, plant design, operations, commissioning, EHS, or risk management in minerals, mining/metallurgy, chemicals, specialty materials, oil & gas, manufacturing, pilot plants, or lab-to-commercial scale-up environments.
Hands-on experience supporting or facilitating PHAs, HAZOPs, HAZIDs, LOPAs, MOC, PSSR, incident investigations, formal risk assessments, or similar structured risk management processes.
Ability to read and interpret PFDs, P&IDs, layouts, equipment data sheets, operating procedures, control narratives, chemical inventories, and safety-critical design information.
Working knowledge of process safety and facility safety requirements such as OSHA PSM, EPA RMP, IFC/IBC concepts, NFPA standards, pressure systems, hazardous materials, electrical safety, fire protection, ventilation, and emergency planning. Deep expertise in every code area is not required, but the candidate must know how to frame questions and work with qualified SMEs.
Strong technical writing, meeting facilitation, action tracking, data organization, and communication skills.
Ability to challenge assumptions constructively, document decisions clearly, and translate risk assessment outputs into practical controls, design inputs, procedures, and field actions.
Comfortable working in fast-paced, ambiguous environments, wearing multiple hats, and balancing program administration with field-facing technical support.
Professional certifications or specialized training such as PE, CSP, CCPSC, CFPS, HAZOP/LOPA facilitation training, or equivalent process safety credentials are a plus.
Experience with pilot plants, lab-scale hazards, scale-up projects, hazardous materials permitting, fire/life safety coordination, commissioning, or operational readiness is a plus.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nMariana Minerals is seeking a Process Safety Management (PSM) Engineer to help build, administer, and continuously improve the company's process safety and major hazard risk management program. This role will support labs, pilot operations, process development, scale-up projects, and future operating facilities by leading structured risk assessments and translating findings into practical engineering, operational, and safety controls.\n\nThe PSM Engineer will plan, facilitate, and document PHAs, HAZOPs, HAZIDs, LOPAs, what-if/checklist reviews, bowties, formal risk assessments, MOC reviews, and PSSRs. The role also requires an engineering background capable of informing facility design questions, including hazardous material storage and use, equipment layout, safeguards, process controls, relief/venting concepts, ventilation, detection/alarming, emergency shutdown, life safety, and fire protection design interfaces. You will work closely with Health & Safety, process engineering, pilot operations, facilities, maintenance, consultants, and project teams to ensure hazards are identified early, controls are practical, and risk reduction actions are executed.\n\nWhile the role is centered on PSM and engineering risk, it will also support broader safety and health initiatives as needed, including incident learning, contractor/project safety, emergency preparedness, field verification, procedure development, training, and continuous improvement of company safety systems.\n\n\n\nWhat You'll Do\n\n - Administer PSM and major hazard risk management workflows, including risk study planning, pre-work, facilitation, documentation, action tracking, and closeout verification and assist in development or improvement of processes.\n\n - Lead or support PHAs, HAZOPs, HAZIDs, LOPAs, what-if/checklist studies, bowties, formal risk assessments, and other structured reviews for lab, pilot, project, and operating systems and assist in the development of these tools where needed.\n\n - Support Management of Change and Pre-Startup Safety Review processes by reviewing technical changes, startup readiness, critical safeguards, training needs, procedures, and open action status.\n\n - Review PFDs, P&IDs, equipment specifications, operating envelopes, control narratives, layouts, chemical inventories, and utility interfaces to identify process safety and facility design implications.\n\n - Provide practical engineering input on life safety, fire protection, hazardous materials, ventilation, detection/alarming, emergency shutdown, pressure relief, containment, and occupancy or hazard classification questions.\n\n - Partner with internal SMEs, external engineers, insurers, and AHJs to clarify applicable code requirements and translate them into actionable design or operational requirements.\n\n - Develop and maintain process safety information, hazard registers, safeguard/IPL libraries, action trackers, PSM procedures, risk assessment templates, decision logs, and program metrics.\n\n - Evaluate safeguards and risk reduction actions using hierarchy of controls, independent protection layer concepts, reliability assumptions, field verification, and practical implementation constraints.\n\n - Support incident investigations, root cause analysis, corrective action development, lessons learned, and verification that systemic risk controls are implemented.\n\n - Help embed process safety expectations into project planning, commissioning, operating procedures, training, contractor scopes, field execution, and routine operations.\n\n - Support broader Health & Safety initiatives as needed, including HazCom, contractor safety, emergency response planning, field audits, safety observations, training, and procedure development.\n\n\n\nDesired Qualifications\n\n - B.S. or higher in Chemical Engineering, Mechanical Engineering, Mining Engineering, Metallurgy, Fire Protection Engineering, Safety Engineering, or a related technical discipline.\n\n - 5+ years of relevant experience in process safety, process engineering, plant design, operations, commissioning, EHS, or risk management in minerals, mining/metallurgy, chemicals, specialty materials, oil & gas, manufacturing, pilot plants, or lab-to-commercial scale-up environments.\n\n - Hands-on experience supporting or facilitating PHAs, HAZOPs, HAZIDs, LOPAs, MOC, PSSR, incident investigations, formal risk assessments, or similar structured risk management processes.\n\n - Ability to read and interpret PFDs, P&IDs, layouts, equipment data sheets, operating procedures, control narratives, chemical inventories, and safety-critical design information.\n\n - Working knowledge of process safety and facility safety requirements such as OSHA PSM, EPA RMP, IFC/IBC concepts, NFPA standards, pressure systems, hazardous materials, electrical safety, fire protection, ventilation, and emergency planning. Deep expertise in every code area is not required, but the candidate must know how to frame questions and work with qualified SMEs.\n\n - Strong technical writing, meeting facilitation, action tracking, data organization, and communication skills.\n\n - Ability to challenge assumptions constructively, document decisions clearly, and translate risk assessment outputs into practical controls, design inputs, procedures, and field actions.\n\n - Comfortable working in fast-paced, ambiguous environments, wearing multiple hats, and balancing program administration with field-facing technical support.\n\n - Professional certifications or specialized training such as PE, CSP, CCPSC, CFPS, HAZOP/LOPA facilitation training, or equivalent process safety credentials are a plus.\n\n - Experience with pilot plants, lab-scale hazards, scale-up projects, hazardous materials permitting, fire/life safety coordination, commissioning, or operational readiness is a plus.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"e50c73d9-f49c-482d-8810-31b67d9b79bd","title":"Laboratory Technician ","department":"Process Development","team":"Process Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-10-07T22:57:51.748+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/e50c73d9-f49c-482d-8810-31b67d9b79bd","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/e50c73d9-f49c-482d-8810-31b67d9b79bd/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
The Laboratory Technician runs high-temperature processing equipment in Mariana Minerals' Deep Sea Nodule Lab, where we turn polymetallic nodules from the Clarion-Clipperton Zone (CCZ) into battery-grade nickel, copper and cobalt. This hands-on role prepares feed, operates a rotary kiln, electric arc furnace and induction converter, samples products, and keeps the lab safe and orderly. The role reports to the Process/Metallurgical Engineering lead and works under engineer supervision at first, with a path to independent operation.
What You'll Do
Crush, screen, dry, split and weigh nodule and calcine samples; run nodule wash trials
Operate the rotary kiln and its off-gas train: condenser, gas analyzers and NaOH impingers
Prepare charges, monitor and tap electric arc furnace heats; run box furnace screening melts
Run induction converter heats, including crucible pre-heat, pyrite charging, oxygen blows and timed sampling
Monitor temperatures, arc power, gas flows and cooling water; respond to alarms and interlocks
Verify exhaust fans and scrubbers before hot work; change gas cylinders and maintain scrubber liquor
Record run data in batch sheets and spreadsheets: charge weights, temperatures, gas flows, product masses and sample IDs
Track samples through shipment to external labs with chain-of-custody records
Keep inventory of crucibles, refractories, reagents and gases
Perform routine maintenance and minor repairs; support commissioning of new equipment
Follow SOPs, lockout/tagout, hot-work and gas-handling procedures, and wear PPE for molten-metal work
Inspect safety equipment on schedule and report near-misses and equipment issues promptly
Desired Qualifications
Associate degree or technical diploma in chemistry, materials, metallurgy or a related field, or equivalent hands-on experience
2+ years' experience in a lab, foundry, smelter, refinery or similar high-temperature setting
Comfort operating furnaces, gas cylinders and pressurized or water-cooled equipment
Experience with molten metal handling, tapping or crucible melting is a plus
Familiarity with induction, arc or tube furnaces, off-gas sampling or wet scrubbers is a plus
Sample preparation for XRF or ICP analysis is a plus
Careful record-keeping and working knowledge of Excel
Strong safety habits and willingness to stop work when conditions are unsafe
Able to lift up to 50 lb (23 kg), stand for long periods, and work near radiant heat, molten material and process gases
Medically cleared and fit-tested for respirator use
On-site role with standard weekday hours and occasional extended shifts to finish a furnace heat or cool-down
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nThe Laboratory Technician runs high-temperature processing equipment in Mariana Minerals' Deep Sea Nodule Lab, where we turn polymetallic nodules from the Clarion-Clipperton Zone (CCZ) into battery-grade nickel, copper and cobalt. This hands-on role prepares feed, operates a rotary kiln, electric arc furnace and induction converter, samples products, and keeps the lab safe and orderly. The role reports to the Process/Metallurgical Engineering lead and works under engineer supervision at first, with a path to independent operation.\n\nWhat You'll Do\n\n - Crush, screen, dry, split and weigh nodule and calcine samples; run nodule wash trials\n\n - Operate the rotary kiln and its off-gas train: condenser, gas analyzers and NaOH impingers\n\n - Prepare charges, monitor and tap electric arc furnace heats; run box furnace screening melts\n\n - Run induction converter heats, including crucible pre-heat, pyrite charging, oxygen blows and timed sampling\n\n - Monitor temperatures, arc power, gas flows and cooling water; respond to alarms and interlocks\n\n - Verify exhaust fans and scrubbers before hot work; change gas cylinders and maintain scrubber liquor\n\n - Record run data in batch sheets and spreadsheets: charge weights, temperatures, gas flows, product masses and sample IDs\n\n - Track samples through shipment to external labs with chain-of-custody records\n\n - Keep inventory of crucibles, refractories, reagents and gases\n\n - Perform routine maintenance and minor repairs; support commissioning of new equipment\n\n - Follow SOPs, lockout/tagout, hot-work and gas-handling procedures, and wear PPE for molten-metal work\n\n - Inspect safety equipment on schedule and report near-misses and equipment issues promptly\n\nDesired Qualifications\n\n - Associate degree or technical diploma in chemistry, materials, metallurgy or a related field, or equivalent hands-on experience\n\n - 2+ years' experience in a lab, foundry, smelter, refinery or similar high-temperature setting\n\n - Comfort operating furnaces, gas cylinders and pressurized or water-cooled equipment\n\n - Experience with molten metal handling, tapping or crucible melting is a plus\n\n - Familiarity with induction, arc or tube furnaces, off-gas sampling or wet scrubbers is a plus\n\n - Sample preparation for XRF or ICP analysis is a plus\n\n - Careful record-keeping and working knowledge of Excel\n\n - Strong safety habits and willingness to stop work when conditions are unsafe\n\n - Able to lift up to 50 lb (23 kg), stand for long periods, and work near radiant heat, molten material and process gases\n\n - Medically cleared and fit-tested for respirator use\n\n - On-site role with standard weekday hours and occasional extended shifts to finish a furnace heat or cool-down\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$40 – $45 per hour • Offers Equity","scrapeableCompensationSalarySummary":null,"compensationTiers":[{"id":"1a3bc015-c5b3-457a-88f8-c84462575ba2","tierSummary":"$40 – $45 per hour • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"74320d59-9151-4e80-8aac-3a301e09b2fa","summary":"$40 – $45 per hour","compensationType":"Salary","interval":"1 HOUR","currencyCode":"USD","minValue":40,"maxValue":45},{"id":"c70592db-3323-489f-aa87-4c307921066c","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 HOUR","currencyCode":"USD","minValue":40,"maxValue":45},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"3102c1e5-86be-4b4d-afe3-e82149f7e22a","title":"Structural Designer","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-07-10T20:36:45.384+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/3102c1e5-86be-4b4d-afe3-e82149f7e22a","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/3102c1e5-86be-4b4d-afe3-e82149f7e22a/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring a Structural Steel Designer to configure and lead structural steel drafting and modeling for our capital projects, from conceptual engineering through detailed design.
In this role, you will lead the configuration of projects in Tekla (or similar software packages), establishing the databases, libraries, templates, and workflows that standardize how Mariana models and drafts structural steel. You will develop 3D models and produce the general arrangement, fabrication, and erection drawings that take designs from concept to construction-ready. You will define how third-party models, vendor drawings, and EPC deliverables integrate into Mariana’s hosted Tekla environment, ensuring quality and consistency across partners. This is a hands-on design role with the opportunity to shape best practices and tooling as Mariana scales its project delivery.
Configure new projects in Tekla, including profile and section libraries, connection templates, and drawing styles
Develop and draft structural steel 3D models—framing plans, platforms, stairs, ladders, handrails, and supports
Generate general arrangement (GA), fabrication/shop, and erection drawings
Develop and draft connection details, bolt and weld specifications, and anchor bolt and embed plans
Produce material take-offs, bills of material, and bolt lists
Develop best practices, standards, and workflows for structural steel drafting and modeling
Define requirements for third party structural steel models, vendor drawings, and connection designs to integrate into Mariana’s hosted Tekla environment
Define requirements for third party EPC companies to complete detailed engineering
Coordinate with process, piping, electrical, and civil/structural disciplines to ensure clash-free, constructible designs
5+ years of experience with Teka (or Advance Steel / SDS2)
CAD administration experience configuring projects, libraries, and templates
Strong 2D drafting experience—GA drawings, shop/fabrication drawings, erection drawings, and connection details
Strong 3D modeling experience—structural steel framing, platforms, stairs and handrails, and connection modeling
Working knowledge of structural steel detailing standards and codes (AISC, AWS)
Experience in industrial, mining, minerals processing, chemical, or heavy-industrial environments preferred
Ability to develop standards and workflows and work independently in a fast-moving, first-principles-driven environment
Experience coordinating with multidisciplinary engineering teams and external EPC partners
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nWe are hiring a Structural Steel Designer to configure and lead structural steel drafting and modeling for our capital projects, from conceptual engineering through detailed design.\n\nIn this role, you will lead the configuration of projects in Tekla (or similar software packages), establishing the databases, libraries, templates, and workflows that standardize how Mariana models and drafts structural steel. You will develop 3D models and produce the general arrangement, fabrication, and erection drawings that take designs from concept to construction-ready. You will define how third-party models, vendor drawings, and EPC deliverables integrate into Mariana’s hosted Tekla environment, ensuring quality and consistency across partners. This is a hands-on design role with the opportunity to shape best practices and tooling as Mariana scales its project delivery.\n\n \n\n\nWHAT YOU’LL DO\n\n - Configure new projects in Tekla, including profile and section libraries, connection templates, and drawing styles\n\n - Develop and draft structural steel 3D models—framing plans, platforms, stairs, ladders, handrails, and supports\n\n - Generate general arrangement (GA), fabrication/shop, and erection drawings\n\n - Develop and draft connection details, bolt and weld specifications, and anchor bolt and embed plans\n\n - Produce material take-offs, bills of material, and bolt lists\n\n - Develop best practices, standards, and workflows for structural steel drafting and modeling\n\n - Define requirements for third party structural steel models, vendor drawings, and connection designs to integrate into Mariana’s hosted Tekla environment\n\n - Define requirements for third party EPC companies to complete detailed engineering\n\n - Coordinate with process, piping, electrical, and civil/structural disciplines to ensure clash-free, constructible designs\n\n \n\n\nWHAT YOU’LL BRING\n\n - 5+ years of experience with Teka (or Advance Steel / SDS2)\n\n - CAD administration experience configuring projects, libraries, and templates\n\n - Strong 2D drafting experience—GA drawings, shop/fabrication drawings, erection drawings, and connection details\n\n - Strong 3D modeling experience—structural steel framing, platforms, stairs and handrails, and connection modeling\n\n - Working knowledge of structural steel detailing standards and codes (AISC, AWS)\n\n - Experience in industrial, mining, minerals processing, chemical, or heavy-industrial environments preferred\n\n - Ability to develop standards and workflows and work independently in a fast-moving, first-principles-driven environment\n\n - Experience coordinating with multidisciplinary engineering teams and external EPC partners\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"1df6ed05-0097-484a-ab3b-e88eebf262de","title":"Recycling Operator","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-07-13T14:32:15.974+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/1df6ed05-0097-484a-ab3b-e88eebf262de","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/1df6ed05-0097-484a-ab3b-e88eebf262de/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Summary
The Recycling Plant Operator is responsible for the safe, efficient, and high-quality processing of copper. This plant serves as the seed for all future recycling technology and operations globally. In this hands-on role, you will operate heavy material-processing equipment, ensure strict quality standards for incoming scrap, and execute production workflows. You will serve as the frontline operator bridging the gap between raw material intake and advanced hydrometallurgical processing.
Housing can be provided onsite.
Key Responsibilities
Safety & Compliance: Strictly adhere to all environmental, health, and safety protocols (PPE, Lockout/Tagout, Job Safety Analysis). Immediately report hazards or near-misses.
Data & Reporting: Accurately record production data, material metrics, and tool health using digital dashboards and software tools.
Equipment Operation: Safely operate copper shredding, sorting, baling, and hydrometallurgical processing equipment (including conveyors, pumps, and filters).
Material Processing: Inspect, sort, and grade incoming copper scrap according to established chemical and physical specifications; remove contaminants.
Maintenance & Troubleshooting: Perform routine preventative maintenance, cleaning, replacement of wear parts, and basic mechanical troubleshooting on plant machinery to resolve downtime.
Process Improvement: Collaborate with the engineering team to identify continuous improvement opportunities related to throughput, yield, and safety.
Numerical Control (NC): Operate and program numerical control (CNC) equipment to support localized machining, tooling adjustments, and part fabrication for the recycling process.
Required Qualifications
High School Diploma or equivalent (bachelor’s degree in manufacturing or mechanical fields is a plus).
Demonstrated hands-on experience in industrial, manufacturing, or heavy assembly environments.
Ability to read, understand, and strictly follow Standard Operating Procedures (SOPs) and safety guidelines.
Mechanical aptitude with the ability to identify machine faults using sight and sound.
Physical Demands
Ability to perform physically demanding work, including routinely and safely lifting up to 50 lbs.
Ability to stand, walk, and navigate uneven terrain for up to 12-hour shifts.
Ability to frequently bend, stoop, crouch, and reach.
Must wear required Personal Protective Equipment (PPE) including hard hats, safety glasses, steel-toed boots, and respirators (PAPR) as required by the area.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Summary \nThe Recycling Plant Operator is responsible for the safe, efficient, and high-quality processing of copper. This plant serves as the seed for all future recycling technology and operations globally. In this hands-on role, you will operate heavy material-processing equipment, ensure strict quality standards for incoming scrap, and execute production workflows. You will serve as the frontline operator bridging the gap between raw material intake and advanced hydrometallurgical processing.\n\nHousing can be provided onsite. \n\n\n\nKey Responsibilities\n\n - Safety & Compliance: Strictly adhere to all environmental, health, and safety protocols (PPE, Lockout/Tagout, Job Safety Analysis). Immediately report hazards or near-misses.\n\n - Data & Reporting: Accurately record production data, material metrics, and tool health using digital dashboards and software tools.\n\n - Equipment Operation: Safely operate copper shredding, sorting, baling, and hydrometallurgical processing equipment (including conveyors, pumps, and filters).\n\n - Material Processing: Inspect, sort, and grade incoming copper scrap according to established chemical and physical specifications; remove contaminants.\n\n - Maintenance & Troubleshooting: Perform routine preventative maintenance, cleaning, replacement of wear parts, and basic mechanical troubleshooting on plant machinery to resolve downtime.\n\n - Process Improvement: Collaborate with the engineering team to identify continuous improvement opportunities related to throughput, yield, and safety.\n\n - Numerical Control (NC): Operate and program numerical control (CNC) equipment to support localized machining, tooling adjustments, and part fabrication for the recycling process.\n\nRequired Qualifications\n\n - High School Diploma or equivalent (bachelor’s degree in manufacturing or mechanical fields is a plus).\n\n - Demonstrated hands-on experience in industrial, manufacturing, or heavy assembly environments.\n\n - Ability to read, understand, and strictly follow Standard Operating Procedures (SOPs) and safety guidelines.\n\n - Mechanical aptitude with the ability to identify machine faults using sight and sound.\n\nPhysical Demands\n\n - Ability to perform physically demanding work, including routinely and safely lifting up to 50 lbs.\n\n - Ability to stand, walk, and navigate uneven terrain for up to 12-hour shifts.\n\n - Ability to frequently bend, stoop, crouch, and reach.\n\n - Must wear required Personal Protective Equipment (PPE) including hard hats, safety glasses, steel-toed boots, and respirators (PAPR) as required by the area.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"2dac8379-171d-4c31-a960-ecb43a5af7a7","title":"Drone Operator","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-08-13T13:01:40.077+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/2dac8379-171d-4c31-a960-ecb43a5af7a7","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/2dac8379-171d-4c31-a960-ecb43a5af7a7/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Position Summary
The Drone Operator is responsible for the safe, efficient, and compliant operation of unmanned aerial systems (UAS) in support of mining operations. This role conducts and supervises continuous drone flight activities for surveying, inspection, monitoring, mapping, stockpile measurements, environmental compliance, security surveillance, and operational support. The Drone Operator ensures all drone missions are executed in accordance with applicable aviation regulations, company policies, and mine safety standards.
This position requires strong technical knowledge of drone systems, mining operations, aviation regulations, and emergency response procedures. Operators must maintain required certifications and be capable of working independently in a safety-sensitive environment.
Housing can be provided onsite.
Essential Duties and Responsibilities
Drone Operations
Conduct pre-flight, in-flight, and post-flight inspections of drone systems and equipment.
Operate and monitor drones in a 24/7 mining environment during day and night shifts.
Execute automated and manual flight missions for mapping, surveying, inspections, and site monitoring.
Monitor telemetry, battery status, weather conditions, and airspace restrictions to ensure safe operations.
Maintain compliance with FAA, MSHA, and company safety and operational requirements.
Collect aerial imagery, video, LiDAR, photogrammetry, and other operational data.
Verify data quality, process mission outputs, and distribute information to stakeholders.
Prepare reports and communicate operational findings to management and project teams.
Coordinate drone activities with mine supervisors, engineering, dispatch, security, and safety personnel.
Conduct mission risk assessments and maintain awareness of mining hazards, traffic, blasting schedules, and restricted areas.
Respond to equipment malfunctions, flight deviations, and emergency situations.
Perform routine maintenance and troubleshooting on drones, sensors, batteries, and related equipment.
Coordinate repairs with vendors and technical support teams and maintain parts and supply inventories.
Maintain accurate flight logs, operational records, maintenance documentation, and compliance reports.
Required Qualifications
Valid driver's license with acceptable driving record.
High school diploma or GED required.
Desired Qualifications
FAA Part 107 Remote Pilot Certificate
Ability to obtain and maintain site-specific mining and safety certifications.
Associate degree or technical training in aviation, geospatial technology, engineering, surveying, or a related field preferred.
Minimum 2 years of professional drone operating experience preferred.
Experience operating drones in industrial, construction, mining, energy, or similar environments preferred.
Understanding of mining operations, mine safety procedures, and site hazards.
Experience with drone mission planning software and flight management systems.
Knowledge of aerial surveying, photogrammetry, GIS, LiDAR, or mapping technologies preferred.
Ability to read maps, site plans, and technical documents.
Familiarity with weather impacts on drone operations.
Required Skills & Competencies
Strong commitment to safety.
Excellent situational awareness and decision-making skills.
Ability to work independently with minimal supervision.
Strong verbal and written communication skills.
Ability to prioritize multiple tasks in a fast-paced environment.
Strong problem-solving and troubleshooting abilities.
Attention to detail and accurate recordkeeping.
Ability to remain alert and focused during extended monitoring periods.
Physical Requirements
Ability to work outdoors in varying weather conditions.
Ability to walk on uneven terrain and active mining sites.
Ability to lift and carry equipment weighing up to 50 pounds.
Ability to stand, walk, climb, bend, and kneel for extended periods.
Ability to maintain visual observation of aircraft during flight operations when required.
Work Environment
Active surface or underground mining operations.
Exposure to dust, noise, vibration, heavy equipment traffic, and changing weather conditions.
Rotating 24/7 shift coverage including nights, weekends, and holidays.
Safety-sensitive position subject to drug and alcohol testing.
Preferred Qualifications
Experience with autonomous drone operations.
MSHA training or mining industry experience.
GIS, surveying, photogrammetry, or LiDAR experience.
Experience managing multiple simultaneous drone missions.
Advanced drone certifications or manufacturer-specific training.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nPosition Summary\n\nThe Drone Operator is responsible for the safe, efficient, and compliant operation of unmanned aerial systems (UAS) in support of mining operations. This role conducts and supervises continuous drone flight activities for surveying, inspection, monitoring, mapping, stockpile measurements, environmental compliance, security surveillance, and operational support. The Drone Operator ensures all drone missions are executed in accordance with applicable aviation regulations, company policies, and mine safety standards.\n\nThis position requires strong technical knowledge of drone systems, mining operations, aviation regulations, and emergency response procedures. Operators must maintain required certifications and be capable of working independently in a safety-sensitive environment.\n\nHousing can be provided onsite. \n\n\n\nEssential Duties and Responsibilities\n\nDrone Operations\n\n - Conduct pre-flight, in-flight, and post-flight inspections of drone systems and equipment.\n\n - Operate and monitor drones in a 24/7 mining environment during day and night shifts.\n\n - Execute automated and manual flight missions for mapping, surveying, inspections, and site monitoring.\n\n - Monitor telemetry, battery status, weather conditions, and airspace restrictions to ensure safe operations.\n\n - Maintain compliance with FAA, MSHA, and company safety and operational requirements.\n\n - Collect aerial imagery, video, LiDAR, photogrammetry, and other operational data.\n\n - Verify data quality, process mission outputs, and distribute information to stakeholders.\n\n - Prepare reports and communicate operational findings to management and project teams.\n\n - Coordinate drone activities with mine supervisors, engineering, dispatch, security, and safety personnel.\n\n - Conduct mission risk assessments and maintain awareness of mining hazards, traffic, blasting schedules, and restricted areas.\n\n - Respond to equipment malfunctions, flight deviations, and emergency situations.\n\n - Perform routine maintenance and troubleshooting on drones, sensors, batteries, and related equipment.\n\n - Coordinate repairs with vendors and technical support teams and maintain parts and supply inventories.\n\n - Maintain accurate flight logs, operational records, maintenance documentation, and compliance reports.\n\n\n\nRequired Qualifications\n\n - Valid driver's license with acceptable driving record.\n\n - High school diploma or GED required.\n \n \n\nDesired Qualifications\n\n - FAA Part 107 Remote Pilot Certificate\n\n - Ability to obtain and maintain site-specific mining and safety certifications.\n\n - Associate degree or technical training in aviation, geospatial technology, engineering, surveying, or a related field preferred.\n\n - Minimum 2 years of professional drone operating experience preferred.\n\n - Experience operating drones in industrial, construction, mining, energy, or similar environments preferred.\n\n - Understanding of mining operations, mine safety procedures, and site hazards.\n\n - Experience with drone mission planning software and flight management systems.\n\n - Knowledge of aerial surveying, photogrammetry, GIS, LiDAR, or mapping technologies preferred.\n\n - Ability to read maps, site plans, and technical documents.\n\n - Familiarity with weather impacts on drone operations.\n\n\n\nRequired Skills & Competencies\n\n - Strong commitment to safety.\n\n - Excellent situational awareness and decision-making skills.\n\n - Ability to work independently with minimal supervision.\n\n - Strong verbal and written communication skills.\n\n - Ability to prioritize multiple tasks in a fast-paced environment.\n\n - Strong problem-solving and troubleshooting abilities.\n\n - Attention to detail and accurate recordkeeping.\n\n - Ability to remain alert and focused during extended monitoring periods.\n\n\n\nPhysical Requirements\n\n - Ability to work outdoors in varying weather conditions.\n\n - Ability to walk on uneven terrain and active mining sites.\n\n - Ability to lift and carry equipment weighing up to 50 pounds.\n\n - Ability to stand, walk, climb, bend, and kneel for extended periods.\n\n - Ability to maintain visual observation of aircraft during flight operations when required.\n\n\n\nWork Environment\n\n - Active surface or underground mining operations.\n\n - Exposure to dust, noise, vibration, heavy equipment traffic, and changing weather conditions.\n\n - Rotating 24/7 shift coverage including nights, weekends, and holidays.\n\n - Safety-sensitive position subject to drug and alcohol testing.\n\n\n\nPreferred Qualifications\n\n - Experience with autonomous drone operations.\n\n - MSHA training or mining industry experience.\n\n - GIS, surveying, photogrammetry, or LiDAR experience.\n\n - Experience managing multiple simultaneous drone missions.\n\n - Advanced drone certifications or manufacturer-specific training.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"f16790d9-f6c6-4154-aa36-b9bbb2c63938","title":"Director of Mining and Technical Services","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-07-30T18:28:26.336+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/f16790d9-f6c6-4154-aa36-b9bbb2c63938","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/f16790d9-f6c6-4154-aa36-b9bbb2c63938/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
This position is based out of Moab, UT and the candidate should be local or willing to relocate.
This role provides strategic and technical leadership to define, plan, and control the mining, hauling, and delivery of copper ore to the leach pad, safely, efficiently, and within budget. Direct all resource modeling, pit optimization, mine design, grade control, survey, geotechnical, and planning functions across the Copper One operation and mine expansions development to ensure optimal mine performance and long-term value creation.
Provide daily technical oversight and short-term plan control over drilling, blasting, loading, and hauling activities, including the site's autonomous haul truck fleet and its planned expansion to loading and support equipment. Ensure the short-term plan remains firmly connected to the mid- and long-term strategic mine plan through disciplined KPI monitoring, daily survey control, and drone-based site verification.
Partner closely with Technical Program managers (TPMs) on a daily basis to drive projects schedules and technical improvement initiatives.
This role carries direct accountability for Technical Services and Mine Operations performance — production, grade, cost, and safety outcomes — and is expected to work in close, daily partnership with the Mine General Foreman and operations team to translate the strategic and budget plan into achievable daily, weekly, and monthly execution.
Lead resource modeling, reserve estimation, and mine reconciliation processes.
Develop and manage annual budgets, short-term forecasts, five-year plans, and life-of-mine schedules.
Direct mine planning, pit optimization, and technical studies supporting operational and strategic decision-making.
Oversee grade control, survey, geotechnical, drilling, and blasting activities to optimize productivity and ore recovery.
Monitor technical and operational performance against production, grade, cost, and safety targets.
Identify and implement opportunities to improve productivity, reduce costs, and enhance operational efficiency.
Ensure compliance with regulatory, environmental, and safety requirements, including MSHA standards.
Partner closely with operations and maintenance teams to align mine execution with approved plans.
Build, mentor, and lead a high-performing technical services team.
Bachelor's degree in Mining Engineering, Geological Engineering, Geology, or a related discipline.
Minimum of 12-15 years of progressive experience in open-pit mining operations, mine planning, technical services, or mine engineering.
Extensive experience in a leadership or management role overseeing multidisciplinary technical teams.
Strong experience with resource modeling, reserve estimation, mine planning, grade control, and production reconciliation.
Demonstrated knowledge of reporting standards and mineral reserve/resource estimation practices.
Experience leading pit optimization studies, feasibility studies, and life-of-mine planning processes.
Strong understanding of geotechnical, hydrogeological, and operational factors affecting open-pit mine design and performance.
Experience managing drilling and blasting programs and supporting operational execution.
Strong financial acumen with experience developing budgets, cost forecasts, and economic evaluations.
Knowledge of MSHA regulations and environmental compliance requirements.
Excellent leadership, communication, project management, and stakeholder engagement skills.
Experience supporting autonomous haulage systems and mining technology initiatives.
Experience at both operating mine sites and project development stages, including feasibility and expansion projects.
Demonstrated success leading cross-functional teams and driving operational performance improvements.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nPOSITION SUMMARY \n\nThis position is based out of Moab, UT and the candidate should be local or willing to relocate. \n\nThis role provides strategic and technical leadership to define, plan, and control the mining, hauling, and delivery of copper ore to the leach pad, safely, efficiently, and within budget. Direct all resource modeling, pit optimization, mine design, grade control, survey, geotechnical, and planning functions across the Copper One operation and mine expansions development to ensure optimal mine performance and long-term value creation.\n\nProvide daily technical oversight and short-term plan control over drilling, blasting, loading, and hauling activities, including the site's autonomous haul truck fleet and its planned expansion to loading and support equipment. Ensure the short-term plan remains firmly connected to the mid- and long-term strategic mine plan through disciplined KPI monitoring, daily survey control, and drone-based site verification.\n\nPartner closely with Technical Program managers (TPMs) on a daily basis to drive projects schedules and technical improvement initiatives.\n\nThis role carries direct accountability for Technical Services and Mine Operations performance — production, grade, cost, and safety outcomes — and is expected to work in close, daily partnership with the Mine General Foreman and operations team to translate the strategic and budget plan into achievable daily, weekly, and monthly execution.\n\n\n\n\nKEY RESPONSIBILITIES\n\n - Lead resource modeling, reserve estimation, and mine reconciliation processes.\n\n - Develop and manage annual budgets, short-term forecasts, five-year plans, and life-of-mine schedules.\n\n - Direct mine planning, pit optimization, and technical studies supporting operational and strategic decision-making.\n\n - Oversee grade control, survey, geotechnical, drilling, and blasting activities to optimize productivity and ore recovery.\n\n - Monitor technical and operational performance against production, grade, cost, and safety targets.\n\n - Identify and implement opportunities to improve productivity, reduce costs, and enhance operational efficiency.\n\n - Ensure compliance with regulatory, environmental, and safety requirements, including MSHA standards.\n\n - Partner closely with operations and maintenance teams to align mine execution with approved plans.\n\n - Build, mentor, and lead a high-performing technical services team.\n\n\n\n\nREQUIRED QUALIFICATIONS & EXPERIENCE\n\n - Bachelor's degree in Mining Engineering, Geological Engineering, Geology, or a related discipline.\n\n - Minimum of 12-15 years of progressive experience in open-pit mining operations, mine planning, technical services, or mine engineering.\n\n - Extensive experience in a leadership or management role overseeing multidisciplinary technical teams.\n\n - Strong experience with resource modeling, reserve estimation, mine planning, grade control, and production reconciliation.\n\n - Demonstrated knowledge of reporting standards and mineral reserve/resource estimation practices.\n\n - Experience leading pit optimization studies, feasibility studies, and life-of-mine planning processes.\n\n - Strong understanding of geotechnical, hydrogeological, and operational factors affecting open-pit mine design and performance.\n\n - Experience managing drilling and blasting programs and supporting operational execution.\n\n - Strong financial acumen with experience developing budgets, cost forecasts, and economic evaluations.\n\n - Knowledge of MSHA regulations and environmental compliance requirements.\n\n - Excellent leadership, communication, project management, and stakeholder engagement skills.\n\n\nPREFERRED QUALIFICATIONS\n\n - Experience supporting autonomous haulage systems and mining technology initiatives.\n\n - Experience at both operating mine sites and project development stages, including feasibility and expansion projects.\n\n - Demonstrated success leading cross-functional teams and driving operational performance improvements.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"a538a091-92fc-4807-9575-8d940a2e443b","title":"Sr. Recruiter ","department":"General","team":"People Operations","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-10-07T23:09:08.432+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/a538a091-92fc-4807-9575-8d940a2e443b","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/a538a091-92fc-4807-9575-8d940a2e443b/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring a Sr. Recruiter to build the teams behind the teams at Mariana Minerals. You'll own full-cycle recruiting across corporate functions, helping us scale a software-first critical minerals company from the ground up.
You'll partner directly with functional leaders to understand what great looks like, find people who have done this at fast-growing companies, and give every candidate an experience that reflects who we are. This is a great fit for someone who loves the full recruiting cycle, builds trust quickly with leaders, and wants to help shape how a company hires.
Own full-cycle recruiting for G&A and corporate roles, from intake through offer close
Partner with hiring managers and executives to define role requirements, hiring plans, and interview processes
Build creative sourcing strategies for both active and passive candidates across finance, legal, HR, operations, procurement, and other functions
Run personalized, thoughtful outreach that reflects our mission and stage
Manage multiple searches at once while keeping a high quality bar
Coach interviewers and hiring managers on structured interviewing, calibration, and debriefs
Lead compensation conversations, close candidates, and manage competing offers
Keep Ashby clean and current, and track pipeline health, time to fill, and other key metrics
Share market insights on compensation, talent availability, and competitor activity
Help build and improve recruiting processes, templates, and playbooks as we scale
Represent Mariana Minerals with a warm, engaging, and transparent candidate experience
Build diverse, high-quality pipelines across experience levels
Opportunity to help build our early-career and university recruiting efforts, including internships and new grad hiring, as we grow
5-8+ years of full-cycle recruiting experience, with meaningful G&A or corporate recruiting in a high-growth startup or technology company
Experience recruiting across a range of functions (finance, legal, people, operations, sales, marketing)
Proven ability to partner with senior leaders and executives
Strong sourcing skills, including LinkedIn Recruiter, Boolean search, and passive candidate outreachExperience building recruiting processes or playbooks from scratch
Experience hiring for early-stage finance, legal, or people teams
Familiarity with seed-to-Series B recruiting environments
Expert in ATS tools (preference for Ashby)
Strong written communication and personalized outreach skills
Strong closing and negotiation skills
Data-driven approach to pipeline management
High ownership mindset and comfort with ambiguity
Passion for building exceptional teams and creating outstanding candidate experiences
Experience with campus or early-career recruiting
Experience in industrial, hardware, energy, mining, or deep tech companies
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe are hiring a Sr. Recruiter to build the teams behind the teams at Mariana Minerals. You'll own full-cycle recruiting across corporate functions, helping us scale a software-first critical minerals company from the ground up.\n\nYou'll partner directly with functional leaders to understand what great looks like, find people who have done this at fast-growing companies, and give every candidate an experience that reflects who we are. This is a great fit for someone who loves the full recruiting cycle, builds trust quickly with leaders, and wants to help shape how a company hires.\n\n\nWHAT YOU'LL DO\n\n - Own full-cycle recruiting for G&A and corporate roles, from intake through offer close\n\n - Partner with hiring managers and executives to define role requirements, hiring plans, and interview processes\n\n - Build creative sourcing strategies for both active and passive candidates across finance, legal, HR, operations, procurement, and other functions\n\n - Run personalized, thoughtful outreach that reflects our mission and stage\n\n - Manage multiple searches at once while keeping a high quality bar\n\n - Coach interviewers and hiring managers on structured interviewing, calibration, and debriefs\n\n - Lead compensation conversations, close candidates, and manage competing offers\n\n - Keep Ashby clean and current, and track pipeline health, time to fill, and other key metrics\n\n - Share market insights on compensation, talent availability, and competitor activity\n\n - Help build and improve recruiting processes, templates, and playbooks as we scale\n\n - Represent Mariana Minerals with a warm, engaging, and transparent candidate experience\n\n - Build diverse, high-quality pipelines across experience levels\n\n - Opportunity to help build our early-career and university recruiting efforts, including internships and new grad hiring, as we grow\n\n\nDESIRED QUALIFICATIONS\n\n - 5-8+ years of full-cycle recruiting experience, with meaningful G&A or corporate recruiting in a high-growth startup or technology company\n\n - Experience recruiting across a range of functions (finance, legal, people, operations, sales, marketing)\n\n - Proven ability to partner with senior leaders and executives\n\n - Strong sourcing skills, including LinkedIn Recruiter, Boolean search, and passive candidate outreachExperience building recruiting processes or playbooks from scratch\n\n - Experience hiring for early-stage finance, legal, or people teams\n\n - Familiarity with seed-to-Series B recruiting environments\n\n - Expert in ATS tools (preference for Ashby)\n\n - Strong written communication and personalized outreach skills\n\n - Strong closing and negotiation skills\n\n - Data-driven approach to pipeline management\n\n - High ownership mindset and comfort with ambiguity\n\n - Passion for building exceptional teams and creating outstanding candidate experiences\n\n\nNICE TO HAVE\n\n - Experience with campus or early-career recruiting\n\n - Experience in industrial, hardware, energy, mining, or deep tech companies\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$100K – $175K • Offers Equity","scrapeableCompensationSalarySummary":"$100K - $175K","compensationTiers":[{"id":"8e2f3433-fa04-47c8-97ac-4269f56b90a2","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $100K – $175K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"5fcf7a82-f792-447f-b7f6-91a4362fe70a","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"id":"598ddfb0-507e-48a7-b69b-9c96fb58b4d3","summary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $100K – $175K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":175000}]}],"summaryComponents":[{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":175000}]}},{"id":"9e8fef14-ebf8-4298-906a-e08f6ae04cb4","title":"Staff Product Designer, MarianaOS","department":"Product Development","team":"Product Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-08-11T19:10:58.137+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/9e8fef14-ebf8-4298-906a-e08f6ae04cb4","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/9e8fef14-ebf8-4298-906a-e08f6ae04cb4/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We already have strong team of engineers, product managers and end users; what we don't have is someone whose full-time job is to sit with complexity and simplify it. We're hiring our first dedicated design hire to help bring MarianaOS to the next level. You'll work across teams to ensure that MarianaOS is intuitive, and human-centered on the surface while managing a tremendous amount of complexity underneath. This is not primarily a pixel-polish role; it's a role for someone who can take genuinely complicated, data-heavy workflows and make them feel obvious.
Take complex, data-dense workflows in MarianaOS and design clear, usable information architecture and flows ensuring MarianaOS is easy and fast to use for the 100s of employees here that rely on MarianaOS daily to do their complex jobs.
Grow and own our design system, including coded components and not just Figma files, which allows our engineers to quickly build great user interfaces with agentic tools.
Partner with PMs and engineers from early problem framing through shipped UI; you'll be in the room for the messy part, not just handed a spec.
Give and receive fast, direct design feedback across the team to help raise the visual bar and deliver valuable and usable products for end users.
Prototype directly in code when that's the fastest way to a real answer; pairing and working live with engineers rather than only handing off finished mocks so that great designs are delivered quickly.
Set short-horizon design direction (weeks to a couple months, not multi-year vision decks) so a fast-shipping engineering team stays pointed at something coherent.
Run and synthesize lightweight user research and feedback loops with customers and internal stakeholders, ensuring the products we are launching are grounded in user needs and feedback
Define best design practices/ways of working setting the tone of how design will function in the company as we grow.
We're optimizing for five things, roughly in this priority order:
Simplifying complexity. The single most important skill. Show us you can take a complicated product or dataset and turn it into something clear. That matters more than visual polish or raw technical depth.
Complex product experience. You've designed for a real, non-trivial product and can walk us through the hard tradeoffs you made. Experience designing for technical, operational, or data-heavy products (vs. consumer apps) is important. Showing the ability to distill complex problems into a clear story of what the user is doing and why and how they get to the end goal.
Opinionated visual design direction. Brings a real perspective on what great visual design looks like; we don’t want middle of the road SaaS visual design. We want future looking visual design which reflects our vision to modernize mining. We need to do this in a way which doesn’t compromise usability in a way which impacts outcomes.
Collaborative, cross-functional instinct. You're energized by sitting with PMs and engineers to work through a problem together, not just receiving a brief. We need someone whose design judgment the team learns to trust quickly.
AI fluency and adaptability. The classic mock-first design process (discovery, mocks, iterate) doesn't fit how software gets built anymore, especially at a company where engineers, and increasingly customers and internal users via tools like Replit and other AI builders, can go from idea to working software in hours. We want someone who already uses AI tools (Claude Code, Cursor, v0, or similar) as part of how they work, prototypes in code rather than only in Figma, and adapts their process readily rather than defending a fixed one. This person should be comfortable designing in the open: shaping something as it's being built and used, rather than fully specifying it up front.
Given how much AI has scrambled the shape of design/product/engineering roles in the last couple of years, we're open to unconventional backgrounds: a UX designer, a design-minded product builder, or an engineer who loves design and wants to focus on prototyping and systems. What matters is demonstrated judgment on complex problems, not the job title on a past resume.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nWe already have strong team of engineers, product managers and end users; what we don't have is someone whose full-time job is to sit with complexity and simplify it. We're hiring our first dedicated design hire to help bring MarianaOS to the next level. You'll work across teams to ensure that MarianaOS is intuitive, and human-centered on the surface while managing a tremendous amount of complexity underneath. This is not primarily a pixel-polish role; it's a role for someone who can take genuinely complicated, data-heavy workflows and make them feel obvious.\n\n\n\n\nWHAT YOU'LL DO\n\n - Take complex, data-dense workflows in MarianaOS and design clear, usable information architecture and flows ensuring MarianaOS is easy and fast to use for the 100s of employees here that rely on MarianaOS daily to do their complex jobs.\n\n - Grow and own our design system, including coded components and not just Figma files, which allows our engineers to quickly build great user interfaces with agentic tools.\n\n - Partner with PMs and engineers from early problem framing through shipped UI; you'll be in the room for the messy part, not just handed a spec.\n\n - Give and receive fast, direct design feedback across the team to help raise the visual bar and deliver valuable and usable products for end users.\n\n - Prototype directly in code when that's the fastest way to a real answer; pairing and working live with engineers rather than only handing off finished mocks so that great designs are delivered quickly.\n\n - Set short-horizon design direction (weeks to a couple months, not multi-year vision decks) so a fast-shipping engineering team stays pointed at something coherent.\n\n - Run and synthesize lightweight user research and feedback loops with customers and internal stakeholders, ensuring the products we are launching are grounded in user needs and feedback\n\n - Define best design practices/ways of working setting the tone of how design will function in the company as we grow.\n\n\n\n\nWHAT WE'RE LOOKING FOR\n\nWe're optimizing for five things, roughly in this priority order:\n\n - Simplifying complexity. The single most important skill. Show us you can take a complicated product or dataset and turn it into something clear. That matters more than visual polish or raw technical depth.\n\n - Complex product experience. You've designed for a real, non-trivial product and can walk us through the hard tradeoffs you made. Experience designing for technical, operational, or data-heavy products (vs. consumer apps) is important. Showing the ability to distill complex problems into a clear story of what the user is doing and why and how they get to the end goal.\n\n - Opinionated visual design direction. Brings a real perspective on what great visual design looks like; we don’t want middle of the road SaaS visual design. We want future looking visual design which reflects our vision to modernize mining. We need to do this in a way which doesn’t compromise usability in a way which impacts outcomes.\n\n - Collaborative, cross-functional instinct. You're energized by sitting with PMs and engineers to work through a problem together, not just receiving a brief. We need someone whose design judgment the team learns to trust quickly.\n\n - AI fluency and adaptability. The classic mock-first design process (discovery, mocks, iterate) doesn't fit how software gets built anymore, especially at a company where engineers, and increasingly customers and internal users via tools like Replit and other AI builders, can go from idea to working software in hours. We want someone who already uses AI tools (Claude Code, Cursor, v0, or similar) as part of how they work, prototypes in code rather than only in Figma, and adapts their process readily rather than defending a fixed one. This person should be comfortable designing in the open: shaping something as it's being built and used, rather than fully specifying it up front.\n \n \n\nGiven how much AI has scrambled the shape of design/product/engineering roles in the last couple of years, we're open to unconventional backgrounds: a UX designer, a design-minded product builder, or an engineer who loves design and wants to focus on prototyping and systems. What matters is demonstrated judgment on complex problems, not the job title on a past resume.\n\n\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$180K – $210K • Offers Equity","scrapeableCompensationSalarySummary":"$180K - $210K","compensationTiers":[{"id":"1d460696-781c-4f85-b5a1-fbfff66c246e","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $180K – $210K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"17e2d09b-b302-4b19-993a-5e2063d2a23d","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"id":"586affe1-3772-4004-8bdd-a8e1b768c839","summary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $180K – $210K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":210000}]}],"summaryComponents":[{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180000,"maxValue":210000}]}},{"id":"8e0b7b11-f1f1-43fa-adae-d51c5417f2ab","title":"Extractive Metallurgist","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-08-17T18:58:59.568+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/8e0b7b11-f1f1-43fa-adae-d51c5417f2ab","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/8e0b7b11-f1f1-43fa-adae-d51c5417f2ab/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are seeking an Extractive Metallurgist to join our growing technical team in Moab, UT. This role will play a critical part in the development, optimization, and scale-up of mineral processing systems for Mariana’s global operations. The ideal candidate brings strong process engineering and metallurgical expertise, ideally in zinc or copper, and thrives in fast-paced, startup environments where independence, creativity, and problem solving are essential.
You’ll work closely with operations, engineers, machine learning experts, and data scientists to develop innovative solutions that improve efficiency, recovery, and throughput across our projects.
Design, test, and optimize mineral processing flowsheets for new and existing projects.
Lead laboratory, pilot-scale, and plant trials for process validation and improvement.
Analyze metallurgical data to improve recovery, efficiency, and cost performance.
Collaborate with engineering teams on process design and scale-up.
Partner with data scientists and ML engineers to integrate advanced analytics and predictive models into process optimization.
Support commissioning and ramp-up of new facilities, with significant travel to sites.
Contribute to Mariana’s culture of continuous improvement, innovation, and safety.
Degree in Metallurgy, Chemical Engineering, or Process Engineering.
Hands-on mineral processing experience (zinc or copper preferred, broader base considered).
Proven ability to work independently in dynamic environments, with strong problem-solving skills.
Experience working in startup or entrepreneurial settings.
Background in industrial technology or product development.
Experience collaborating with machine learning engineers or data scientists.
Exposure to digitized process monitoring and automation systems.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe are seeking an Extractive Metallurgist to join our growing technical team in Moab, UT. This role will play a critical part in the development, optimization, and scale-up of mineral processing systems for Mariana’s global operations. The ideal candidate brings strong process engineering and metallurgical expertise, ideally in zinc or copper, and thrives in fast-paced, startup environments where independence, creativity, and problem solving are essential.\n\nYou’ll work closely with operations, engineers, machine learning experts, and data scientists to develop innovative solutions that improve efficiency, recovery, and throughput across our projects.\n\n\n\n\nWHAT YOU'LL DO\n\n - Design, test, and optimize mineral processing flowsheets for new and existing projects.\n\n - Lead laboratory, pilot-scale, and plant trials for process validation and improvement.\n\n - Analyze metallurgical data to improve recovery, efficiency, and cost performance.\n\n - Collaborate with engineering teams on process design and scale-up.\n\n - Partner with data scientists and ML engineers to integrate advanced analytics and predictive models into process optimization.\n\n - Support commissioning and ramp-up of new facilities, with significant travel to sites.\n\n - Contribute to Mariana’s culture of continuous improvement, innovation, and safety.\n \n \n\n\nWHAT YOU'LL BRING\n\n - Degree in Metallurgy, Chemical Engineering, or Process Engineering.\n\n - Hands-on mineral processing experience (zinc or copper preferred, broader base considered).\n\n - Proven ability to work independently in dynamic environments, with strong problem-solving skills.\n\n - Experience working in startup or entrepreneurial settings.\n\n\n\n\nDESIRED QUALIFICATIONS\n\n - Background in industrial technology or product development.\n\n - Experience collaborating with machine learning engineers or data scientists.\n\n - Exposure to digitized process monitoring and automation systems.\n \n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$100K – $160K","scrapeableCompensationSalarySummary":"$100K - $160K","compensationTiers":[{"id":"f3cd121e-6e47-415f-89c7-225244a4f3e6","tierSummary":"Estimated Base Salary, final salary depending on level, location, and other factors $100K – $160K","title":null,"additionalInformation":null,"components":[{"id":"557a730b-bd6d-430d-9872-f15ab196c955","summary":"Estimated Base Salary, final salary depending on level, location, and other factors $100K – $160K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":160000}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":160000}]}},{"id":"c615d7de-2702-4ecf-b929-1a1fdf36ca21","title":"Head of Creative ","department":"General","team":"General","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-08-20T22:37:59.772+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/c615d7de-2702-4ecf-b929-1a1fdf36ca21","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/c615d7de-2702-4ecf-b929-1a1fdf36ca21/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
The Head of Creative is responsible for the creative execution and visual identity of the company. Working directly with the Brand & Communications Lead, you'll establish the systems, standards, and creative direction that shape the company's public image and internal culture.
This role is ideal for someone who enjoys building from zero, thrives in fast-moving environments, and wants their work to have a lasting impact on a generational company.
What You'll Do
Own Mariana's brand architecture across the company and its assets
Own and evolve Mariana's visual identity
Design presentations, marketing collateral, and recruiting materials
Create website assets and digital campaigns
Design premium employee and customer merchandise
Develop scalable design systems and templates
Creative direction for photography and video
Develop visual concepts for marketing campaigns
Design podcast branding and graphics
Review and maintain quality across all creative output
Help shape the visual language of Mariana's culture
Maintain brand guidelines
Build and organize asset libraries
Establish creative workflows
Manage relationships with contract photographers, videographers, editors, and designers
Desired Qualifications
10+ years of experience in graphic design, creative direction, or brand design.
Portfolio demonstrating strong visual taste and execution in digital and physical formats.
Proficiency with Adobe Creative Suite and Figma.
Strong presentation and communication skills.
Ability to manage multiple projects simultaneously.
Comfortable working in a fast-paced startup environment.
Experience building brands from an early stage.
Additional Qualifications
Motion graphics or video art direction experience.
Industrial, technology, aerospace, automotive, or manufacturing brand experience.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nThe Head of Creative is responsible for the creative execution and visual identity of the company. Working directly with the Brand & Communications Lead, you'll establish the systems, standards, and creative direction that shape the company's public image and internal culture.\n\nThis role is ideal for someone who enjoys building from zero, thrives in fast-moving environments, and wants their work to have a lasting impact on a generational company.\n\nWhat You'll Do\n\n - Own Mariana's brand architecture across the company and its assets\n\n - Own and evolve Mariana's visual identity\n\n - Design presentations, marketing collateral, and recruiting materials\n\n - Create website assets and digital campaigns\n\n - Design premium employee and customer merchandise\n\n - Develop scalable design systems and templates\n\n - Creative direction for photography and video\n\n - Develop visual concepts for marketing campaigns\n\n - Design podcast branding and graphics\n\n - Review and maintain quality across all creative output\n\n - Help shape the visual language of Mariana's culture\n\n - Maintain brand guidelines\n\n - Build and organize asset libraries\n\n - Establish creative workflows\n\n - Manage relationships with contract photographers, videographers, editors, and designers\n\nDesired Qualifications\n\n - 10+ years of experience in graphic design, creative direction, or brand design.\n\n - Portfolio demonstrating strong visual taste and execution in digital and physical formats.\n\n - Proficiency with Adobe Creative Suite and Figma.\n\n - Strong presentation and communication skills.\n\n - Ability to manage multiple projects simultaneously.\n\n - Comfortable working in a fast-paced startup environment.\n\n - Experience building brands from an early stage.\n\nAdditional Qualifications\n\n - Motion graphics or video art direction experience.\n\n - Industrial, technology, aerospace, automotive, or manufacturing brand experience.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $200K","compensationTiers":[{"id":"770743b2-dd1e-4a03-b960-13f22ed5c35a","tierSummary":"$150K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"929f0ed6-8ff9-4a2d-b26d-4a946743296d","summary":"$150K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"id":"902d521c-ceba-4d14-a7d3-3903e50b8ac2","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"eb4ae9d1-5060-44a3-934b-67610e772bf6","title":"Sr. Procurement Specialist - Process Equipment","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-08-20T16:28:39.195+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/eb4ae9d1-5060-44a3-934b-67610e772bf6","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/eb4ae9d1-5060-44a3-934b-67610e772bf6/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals seeks a hands-on, commercially savvy Sr. Procurement Specialist – Process Equipment to drive capital project delivery by overseeing end-to-end procurement of capital equipment. This role isn’t about transactional purchasing—here, you’ll manage defined procurement scopes from strategy development through contract award and execution, directly impacting project schedules and capital efficiency.
Lead pre-award, award, and post-award contracting activities for capital equipment purchases
Develop and execute procurement strategies aligned with project timelines and critical path needs
Drive commercial negotiations with focus on total cost, risk allocation, and delivery certainty
Support PO conversion, approvals, and procurement system processing
Draft, review, and negotiate NDAs, MSAs, and equipment purchase agreements
Coordinate change orders and commercial amendments with project teams
Ensure documentation is structured, defensible, and audit-ready
Analyze spend data and identify cost savings or value-creation opportunities
Foster competition in the supplier market
Conduct commercial risk assessments to minimize supply chain and schedule risks
Help design scalable procurement processes as Mariana Minerals grows
Improve cycle times and streamline sourcing and approval workflows
Contribute to establishing a disciplined, data-driven procurement function from the ground up
5–7+ years of procurement experience in equipment purchasing and heavy industry
Proven experience managing competitive sourcing processes for capital equipment
Strong contract negotiation skills
In-depth understanding of commercial risk allocation
Proficiency with ERP/procurement systems and structured documentation
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nMariana Minerals seeks a hands-on, commercially savvy Sr. Procurement Specialist – Process Equipment to drive capital project delivery by overseeing end-to-end procurement of capital equipment. This role isn’t about transactional purchasing—here, you’ll manage defined procurement scopes from strategy development through contract award and execution, directly impacting project schedules and capital efficiency.\n\n \n\n\nWHAT YOU’LL DO\n\n\nOWN CAPITAL PROCUREMENT WORKSTREAMS\n\n - Lead pre-award, award, and post-award contracting activities for capital equipment purchases\n\n - Develop and execute procurement strategies aligned with project timelines and critical path needs\n\n - Drive commercial negotiations with focus on total cost, risk allocation, and delivery certainty\n\n - Support PO conversion, approvals, and procurement system processing\n\n\nMANAGE CONTRACTS & COMMERCIAL RISK\n\n - Draft, review, and negotiate NDAs, MSAs, and equipment purchase agreements\n\n - Coordinate change orders and commercial amendments with project teams\n\n - Ensure documentation is structured, defensible, and audit-ready\n\n\nDRIVE COST & VALUE\n\n - Analyze spend data and identify cost savings or value-creation opportunities\n\n - Foster competition in the supplier market\n\n - Conduct commercial risk assessments to minimize supply chain and schedule risks\n\n\nBUILD BETTER SYSTEMS\n\n - Help design scalable procurement processes as Mariana Minerals grows\n\n - Improve cycle times and streamline sourcing and approval workflows\n\n - Contribute to establishing a disciplined, data-driven procurement function from the ground up\n\n \n\n\nWHAT YOU’LL BRING\n\n - 5–7+ years of procurement experience in equipment purchasing and heavy industry\n\n - Proven experience managing competitive sourcing processes for capital equipment\n\n - Strong contract negotiation skills\n\n - In-depth understanding of commercial risk allocation\n\n - Proficiency with ERP/procurement systems and structured documentation\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$90K – $126K • Offers Equity","scrapeableCompensationSalarySummary":"$90K - $126K","compensationTiers":[{"id":"82b6a64a-2bf9-425b-94cc-54d369ff9326","tierSummary":"$90K – $126K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"388f16df-6602-4188-8960-f3d112ab3d91","summary":"$90K – $126K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":90000,"maxValue":126000},{"id":"73d29188-e39d-430f-ac8f-62a8bacd1162","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":90000,"maxValue":126000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"37a552a1-2d7a-431c-b92b-3ddf841e73bf","title":"Maintenance Technician, Electrical ","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"East Texas","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-07T23:58:56.998+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Joaquin"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/37a552a1-2d7a-431c-b92b-3ddf841e73bf","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/37a552a1-2d7a-431c-b92b-3ddf841e73bf/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Maintenance Technician (Electrical) supports safe, reliable operation of the electrical, control, and instrumentation systems at Lithium One in Joaquin, TX. In this role, you will install, test, and maintain motors, switchgear, breakers, and motor control centers, then troubleshoot PLCs, relay systems, and instrumentation when something goes wrong. You will play a critical role in keeping production steady and downtime low, and you will have a real hand in building our maintenance program from the ground up, including finding ways to simplify or automate repetitive maintenance tasks. As a startup, the first 6-8 months will include work beyond your electrical specialty, such as mechanical troubleshooting, so the ideal fit is someone who loves variety and wants to build something.
Responsibilities
Install, maintain, repair, and test electrical, control, communication, and measurement equipment, including medium and low voltage motors, switchgear, breakers, and motor control centers
Troubleshoot and diagnose issues with PLCs, relay systems, and instrumentation across the Lithium One plant, supporting both planned maintenance and unplanned breakdowns, finding the root cause and making timely repairs
Keep production steady by minimizing downtime and completing work to manufacturer specifications, electrical codes, and quality standards
Perform and document accurate preventive maintenance, inspections, and calibration on electrical and instrumentation equipment, and recommend equipment for inclusion in preventive maintenance programs
Read one-line diagrams, schematics, and blueprints, calculate circuit load requirements, and log work, parts used, and equipment condition in our in-house CMMS
Work with operations, engineering, and the mechanical and controls techs, support pump, motor, and valve repair, and communicate potential hazards to engineers, mechanics, and operators
Follow all OSHA and company safety procedures (including lockout/tagout, confined space, and traffic rules), actively participate in safety meetings, and immediately report hazards, near misses, or equipment damage while ensuring operations meet environmental and regulatory standards
Qualifications & Experience
Associate's degree in electrical, electronics, or instrumentation preferred (or equivalent experience)
Proven industrial maintenance or electrical experience, 3+ years
Hands-on experience with motors, PLCs, switchgear, breakers, motor control centers, relay systems, and instrumentation
Experience in an oil & gas, water treatment, chemical processing, or similar industrial setting (oil & gas highly preferred; hydrometallurgy, mining, or battery materials experience is a plus)
Ability to explain how you approach planned vs. unplanned maintenance, including how you troubleshoot when equipment fails unexpectedly
Working knowledge of electrical power and distribution systems and local, state, and national electrical codes
Ability to read one-line diagrams, schematics, and technical documentation
Mechanical aptitude and willingness to support pump, motor, valve, and piping work
Strong communication across shifts and good computer skills; CMMS experience preferred
Valid driver's license
Schedule
12-hour shifts (6am-6pm)
Sunday-Tuesday plus every other Wednesday, or Thursday-Saturday plus every other Wednesday
A night rotation will be added in the near future
Working Environment & Physical Requirements
Work in the processing plant and shop, in all weather conditions including extreme temperatures, with exposure to chemicals and other hazardous materials
Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods
Ability to climb ladders and structures, with the manual dexterity to use hand and power tools
Must wear and use all required PPE
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Maintenance Technician (Electrical) supports safe, reliable operation of the electrical, control, and instrumentation systems at Lithium One in Joaquin, TX. In this role, you will install, test, and maintain motors, switchgear, breakers, and motor control centers, then troubleshoot PLCs, relay systems, and instrumentation when something goes wrong. You will play a critical role in keeping production steady and downtime low, and you will have a real hand in building our maintenance program from the ground up, including finding ways to simplify or automate repetitive maintenance tasks. As a startup, the first 6-8 months will include work beyond your electrical specialty, such as mechanical troubleshooting, so the ideal fit is someone who loves variety and wants to build something.\n\nResponsibilities\n\n - Install, maintain, repair, and test electrical, control, communication, and measurement equipment, including medium and low voltage motors, switchgear, breakers, and motor control centers\n\n - Troubleshoot and diagnose issues with PLCs, relay systems, and instrumentation across the Lithium One plant, supporting both planned maintenance and unplanned breakdowns, finding the root cause and making timely repairs\n\n - Keep production steady by minimizing downtime and completing work to manufacturer specifications, electrical codes, and quality standards\n\n - Perform and document accurate preventive maintenance, inspections, and calibration on electrical and instrumentation equipment, and recommend equipment for inclusion in preventive maintenance programs\n\n - Read one-line diagrams, schematics, and blueprints, calculate circuit load requirements, and log work, parts used, and equipment condition in our in-house CMMS\n\n - Work with operations, engineering, and the mechanical and controls techs, support pump, motor, and valve repair, and communicate potential hazards to engineers, mechanics, and operators\n\n - Follow all OSHA and company safety procedures (including lockout/tagout, confined space, and traffic rules), actively participate in safety meetings, and immediately report hazards, near misses, or equipment damage while ensuring operations meet environmental and regulatory standards\n\nQualifications & Experience\n\n - Associate's degree in electrical, electronics, or instrumentation preferred (or equivalent experience)\n\n - Proven industrial maintenance or electrical experience, 3+ years\n\n - Hands-on experience with motors, PLCs, switchgear, breakers, motor control centers, relay systems, and instrumentation\n\n - Experience in an oil & gas, water treatment, chemical processing, or similar industrial setting (oil & gas highly preferred; hydrometallurgy, mining, or battery materials experience is a plus)\n\n - Ability to explain how you approach planned vs. unplanned maintenance, including how you troubleshoot when equipment fails unexpectedly\n\n - Working knowledge of electrical power and distribution systems and local, state, and national electrical codes\n\n - Ability to read one-line diagrams, schematics, and technical documentation\n\n - Mechanical aptitude and willingness to support pump, motor, valve, and piping work\n\n - Strong communication across shifts and good computer skills; CMMS experience preferred\n\n - Valid driver's license\n\nSchedule\n\n - 12-hour shifts (6am-6pm)\n\n - Sunday-Tuesday plus every other Wednesday, or Thursday-Saturday plus every other Wednesday\n\n - A night rotation will be added in the near future\n\nWorking Environment & Physical Requirements\n\n - Work in the processing plant and shop, in all weather conditions including extreme temperatures, with exposure to chemicals and other hazardous materials\n\n - Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods\n\n - Ability to climb ladders and structures, with the manual dexterity to use hand and power tools\n\n - Must wear and use all required PPE\n\n\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"c9be8e0d-bb09-4792-954e-10451b170108","title":"Machine Learning Engineer (Autonomy) ","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-08-21T17:52:54.209+00:00","isListed":true,"isRemote":true,"workplaceType":"Hybrid","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/c9be8e0d-bb09-4792-954e-10451b170108","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/c9be8e0d-bb09-4792-954e-10451b170108/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring Machine Learning Engineers (Autonomy) to build the autonomy and sensor-integration software that lets our mining vehicles perceive, decide, and drive themselves.
In this role you will work on parts of the software and sensor integration that enables full mining autonomy — sensor fusion across LiDAR, cameras, radar, and IMU/GNSS; perception, localization, and mapping; and the autonomy stack that turns sensing into safe vehicle motion. You will carry work from architecture and algorithm design through implementation, simulation, and bench and field validation, working hand in hand with our hardware, controls, and systems-engineering teams. This is a hands-on, first-principles role for an engineer who wants to develop the world’s first fully autonomous mines.
Develop autonomy software for autonomous mining vehicles focusing on one or more area: perception, SLAM, motion planning, and control
Integrate and calibrate the sensing suite (LiDAR, cameras, radar, IMU, GNSS), implementing sensor fusion and time synchronization robust to dust, vibration, and corrosion-heavy mining environments
Build and maintain embedded and real-time software that bridges sensing, compute, and actuation, with attention to safety, latency, and reliability
Develop simulation, logging, and data pipelines to test autonomy behavior and drive performance against safety and availability targets
Build bench, rig, and field validation of the autonomy stack, debugging across the full software-hardware boundary
Collaborate with hardware and controls engineers to integrate sensing, compute, and actuation into a complete vehicle
Bachelor's degree in Mechatronics, Robotics, Computer Science, Electrical, or related engineering discipline
2+ years developing autonomy, robotics, or embedded software, ideally for mobile robots or vehicles
Strong proficiency in C++ and/or Python, and with a robotics middleware such as ROS/ROS 2
Hands-on experience with sensor integration and fusion - LiDAR, cameras, radar, IMU, GNSS - and with perception, localization, or motion-planning algorithms
Working knowledge of real-time and embedded systems, and of the controls and software-hardware integration that drive actuation
Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nWe are hiring Machine Learning Engineers (Autonomy) to build the autonomy and sensor-integration software that lets our mining vehicles perceive, decide, and drive themselves.\n\nIn this role you will work on parts of the software and sensor integration that enables full mining autonomy — sensor fusion across LiDAR, cameras, radar, and IMU/GNSS; perception, localization, and mapping; and the autonomy stack that turns sensing into safe vehicle motion. You will carry work from architecture and algorithm design through implementation, simulation, and bench and field validation, working hand in hand with our hardware, controls, and systems-engineering teams. This is a hands-on, first-principles role for an engineer who wants to develop the world’s first fully autonomous mines.\n\n\n\n\nWHAT YOU’LL DO\n\n - Develop autonomy software for autonomous mining vehicles focusing on one or more area: perception, SLAM, motion planning, and control\n\n - Integrate and calibrate the sensing suite (LiDAR, cameras, radar, IMU, GNSS), implementing sensor fusion and time synchronization robust to dust, vibration, and corrosion-heavy mining environments\n\n - Build and maintain embedded and real-time software that bridges sensing, compute, and actuation, with attention to safety, latency, and reliability\n\n - Develop simulation, logging, and data pipelines to test autonomy behavior and drive performance against safety and availability targets\n\n - Build bench, rig, and field validation of the autonomy stack, debugging across the full software-hardware boundary\n\n - Collaborate with hardware and controls engineers to integrate sensing, compute, and actuation into a complete vehicle\n\n\n\n\nWHAT YOU’LL BRING\n\n - Bachelor's degree in Mechatronics, Robotics, Computer Science, Electrical, or related engineering discipline\n\n - 2+ years developing autonomy, robotics, or embedded software, ideally for mobile robots or vehicles\n\n - Strong proficiency in C++ and/or Python, and with a robotics middleware such as ROS/ROS 2\n\n - Hands-on experience with sensor integration and fusion - LiDAR, cameras, radar, IMU, GNSS - and with perception, localization, or motion-planning algorithms\n\n - Working knowledge of real-time and embedded systems, and of the controls and software-hardware integration that drive actuation\n\n - Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $180K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $180K","compensationTiers":[{"id":"72973d8d-36cc-498a-b06a-fb43a7f1025a","tierSummary":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors. $140K – $180K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"89f83f7b-768c-4ee9-8d45-0b2bace6658d","summary":"Estimated Base Salary, Final salary dependent on level of experience, location, and other factors. $140K – $180K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":180000},{"id":"5ec73859-d081-4658-94e7-f97cd98b6375","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":180000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"a61ece5b-1e04-420e-8504-ae594149be52","title":"Process Engineer","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"East Texas","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-08-24T16:56:44.934+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Joaquin"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/a61ece5b-1e04-420e-8504-ae594149be52","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/a61ece5b-1e04-420e-8504-ae594149be52/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Position Summary:
We are looking for a Senior Process Engineer to work with our innovative, fast-paced multidisciplinary team. They will be responsible for liaising between R&D and operations, with a focus on chemical process development, successful scale-up of new product execution, and sustaining technology-manufacturing readiness. This person must be flexible, proactive, and professional with experience in scale-up and process development applications such as chemical refining, hydrometallurgy, minerals, and chemical processing.
Key Responsibilities:
Lead the development and scale-up of lab processes on pilot and production scales, with a focus on improving metal recovery and reducing cost and environmental impact.
Identify potential process risks, and propose, and evaluate solutions to mitigate the risks.
Evaluate process capability, improve process control, and deliver samples to customers.
Conduct detailed process simulations and modeling to predict process behaviors under various scenarios.
Develop, prepare, and provide detailed production and process guidelines, including: standard operating procedures (SOPs), process flow details, safety, and quality standards.
Improve and troubleshoot products, equipment, and process issues during production.
Provide technical leadership and mentorship to junior scientists, engineers, and technical staff.
Guide the R&D team and any external partners in the design and execution of experiments to develop the required base data for chemical process design.
Drive chemical process design and development from the concept stages to scaled production, ensuring quality is maintained throughout the lifecycle of the project.
Develop and model potential process designs for scale-up and cost estimating based on lab-scale chemical processes.
Identify potential process risks, and propose, and evaluate solutions to mitigate the risks.
Evaluate process capability and improve process control.
Required Qualifications:
A bachelor’s degree in chemical engineering or a related discipline is required.
3-5 years of experience in Chemical Process and/or Development Engineering required.
Hands-on experience scaling processes from R&D to an operating environment.
Expertise in process modeling, development, control, and scale-up.
Coordinate and execute bench-top, pilot, manufacturing scale-up, and verification batches with speed and robustness.
Proficient in using software for process analysis and modeling.
Sound understanding of chemical processes and their scale-up.
Strong leadership and interpersonal skills for implementation of cross-functional process improvements.
Strong background in analytical & quantitative skills for problem-solving of large/complex problems & proven ability in decision-making
Desired Qualifications:
Hydrometallurgy experience
Mining experience
Battery material experience
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nPosition Summary:\n\nWe are looking for a Senior Process Engineer to work with our innovative, fast-paced multidisciplinary team. They will be responsible for liaising between R&D and operations, with a focus on chemical process development, successful scale-up of new product execution, and sustaining technology-manufacturing readiness. This person must be flexible, proactive, and professional with experience in scale-up and process development applications such as chemical refining, hydrometallurgy, minerals, and chemical processing.\n\n\n\nKey Responsibilities:\n\n - Lead the development and scale-up of lab processes on pilot and production scales, with a focus on improving metal recovery and reducing cost and environmental impact.\n\n - Identify potential process risks, and propose, and evaluate solutions to mitigate the risks.\n\n - Evaluate process capability, improve process control, and deliver samples to customers.\n\n - Conduct detailed process simulations and modeling to predict process behaviors under various scenarios.\n\n - Develop, prepare, and provide detailed production and process guidelines, including: standard operating procedures (SOPs), process flow details, safety, and quality standards.\n\n - Improve and troubleshoot products, equipment, and process issues during production.\n\n - Provide technical leadership and mentorship to junior scientists, engineers, and technical staff.\n\n - Guide the R&D team and any external partners in the design and execution of experiments to develop the required base data for chemical process design.\n\n - Drive chemical process design and development from the concept stages to scaled production, ensuring quality is maintained throughout the lifecycle of the project.\n\n - Develop and model potential process designs for scale-up and cost estimating based on lab-scale chemical processes.\n\n - Identify potential process risks, and propose, and evaluate solutions to mitigate the risks.\n\n - Evaluate process capability and improve process control.\n\n\n\nRequired Qualifications:\n\n - A bachelor’s degree in chemical engineering or a related discipline is required.\n\n - 3-5 years of experience in Chemical Process and/or Development Engineering required.\n\n - Hands-on experience scaling processes from R&D to an operating environment.\n\n - Expertise in process modeling, development, control, and scale-up.\n\n - Coordinate and execute bench-top, pilot, manufacturing scale-up, and verification batches with speed and robustness.\n\n - Proficient in using software for process analysis and modeling.\n\n - Sound understanding of chemical processes and their scale-up.\n\n - Strong leadership and interpersonal skills for implementation of cross-functional process improvements.\n\n - Strong background in analytical & quantitative skills for problem-solving of large/complex problems & proven ability in decision-making\n\n\n\nDesired Qualifications:\n\n - Hydrometallurgy experience\n\n - Mining experience\n\n - Battery material experience\n\n\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"42d74030-792c-44d6-9d93-6c0623d19cf7","title":"Administrative Assistant ","department":"General","team":"General","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-08-26T19:07:40.296+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/42d74030-792c-44d6-9d93-6c0623d19cf7","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/42d74030-792c-44d6-9d93-6c0623d19cf7/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are seeking a highly organized and proactive Administrative Assistant to support day-to-day administrative operations at our Houston office. This role is ideal for someone early in their career who is detail-oriented, resourceful, and eager to grow within an operations or executive support function.
The Administrative Assistant will provide administrative support to the CFO, including calendar and travel coordination and expense management, while also supporting day-to-day office operations. The role will also serve as backup to the Executive Assistant as needed. This position requires strong communication skills, flexibility, sound judgment, and the ability to manage competing priorities in a fast-paced environment.
Administrative & Calendar Support
Assist with scheduling meetings, managing calendars, and coordinating internal and external appointments
Help prepare meeting materials, agendas, and notes as needed
Support coordination of cross-functional meetings and company events
Travel & Logistics
Book and manage domestic and international travel (flights, hotels, ground transportation)
Handle last-minute travel changes and troubleshoot logistical issues
Expense & Reporting Support
Prepare and submit expense reports in a timely and accurate manner
Reconcile receipts and assist with tracking budgets or spending reports
On-Site & Office Support
Provide in-office support as needed
Coordinate office supplies, deliveries, and facilities-related requests
Assist with visitor management and on-site meeting logistics
Support internal events and team off-sites
Executive Assistant Backup
Serve as backup to the Executive Assistant during absences
Provide overflow support during high-volume periods
Assist with special projects and ad hoc requests
1–3+ years of administrative or office support experience preferred
Strong organizational skills and attention to detail
Excellent written and verbal communication skills
Proficiency in Microsoft Office
Experience with expense management and calendar systems preferred
Ability to handle confidential information with discretion
Strong time management and prioritization skills
Problem-solving mindset
Professional and service-oriented approach
Adaptability in a fast-paced environment
Team player with a positive attitude
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe are seeking a highly organized and proactive Administrative Assistant to support day-to-day administrative operations at our Houston office. This role is ideal for someone early in their career who is detail-oriented, resourceful, and eager to grow within an operations or executive support function.\n\nThe Administrative Assistant will provide administrative support to the CFO, including calendar and travel coordination and expense management, while also supporting day-to-day office operations. The role will also serve as backup to the Executive Assistant as needed. This position requires strong communication skills, flexibility, sound judgment, and the ability to manage competing priorities in a fast-paced environment.\n\n\nWHAT YOU’LL DO\n\nAdministrative & Calendar Support\n\n - Assist with scheduling meetings, managing calendars, and coordinating internal and external appointments\n\n - Help prepare meeting materials, agendas, and notes as needed\n\n - Support coordination of cross-functional meetings and company events\n\nTravel & Logistics\n\n - Book and manage domestic and international travel (flights, hotels, ground transportation)\n\n - Handle last-minute travel changes and troubleshoot logistical issues\n\nExpense & Reporting Support\n\n - Prepare and submit expense reports in a timely and accurate manner\n\n - Reconcile receipts and assist with tracking budgets or spending reports\n\nOn-Site & Office Support\n\n - Provide in-office support as needed\n\n - Coordinate office supplies, deliveries, and facilities-related requests\n\n - Assist with visitor management and on-site meeting logistics\n\n - Support internal events and team off-sites\n\nExecutive Assistant Backup\n\n - Serve as backup to the Executive Assistant during absences\n\n - Provide overflow support during high-volume periods\n\n - Assist with special projects and ad hoc requests \n\n\nDESIRED QUALIFICATIONS\n\n - 1–3+ years of administrative or office support experience preferred\n\n - Strong organizational skills and attention to detail\n\n - Excellent written and verbal communication skills\n\n - Proficiency in Microsoft Office\n\n - Experience with expense management and calendar systems preferred\n\n - Ability to handle confidential information with discretion\n\n - Strong time management and prioritization skills\n\n - Problem-solving mindset\n\n - Professional and service-oriented approach\n\n - Adaptability in a fast-paced environment\n\n - Team player with a positive attitude \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"8cf80cb4-ea4f-428f-8b8e-9cd320bc5fed","title":"Lead Operator","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"East Texas","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-08-26T17:21:36.608+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Joaquin"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/8cf80cb4-ea4f-428f-8b8e-9cd320bc5fed","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/8cf80cb4-ea4f-428f-8b8e-9cd320bc5fed/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Position Summary
We are looking for an Operator Lead to oversee shift-level plant operations at our Joaquin, TX facility, directing a small crew of operators through daily production activities while monitoring and controlling process equipment to meet quality, safety, and production targets. Our Operator Lead will serve as the primary point of contact between the shift crew and the Director of Operations / Process Engineering team, ensuring operations run efficiently, safely, and in compliance with standard operating procedures. This professional must be able to work in all areas of the plant, direct others under variable conditions, and exercise sound judgment with minimum supervision.
Duties and Responsibilities
Lead and coordinate the shift crew, assigning tasks and priorities across production areas at the start of and throughout each shift.
Conduct shift-start safety stand-downs and communicate priorities, hazards, and operational status to the crew.
Monitor and control process equipment (tanks, pumps, filter presses, reactors, dryers, and packaging equipment) via HMI and manual checks to maintain plant parameters within target ranges.
Direct loading/unloading of trucks, cleaning of filter presses, and packaging of products.
Respond to process upsets and abnormal conditions, escalating to the Maintenance team or Process Engineer as needed and authorizing lockout/tagout for repairs.
Review shift logs, production data, and quality results; ensure accurate and timely documentation of plant activity in log sheets and the CMMS/plant systems.
Coordinate with Maintenance to prioritize and schedule repairs and preventive maintenance without disrupting production.
Perform and verify routine safety and housekeeping inspections across assigned plant areas.
Train and mentor operators on procedures, safety protocols, and equipment operation.
Support plant start-up, shutdown, and commissioning activities as needed.
Required Qualifications
Minimum 2-4 years of plant or industrial operations experience, with prior experience directing or leading a small team preferred.
Manufacturing, chemical processing, or industrial plant experience is preferred but not required; strong candidates from other operational backgrounds will be considered.
Ability to read and interpret P&IDs, standard operating procedures, and equipment manuals.
Comfortable working with industrial chemicals and process equipment, and following established safety protocols.
Sound troubleshooting skills, with the ability to identify process or equipment issues and determine appropriate corrective action or escalation.
Strong attention to detail with solid record-keeping and basic mathematical skills.
Ability to work in an environment involving exposure to chemicals, fumes, dust, and varying weather conditions, using required PPE.
Ability to lift a minimum of 50 pounds and work in and around industrial equipment.
The use of the following software could be required: Microsoft Office (Excel, Word, Power Point, Outlook), Skype, Visio, Adobe (PDF), Share Point, SAP, Microsoft Project.
Willingness to work rotating shifts, including nights, weekends, and holidays as required by plant operations.
Hydrometallurgy experience Mining experience Battery material experience (desired)
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nPosition Summary\n\nWe are looking for an Operator Lead to oversee shift-level plant operations at our Joaquin, TX facility, directing a small crew of operators through daily production activities while monitoring and controlling process equipment to meet quality, safety, and production targets. Our Operator Lead will serve as the primary point of contact between the shift crew and the Director of Operations / Process Engineering team, ensuring operations run efficiently, safely, and in compliance with standard operating procedures. This professional must be able to work in all areas of the plant, direct others under variable conditions, and exercise sound judgment with minimum supervision.\n\n\n\nDuties and Responsibilities\n\n - Lead and coordinate the shift crew, assigning tasks and priorities across production areas at the start of and throughout each shift.\n\n - Conduct shift-start safety stand-downs and communicate priorities, hazards, and operational status to the crew.\n\n - Monitor and control process equipment (tanks, pumps, filter presses, reactors, dryers, and packaging equipment) via HMI and manual checks to maintain plant parameters within target ranges.\n\n - Direct loading/unloading of trucks, cleaning of filter presses, and packaging of products.\n\n - Respond to process upsets and abnormal conditions, escalating to the Maintenance team or Process Engineer as needed and authorizing lockout/tagout for repairs.\n\n - Review shift logs, production data, and quality results; ensure accurate and timely documentation of plant activity in log sheets and the CMMS/plant systems.\n\n - Coordinate with Maintenance to prioritize and schedule repairs and preventive maintenance without disrupting production.\n\n - Perform and verify routine safety and housekeeping inspections across assigned plant areas.\n\n - Train and mentor operators on procedures, safety protocols, and equipment operation.\n\n - Support plant start-up, shutdown, and commissioning activities as needed.\n\n\n\nRequired Qualifications\n\n - Minimum 2-4 years of plant or industrial operations experience, with prior experience directing or leading a small team preferred.\n\n - Manufacturing, chemical processing, or industrial plant experience is preferred but not required; strong candidates from other operational backgrounds will be considered.\n\n - Ability to read and interpret P&IDs, standard operating procedures, and equipment manuals.\n\n - Comfortable working with industrial chemicals and process equipment, and following established safety protocols.\n\n - Sound troubleshooting skills, with the ability to identify process or equipment issues and determine appropriate corrective action or escalation.\n\n - Strong attention to detail with solid record-keeping and basic mathematical skills.\n\n - Ability to work in an environment involving exposure to chemicals, fumes, dust, and varying weather conditions, using required PPE.\n\n - Ability to lift a minimum of 50 pounds and work in and around industrial equipment.\n\n - The use of the following software could be required: Microsoft Office (Excel, Word, Power Point, Outlook), Skype, Visio, Adobe (PDF), Share Point, SAP, Microsoft Project.\n\n - Willingness to work rotating shifts, including nights, weekends, and holidays as required by plant operations.\n\n - Hydrometallurgy experience Mining experience Battery material experience (desired)\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"0962868f-6ea6-474f-8378-6d047b2d3d83","title":"Sr. Systems Administrator","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Moab, UT","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}}}],"publishedAt":"2026-08-26T18:29:04.254+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/0962868f-6ea6-474f-8378-6d047b2d3d83","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/0962868f-6ea6-474f-8378-6d047b2d3d83/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring a Sr. Systems Administrator to take primary ownership of hands-on systems administration, infrastructure implementation, and day-to-day user support across Mariana's corporate, field, and industrial sites, freeing the Senior IT Manager to focus on architecture, budget, and cross-organizational strategy.
This is a foundational, builder-oriented role rather than a purely operational one. Core capabilities such as device management, centralized authentication, backup and disaster recovery, incident response, and change management are still being established, and this person will help build them, not just run them. Because Mariana operates a live mine, a greenfield construction site, and growing pilot facilities at the same time, the role requires close coordination with Controls/OT engineering, Software Engineering, HR, managed service providers, and on-site stakeholders to deliver urgent requirements while ensuring they support longer-term infrastructure direction.
Administer Microsoft 365, Entra ID, and centralized authentication/SSO across corporate and field sites
Own the technical layer of SharePoint (permissions, architecture, governance) and manage user access, device provisioning, and onboarding/offboarding with HR.
Maintain software and SaaS license management, including renewals, entitlements, and cost optimization.
Establish end-to-end hardware lifecycle management — procurement, provisioning, tracking, and retirement — across offices, pilot facilities, and field sites.
Configure and support routers, switches, firewalls, VPNs, and wireless networks across a multi-site environment, and drive network monitoring, segmentation, and IT/OT boundary improvements.
Build and document backup/disaster recovery plans, security controls, vulnerability management, and a formal incident response and change management process.
Coordinate and hold accountable managed service providers and consultants
Serve as the primary escalation point for complex user and site support issues, and develop help desk process, documentation, and SLAs.
Mentor junior IT staff and build documentation/training that grows the team's overall technical depth.
5+ years in systems and network administration with end-to-end ownership of infrastructure projects, not just ticket-based support.
Deep hands-on experience with Microsoft 365 and Entra ID, including centralized authentication and SSO configuration.
Strong networking fundamentals — VLANs/segmentation, firewalls, VPNs, wireless, routing/switching — with direct enterprise hardware experience.
Working proficiency in PowerShell or similar scripting for administration and automation.
Experience managing organization-level software/service licensing, including renewals and vendor coordination.
A track record of building processes, systems, or tools from scratch, and comfort operating with incomplete documentation and ambiguity.
Experience coordinating or overseeing managed service providers or outside consultants.
Preferred: experience in industrial/mining/OT-adjacent environments, familiarity with NIST SP 800-171/CMMC/ISO 27001, and experience with Apple/Mac devices and Ubiquiti networking.
This role requires approximately 25% travel to Mariana’s other offices and project sites.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe are hiring a Sr. Systems Administrator to take primary ownership of hands-on systems administration, infrastructure implementation, and day-to-day user support across Mariana's corporate, field, and industrial sites, freeing the Senior IT Manager to focus on architecture, budget, and cross-organizational strategy.\n\nThis is a foundational, builder-oriented role rather than a purely operational one. Core capabilities such as device management, centralized authentication, backup and disaster recovery, incident response, and change management are still being established, and this person will help build them, not just run them. Because Mariana operates a live mine, a greenfield construction site, and growing pilot facilities at the same time, the role requires close coordination with Controls/OT engineering, Software Engineering, HR, managed service providers, and on-site stakeholders to deliver urgent requirements while ensuring they support longer-term infrastructure direction.\n\n\n\n\nWHAT YOU'LL DO\n\n - Administer Microsoft 365, Entra ID, and centralized authentication/SSO across corporate and field sites\n\n - Own the technical layer of SharePoint (permissions, architecture, governance) and manage user access, device provisioning, and onboarding/offboarding with HR.\n\n - Maintain software and SaaS license management, including renewals, entitlements, and cost optimization.\n\n - Establish end-to-end hardware lifecycle management — procurement, provisioning, tracking, and retirement — across offices, pilot facilities, and field sites.\n\n - Configure and support routers, switches, firewalls, VPNs, and wireless networks across a multi-site environment, and drive network monitoring, segmentation, and IT/OT boundary improvements.\n\n - Build and document backup/disaster recovery plans, security controls, vulnerability management, and a formal incident response and change management process.\n\n - Coordinate and hold accountable managed service providers and consultants\n\n - Serve as the primary escalation point for complex user and site support issues, and develop help desk process, documentation, and SLAs.\n\n - Mentor junior IT staff and build documentation/training that grows the team's overall technical depth.\n \n \n\n\nDESIRED QUALIFICATIONS\n\n - 5+ years in systems and network administration with end-to-end ownership of infrastructure projects, not just ticket-based support.\n\n - Deep hands-on experience with Microsoft 365 and Entra ID, including centralized authentication and SSO configuration.\n\n - Strong networking fundamentals — VLANs/segmentation, firewalls, VPNs, wireless, routing/switching — with direct enterprise hardware experience.\n\n - Working proficiency in PowerShell or similar scripting for administration and automation.\n\n - Experience managing organization-level software/service licensing, including renewals and vendor coordination.\n\n - A track record of building processes, systems, or tools from scratch, and comfort operating with incomplete documentation and ambiguity.\n\n - Experience coordinating or overseeing managed service providers or outside consultants.\n\n - Preferred: experience in industrial/mining/OT-adjacent environments, familiarity with NIST SP 800-171/CMMC/ISO 27001, and experience with Apple/Mac devices and Ubiquiti networking.\n\n - This role requires approximately 25% travel to Mariana’s other offices and project sites.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$130K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$130K - $200K","compensationTiers":[{"id":"ffb14489-4d91-4f29-a0e9-07e89e583c58","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $130K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"36875c58-86d4-456a-b1d1-b3fd96b62939","summary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $130K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":130000,"maxValue":200000},{"id":"e15e0ed5-ec2d-4780-b81c-32b086aa9704","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":130000,"maxValue":200000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"dcc52a32-d608-44c7-a40d-c8af3d44c810","title":"Staff Process Controls Engineer - Networking and Systems Administration","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-09-04T23:00:16.373+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/dcc52a32-d608-44c7-a40d-c8af3d44c810","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/dcc52a32-d608-44c7-a40d-c8af3d44c810/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
Mariana Minerals is looking for a highly motivated Controls Engineer to work on building the critical minerals supply chain.
As the I&C Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide controls infrastructure scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team.
What You’ll Do
Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp
Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes
Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes
Support the hiring, mentorship, and day-to-day management of junior engineers
Lead selection, procurement, calibration, and installation of instruments, valves, and analyzers
Support development of machine learning applications with an emphasis on control and optimization of industrial facilities
Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms
What You’ll Bring
Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems
Experience with equipment engineering and design. Including but not limited to:
Brownfield equipment modifications and upgrades
Greenfield equipment design
Evaluation and optimization of operating equipment
Operations support
Strong I&C fundamentals
Minimum 7 years direct experience in networking and systems administration for control systems, including
Network architecture design, procurement, installation, and commissioning
Experience managing fiber installation
Expert-level knowledge in Ignition
Experience managing the plant network and interfacing securely with the business network
Review of P&IDs in the development of system architecture drawings
Experience with control system programming
Experience with the following industries and/or production environments:
Industrial manufacturing
Large-scale mining or mineral processing
Large-scale chemical production processes
Engineering, procurement, and construction firms
Experience with direct or indirect leadership of engineers and technicians
Experience with project management and execution of medium to large scale (>$5M) capital projects
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nMariana Minerals is looking for a highly motivated Controls Engineer to work on building the critical minerals supply chain.\n\nAs the I&C Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide controls infrastructure scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team.\n\n\n\nWhat You’ll Do\n\n - Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp\n\n - Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes\n\n - Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes\n\n - Support the hiring, mentorship, and day-to-day management of junior engineers\n\n - Lead selection, procurement, calibration, and installation of instruments, valves, and analyzers\n\n - Support development of machine learning applications with an emphasis on control and optimization of industrial facilities\n\n - Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms\n\n\n\nWhat You’ll Bring\n\n - Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems\n\nExperience with equipment engineering and design. Including but not limited to:\n\n - Brownfield equipment modifications and upgrades\n\n - Greenfield equipment design\n\n - Evaluation and optimization of operating equipment\n\n - Operations support\n\nStrong I&C fundamentals\n\n - Minimum 7 years direct experience in networking and systems administration for control systems, including\n\n - Network architecture design, procurement, installation, and commissioning\n\n - Experience managing fiber installation\n\n - Expert-level knowledge in Ignition\n\n - Experience managing the plant network and interfacing securely with the business network\n\n - Review of P&IDs in the development of system architecture drawings\n\n - Experience with control system programming\n\nExperience with the following industries and/or production environments:\n\n - Industrial manufacturing\n\n - Large-scale mining or mineral processing\n\n - Large-scale chemical production processes\n\n - Engineering, procurement, and construction firms\n\n - Experience with direct or indirect leadership of engineers and technicians\n\n - Experience with project management and execution of medium to large scale (>$5M) capital projects\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $190K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $190K","compensationTiers":[{"id":"4ca5bd00-8b01-41e0-80d8-10529ca365ba","tierSummary":"$150K – $190K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"1318eae3-9cca-44ca-a642-58c14ed38e61","summary":"$150K – $190K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":190000},{"id":"6cd1edda-3822-455c-90b1-93dfa8117df5","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":190000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"90f988d5-be70-4baf-aadd-988607db5e59","title":"Sr./Staff Technical Program Manager - Copper ","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-09-03T20:59:53.182+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/90f988d5-be70-4baf-aadd-988607db5e59","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/90f988d5-be70-4baf-aadd-988607db5e59/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
We are hiring Technical Program Managers to own the planning, coordination, and execution of capital projects in Mariana’s portfolio, from idea, to development, through construction and handover to operations.
In this role, you are the single owner of a program. Including scope definition, schedule, budget, and risk register. You coordinate between process development, process engineering, detailed engineering, procurement, construction, business development, and finance. You will build and maintain the execution plan, develop the plan to keep the program the moving and communicate progress, surface risks and decisions before they turn into schedule impacts, and drive them to closure. You will run all of this inside Mariana’s Capital Project OS, the software tools that automate and standardize how we plan, track, and execute programs. You will ensure standardization in execution approaches in the program and provide feedback on Capital Project OS to the software and product management teams to continuously improve the tool.
What You’ll Do
Own end-to-end delivery of an assigned capital program—scope, schedule, budget, and risk—from development through construction and handover to operations
Build and maintain the integrated program schedule, tracking critical path, interdependencies, long-lead items, and resource needs
Own the program budget and cost forecast, partnering with project controls and finance on estimates, commitments, variances, and change control
Manage interfaces across process development, process engineering, detailed engineering, procurement, construction, business development, and finance so decisions move quickly and nothing falls between disciplines
Run the program cadence and checkpoints. Execution planning, design reviews, status meetings, and readiness gates
Surface risks and open decisions early, quantify their schedule and cost impact, drive them to closure, and escalate with a recommendations
Produce program reporting and dashboards that give leadership a view of status, critical path, risks, and trade-offs
Manage engineering partners, vendors, and contractors against scope, deliverable schedules, and quality expectations
Run your program inside Mariana’s Capital Project OS, drive consistent adoption across your workstreams, and feed requirements, gaps, and improvement ideas back to the software team
Support construction, commissioning, and startup in the field, and contribute to Mariana’s program-management standards, templates, and metrics as the portfolio grows
Desired Qualifications
Bachelor’s degree in Engineering or a related technical field
4+ years of program or project management experience on capital projects in mining, minerals processing, chemical, energy, or heavy-industrial environments
Demonstrated ownership of an integrated schedule and budget on a project spanning multiple engineering disciplines and external partners
Strong technical fluency—able to read P&IDs, general arrangements, and equipment lists
Excellent written and verbal communication and stakeholder management skills,
Willingness to travel to project sites as programs require
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nWe are hiring Technical Program Managers to own the planning, coordination, and execution of capital projects in Mariana’s portfolio, from idea, to development, through construction and handover to operations.\n\nIn this role, you are the single owner of a program. Including scope definition, schedule, budget, and risk register. You coordinate between process development, process engineering, detailed engineering, procurement, construction, business development, and finance. You will build and maintain the execution plan, develop the plan to keep the program the moving and communicate progress, surface risks and decisions before they turn into schedule impacts, and drive them to closure. You will run all of this inside Mariana’s Capital Project OS, the software tools that automate and standardize how we plan, track, and execute programs. You will ensure standardization in execution approaches in the program and provide feedback on Capital Project OS to the software and product management teams to continuously improve the tool.\n\n\n\nWhat You’ll Do\n\n - Own end-to-end delivery of an assigned capital program—scope, schedule, budget, and risk—from development through construction and handover to operations\n\n - Build and maintain the integrated program schedule, tracking critical path, interdependencies, long-lead items, and resource needs\n\n - Own the program budget and cost forecast, partnering with project controls and finance on estimates, commitments, variances, and change control\n\n - Manage interfaces across process development, process engineering, detailed engineering, procurement, construction, business development, and finance so decisions move quickly and nothing falls between disciplines\n\n - Run the program cadence and checkpoints. Execution planning, design reviews, status meetings, and readiness gates\n\n - Surface risks and open decisions early, quantify their schedule and cost impact, drive them to closure, and escalate with a recommendations\n\n - Produce program reporting and dashboards that give leadership a view of status, critical path, risks, and trade-offs\n\n - Manage engineering partners, vendors, and contractors against scope, deliverable schedules, and quality expectations\n\n - Run your program inside Mariana’s Capital Project OS, drive consistent adoption across your workstreams, and feed requirements, gaps, and improvement ideas back to the software team\n\n - Support construction, commissioning, and startup in the field, and contribute to Mariana’s program-management standards, templates, and metrics as the portfolio grows\n\n\n\nDesired Qualifications\n\n - Bachelor’s degree in Engineering or a related technical field\n\n - 4+ years of program or project management experience on capital projects in mining, minerals processing, chemical, energy, or heavy-industrial environments\n\n - Demonstrated ownership of an integrated schedule and budget on a project spanning multiple engineering disciplines and external partners\n\n - Strong technical fluency—able to read P&IDs, general arrangements, and equipment lists\n\n - Excellent written and verbal communication and stakeholder management skills,\n\n - Willingness to travel to project sites as programs require\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"440cd3f7-9231-46e8-a860-14896bb9abe9","title":"Sr./Staff Technical Program Manager - Lithium ","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-09-04T22:45:01.463+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/440cd3f7-9231-46e8-a860-14896bb9abe9","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/440cd3f7-9231-46e8-a860-14896bb9abe9/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
We are hiring Technical Program Managers to own the planning, coordination, and execution of capital projects in Mariana’s portfolio, from idea, to development, through construction and handover to operations.
In this role, you are the single owner of a program. Including scope definition, schedule, budget, and risk register. You coordinate between process development, process engineering, detailed engineering, procurement, construction, business development, and finance. You will build and maintain the execution plan, develop the plan to keep the program the moving and communicate progress, surface risks and decisions before they turn into schedule impacts, and drive them to closure. You will run all of this inside Mariana’s Capital Project OS, the software tools that automate and standardize how we plan, track, and execute programs. You will ensure standardization in execution approaches in the program and provide feedback on Capital Project OS to the software and product management teams to continuously improve the tool.
What You’ll Do
Own end-to-end delivery of an assigned capital program—scope, schedule, budget, and risk—from development through construction and handover to operations
Build and maintain the integrated program schedule, tracking critical path, interdependencies, long-lead items, and resource needs
Own the program budget and cost forecast, partnering with project controls and finance on estimates, commitments, variances, and change control
Manage interfaces across process development, process engineering, detailed engineering, procurement, construction, business development, and finance so decisions move quickly and nothing falls between disciplines
Run the program cadence and checkpoints. Execution planning, design reviews, status meetings, and readiness gates
Surface risks and open decisions early, quantify their schedule and cost impact, drive them to closure, and escalate with a recommendations
Produce program reporting and dashboards that give leadership a view of status, critical path, risks, and trade-offs
Manage engineering partners, vendors, and contractors against scope, deliverable schedules, and quality expectations
Run your program inside Mariana’s Capital Project OS, drive consistent adoption across your workstreams, and feed requirements, gaps, and improvement ideas back to the software team
Support construction, commissioning, and startup in the field, and contribute to Mariana’s program-management standards, templates, and metrics as the portfolio grows
Desired Qualifications
Bachelor’s degree in Engineering or a related technical field
4+ years of program or project management experience on capital projects in mining, minerals processing, chemical, energy, or heavy-industrial environments
Demonstrated ownership of an integrated schedule and budget on a project spanning multiple engineering disciplines and external partners
Strong technical fluency—able to read P&IDs, general arrangements, and equipment lists
Excellent written and verbal communication and stakeholder management skills,
Willingness to travel to project sites as programs require
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nWe are hiring Technical Program Managers to own the planning, coordination, and execution of capital projects in Mariana’s portfolio, from idea, to development, through construction and handover to operations.\n\nIn this role, you are the single owner of a program. Including scope definition, schedule, budget, and risk register. You coordinate between process development, process engineering, detailed engineering, procurement, construction, business development, and finance. You will build and maintain the execution plan, develop the plan to keep the program the moving and communicate progress, surface risks and decisions before they turn into schedule impacts, and drive them to closure. You will run all of this inside Mariana’s Capital Project OS, the software tools that automate and standardize how we plan, track, and execute programs. You will ensure standardization in execution approaches in the program and provide feedback on Capital Project OS to the software and product management teams to continuously improve the tool.\n\n \n\nWhat You’ll Do\n\n - Own end-to-end delivery of an assigned capital program—scope, schedule, budget, and risk—from development through construction and handover to operations\n\n - Build and maintain the integrated program schedule, tracking critical path, interdependencies, long-lead items, and resource needs\n\n - Own the program budget and cost forecast, partnering with project controls and finance on estimates, commitments, variances, and change control\n\n - Manage interfaces across process development, process engineering, detailed engineering, procurement, construction, business development, and finance so decisions move quickly and nothing falls between disciplines\n\n - Run the program cadence and checkpoints. Execution planning, design reviews, status meetings, and readiness gates\n\n - Surface risks and open decisions early, quantify their schedule and cost impact, drive them to closure, and escalate with a recommendations\n\n - Produce program reporting and dashboards that give leadership a view of status, critical path, risks, and trade-offs\n\n - Manage engineering partners, vendors, and contractors against scope, deliverable schedules, and quality expectations\n\n - Run your program inside Mariana’s Capital Project OS, drive consistent adoption across your workstreams, and feed requirements, gaps, and improvement ideas back to the software team\n\n - Support construction, commissioning, and startup in the field, and contribute to Mariana’s program-management standards, templates, and metrics as the portfolio grows\n\n \n\nDesired Qualifications\n\n - Bachelor’s degree in Engineering or a related technical field\n\n - 4+ years of program or project management experience on capital projects in mining, minerals processing, chemical, energy, or heavy-industrial environments\n\n - Demonstrated ownership of an integrated schedule and budget on a project spanning multiple engineering disciplines and external partners\n\n - Strong technical fluency—able to read P&IDs, general arrangements, and equipment lists\n\n - Excellent written and verbal communication and stakeholder management skills,\n\n - Willingness to travel to project sites as programs require\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $200K","compensationTiers":[{"id":"c0ce5c70-d633-454b-abfb-2aac3a4a6003","tierSummary":"$150K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"dea7d0c5-38b9-4011-bb5d-507fbeb9a127","summary":"$150K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"id":"6f52375e-b8a2-4028-be7e-0052809c059c","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"50d676d2-0ca3-4c3c-9f92-94c53a71e774","title":"Staff Instrumentation and Controls Engineer","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"San Francisco HQ","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}}}],"publishedAt":"2026-09-04T22:44:38.052+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/50d676d2-0ca3-4c3c-9f92-94c53a71e774","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/50d676d2-0ca3-4c3c-9f92-94c53a71e774/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
Mariana Minerals is looking for a highly motivated Instrumentation and Controls Engineer to work on building the critical minerals supply chain.
As the I&C Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide instrument and controls infrastructure scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team.
What You’ll Do
Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp
Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes
Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes
Support the hiring, mentorship, and day-to-day management of junior engineers
Lead selection, procurement, calibration, and installation of instruments, valves, and analyzers
Support development of machine learning applications with an emphasis on control and optimization of industrial facilities
Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms
What You’ll Bring
Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems
Experience with equipment engineering and design. Including but not limited to:
Brownfield equipment modifications and upgrades
Greenfield equipment design
Evaluation and optimization of operating equipment
Operations support
Strong I&C fundamentals
Minimum 7 years direct experience as an instrumentation engineer, including
Measurement technology evaluation, including novel technologies
Instrument specification and procurement
Instrument detailed design and interface with construction teams
Field inspections and QA/QC
Calibration, startup support, troubleshooting
Experience in design, procurement, installation, and operations support of analyzers
Review of P&IDs and development of instrumentation deliverables
Experience with control system programming
Experience with HMI programming
Experience with the following industries and/or production environments:
Industrial manufacturing
Large-scale mining or mineral processing
Large-scale chemical production processes
Engineering, procurement, and construction firms
Experience with direct or indirect leadership of engineers and technicians
Experience with project management and execution of medium to large scale (>$5M) capital projects
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nMariana Minerals is looking for a highly motivated Instrumentation and Controls Engineer to work on building the critical minerals supply chain.\n\nAs the I&C Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide instrument and controls infrastructure scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team.\n\n\n\nWhat You’ll Do\n\n - Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp\n\n - Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes\n\n - Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes\n\n - Support the hiring, mentorship, and day-to-day management of junior engineers\n\n - Lead selection, procurement, calibration, and installation of instruments, valves, and analyzers\n\n - Support development of machine learning applications with an emphasis on control and optimization of industrial facilities\n\n - Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms\n\n\n\nWhat You’ll Bring\n\n - Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems\n\n - Experience with equipment engineering and design. Including but not limited to:\n\n - Brownfield equipment modifications and upgrades\n\n - Greenfield equipment design\n\n - Evaluation and optimization of operating equipment\n\n - Operations support\n \n \n \n Strong I&C fundamentals\n\n - Minimum 7 years direct experience as an instrumentation engineer, including\n\n - Measurement technology evaluation, including novel technologies\n\n - Instrument specification and procurement\n\n - Instrument detailed design and interface with construction teams\n\n - Field inspections and QA/QC\n\n - Calibration, startup support, troubleshooting\n\n - Experience in design, procurement, installation, and operations support of analyzers\n\n - Review of P&IDs and development of instrumentation deliverables\n\n - Experience with control system programming\n\n - Experience with HMI programming\n \n \n \n Experience with the following industries and/or production environments:\n\n - Industrial manufacturing\n\n - Large-scale mining or mineral processing\n\n - Large-scale chemical production processes\n\n - Engineering, procurement, and construction firms\n\n - Experience with direct or indirect leadership of engineers and technicians\n\n - Experience with project management and execution of medium to large scale (>$5M) capital projects\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $190K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $190K","compensationTiers":[{"id":"2badb95a-b8c2-493d-a096-68bdb7e266a7","tierSummary":"$150K – $190K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"0d6be0ed-65fe-48b1-a702-07d4875513a3","summary":"$150K – $190K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":190000},{"id":"752079e1-8caa-44a6-84a7-796cac991886","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":190000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"884a2ced-af82-4c84-8513-eda791d571a6","title":"Maintenance Technician","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"East Texas","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-08T00:14:00.188+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Joaquin"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/884a2ced-af82-4c84-8513-eda791d571a6","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/884a2ced-af82-4c84-8513-eda791d571a6/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Maintenance Technician, Mechanical supports safe, reliable operation of our process and utility equipment at Lithium One in Joaquin, TX. In this role, you will perform preventive and corrective maintenance on pumps, motors, valves, conveyors, blowers, compressors, and other rotating equipment, then respond to unplanned breakdowns and trace problems to the root cause. You will play a critical role in keeping production steady and downtime low, and you will have a real hand in building our maintenance program from the ground up, including finding ways to simplify or automate repetitive maintenance tasks. As a startup, the first 6-8 months will include work beyond your mechanical specialty, such as electrical and instrumentation support, so the ideal fit is someone who loves variety and wants to build something.
Responsibilities
Perform preventive, predictive, and corrective maintenance on pumps, motors, valves, conveyors, blowers, compressors, and other rotating and process equipment
Troubleshoot and diagnose planned and unplanned equipment issues across the Lithium One plant, finding the root cause and making timely repairs
Keep production steady by minimizing downtime and completing work to manufacturer specifications and quality standards
Perform and document accurate inspections, calibration, and lubrication on process and utility equipment, and recommend equipment for inclusion in preventive maintenance programs
Read P&IDs, schematics, and blueprints, requisition parts and materials, and log work, parts used, and equipment condition in our in-house CMMS
Work with operations, engineering, and the electrical and controls techs to support start-up, shutdown, and change-out activities, and communicate potential hazards to engineers, electricians, and operators
Follow all OSHA and company safety procedures (including lockout/tagout, confined space, and traffic rules), actively participate in safety meetings, and immediately report hazards, near misses, or equipment damage while ensuring operations meet environmental and regulatory standards
Qualifications & Experience
Technical or trade school training in industrial maintenance or mechanical technology preferred (or equivalent experience)
Proven industrial maintenance experience, 3+ years
Hands-on experience with piping and with pump, motor, and valve rebuild and repair on rotating and process equipment
Experience in an oil & gas, water treatment, chemical processing, or similar industrial setting (oil & gas highly preferred; hydrometallurgy, mining, or battery materials experience is a plus)
Working knowledge of electrical and basic instrumentation systems, including motor starters and control circuits
Ability to read P&IDs, schematics, blueprints, and equipment manuals
Strong mechanical aptitude, with comfort using hand tools, power tools, precision measuring instruments, and basic rigging
Strong communication across shifts and good computer skills; CMMS experience preferred
Valid driver's license
Schedule
12-hour shifts (6am-6pm): Sunday-Tuesday plus every other Wednesday, or Thursday-Saturday plus every other Wednesday. A night rotation will be added in the near future.
Working Environment & Physical Requirements
Work in the processing plant and shop, in all weather conditions including extreme temperatures, with exposure to chemicals and other hazardous materials
Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods
Ability to climb ladders and structures, with the manual dexterity to use hand and power tools
Must wear and use all required PPE
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Maintenance Technician, Mechanical supports safe, reliable operation of our process and utility equipment at Lithium One in Joaquin, TX. In this role, you will perform preventive and corrective maintenance on pumps, motors, valves, conveyors, blowers, compressors, and other rotating equipment, then respond to unplanned breakdowns and trace problems to the root cause. You will play a critical role in keeping production steady and downtime low, and you will have a real hand in building our maintenance program from the ground up, including finding ways to simplify or automate repetitive maintenance tasks. As a startup, the first 6-8 months will include work beyond your mechanical specialty, such as electrical and instrumentation support, so the ideal fit is someone who loves variety and wants to build something.\n\nResponsibilities\n\n - Perform preventive, predictive, and corrective maintenance on pumps, motors, valves, conveyors, blowers, compressors, and other rotating and process equipment\n\n - Troubleshoot and diagnose planned and unplanned equipment issues across the Lithium One plant, finding the root cause and making timely repairs\n\n - Keep production steady by minimizing downtime and completing work to manufacturer specifications and quality standards\n\n - Perform and document accurate inspections, calibration, and lubrication on process and utility equipment, and recommend equipment for inclusion in preventive maintenance programs\n\n - Read P&IDs, schematics, and blueprints, requisition parts and materials, and log work, parts used, and equipment condition in our in-house CMMS\n\n - Work with operations, engineering, and the electrical and controls techs to support start-up, shutdown, and change-out activities, and communicate potential hazards to engineers, electricians, and operators\n\n - Follow all OSHA and company safety procedures (including lockout/tagout, confined space, and traffic rules), actively participate in safety meetings, and immediately report hazards, near misses, or equipment damage while ensuring operations meet environmental and regulatory standards\n\nQualifications & Experience\n\n - Technical or trade school training in industrial maintenance or mechanical technology preferred (or equivalent experience)\n\n - Proven industrial maintenance experience, 3+ years\n\n - Hands-on experience with piping and with pump, motor, and valve rebuild and repair on rotating and process equipment\n\n - Experience in an oil & gas, water treatment, chemical processing, or similar industrial setting (oil & gas highly preferred; hydrometallurgy, mining, or battery materials experience is a plus)\n\n - Working knowledge of electrical and basic instrumentation systems, including motor starters and control circuits\n\n - Ability to read P&IDs, schematics, blueprints, and equipment manuals\n\n - Strong mechanical aptitude, with comfort using hand tools, power tools, precision measuring instruments, and basic rigging\n\n - Strong communication across shifts and good computer skills; CMMS experience preferred\n\n - Valid driver's license\n\nSchedule\n12-hour shifts (6am-6pm): Sunday-Tuesday plus every other Wednesday, or Thursday-Saturday plus every other Wednesday. A night rotation will be added in the near future.\n\nWorking Environment & Physical Requirements\n\n - Work in the processing plant and shop, in all weather conditions including extreme temperatures, with exposure to chemicals and other hazardous materials\n\n - Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods\n\n - Ability to climb ladders and structures, with the manual dexterity to use hand and power tools\n\n - Must wear and use all required PPE\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"44e4b7c1-53bf-442c-aecf-31edf7920f70","title":"Mobile Maintenance Supervisor","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-09-09T22:51:24.327+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/44e4b7c1-53bf-442c-aecf-31edf7920f70","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/44e4b7c1-53bf-442c-aecf-31edf7920f70/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Mobile Maintenance Supervisor is a hands-on working supervisor responsible for leading a team of maintenance technicians and supporting the safety, reliability, and availability of Mariana’s growing mobile mining fleet. This role combines technical leadership, field troubleshooting, crew development, maintenance planning, and day-to-day operational decision-making.
The ideal candidate will have a demonstrated track record of hands-on maintenance leadership, strong technical credibility, and a proactive, solutions-oriented approach to working in an evolving operation. They will enjoy solving problems in the field, developing technicians, improving processes, and helping build the systems, practices, and crew culture needed to support a growing fleet.
Responsibilities:
Lead, supervise, and develop a team of maintenance technicians while maintaining a safety-first mentality and a strong culture of accountability, teamwork, and continuous improvement.
Conduct safety meetings and workplace inspections, address hazards, and ensure work is performed in accordance with company policies and applicable safety requirements.
Work hands-on alongside technicians to troubleshoot, diagnose, and repair heavy mobile mining equipment, including mechanical, hydraulic, and electrical systems.
Prioritize and coordinate daily maintenance activities based on safety, equipment criticality, production needs, labor, parts, and available resources.
Perform advanced troubleshooting and failure analysis using diagnostic tools, schematics, technical manuals, and equipment documentation.
Drive equipment reliability and availability through preventative maintenance, repair-quality review, equipment-status tracking, and identification of recurring failures.
Coordinate with planners, operations, and vendors to schedule repairs, manage work orders, source parts, and communicate repair requirements and expected downtime.
Train and mentor technicians, provide technical leadership in the field, and provide on-call support as needed, including serving as the senior maintenance representative when leadership may not be onsite.
Required Qualifications:
Previous supervisory, lead technician, or crew-leadership experience, with the ability to coach technicians and provide technical direction in the field.
Minimum of 5 years of mining maintenance experience, with strong hands-on experience supporting heavy mobile mining equipment.
Strong troubleshooting and failure-analysis skills across mechanical, hydraulic, and electrical systems, including the ability to read hydraulic and electrical schematics; welding experience is a plus.
Experience with Caterpillar mobile mining equipment and electronic diagnostic tools; familiarity with CAT ET, CAT SIS, and direct experience with CAT 777 haul trucks and/or CAT 992K wheel loaders is strongly preferred.
Strong communication, organization, and problem-solving skills, with the ability to make decisions, take ownership, and work effectively in a growing operation where processes and systems are still being developed.
Experience using maintenance tracking systems and Microsoft Office applications.
Experience with autonomous mining technology is a plus.
Valid driver’s license required.
Working Environment and Schedule:
Schedule: 7 days on / 7 days off, working 12-hour shifts. As operations expand, supervisors will rotate between day and night shifts and must be available for on-call coverage as needed.
Work Environment: Approximately 70% fieldwork and 30% office-based work.
Housing & Relocation: Housing and relocation assistance options are available
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Mobile Maintenance Supervisor is a hands-on working supervisor responsible for leading a team of maintenance technicians and supporting the safety, reliability, and availability of Mariana’s growing mobile mining fleet. This role combines technical leadership, field troubleshooting, crew development, maintenance planning, and day-to-day operational decision-making.\n\nThe ideal candidate will have a demonstrated track record of hands-on maintenance leadership, strong technical credibility, and a proactive, solutions-oriented approach to working in an evolving operation. They will enjoy solving problems in the field, developing technicians, improving processes, and helping build the systems, practices, and crew culture needed to support a growing fleet.\n\nResponsibilities:\n\n - Lead, supervise, and develop a team of maintenance technicians while maintaining a safety-first mentality and a strong culture of accountability, teamwork, and continuous improvement.\n\n - Conduct safety meetings and workplace inspections, address hazards, and ensure work is performed in accordance with company policies and applicable safety requirements.\n\n - Work hands-on alongside technicians to troubleshoot, diagnose, and repair heavy mobile mining equipment, including mechanical, hydraulic, and electrical systems.\n\n - Prioritize and coordinate daily maintenance activities based on safety, equipment criticality, production needs, labor, parts, and available resources.\n\n - Perform advanced troubleshooting and failure analysis using diagnostic tools, schematics, technical manuals, and equipment documentation.\n\n - Drive equipment reliability and availability through preventative maintenance, repair-quality review, equipment-status tracking, and identification of recurring failures.\n\n - Coordinate with planners, operations, and vendors to schedule repairs, manage work orders, source parts, and communicate repair requirements and expected downtime.\n\n - Train and mentor technicians, provide technical leadership in the field, and provide on-call support as needed, including serving as the senior maintenance representative when leadership may not be onsite.\n\nRequired Qualifications:\n\n - Previous supervisory, lead technician, or crew-leadership experience, with the ability to coach technicians and provide technical direction in the field.\n\n - Minimum of 5 years of mining maintenance experience, with strong hands-on experience supporting heavy mobile mining equipment.\n\n - Strong troubleshooting and failure-analysis skills across mechanical, hydraulic, and electrical systems, including the ability to read hydraulic and electrical schematics; welding experience is a plus.\n\n - Experience with Caterpillar mobile mining equipment and electronic diagnostic tools; familiarity with CAT ET, CAT SIS, and direct experience with CAT 777 haul trucks and/or CAT 992K wheel loaders is strongly preferred.\n\n - Strong communication, organization, and problem-solving skills, with the ability to make decisions, take ownership, and work effectively in a growing operation where processes and systems are still being developed.\n\n - Experience using maintenance tracking systems and Microsoft Office applications.\n\n - Experience with autonomous mining technology is a plus.\n\n - Valid driver’s license required.\n\nWorking Environment and Schedule: \n\n - Schedule: 7 days on / 7 days off, working 12-hour shifts. As operations expand, supervisors will rotate between day and night shifts and must be available for on-call coverage as needed.\n\n - Work Environment: Approximately 70% fieldwork and 30% office-based work.\n\n - Housing & Relocation: Housing and relocation assistance options are available\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"15a2ddc3-c9c1-4d00-abd8-790a2151e8b2","title":"R&D Metallurgist ","department":"Process Development","team":"Process Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-09-10T16:35:12.523+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/15a2ddc3-c9c1-4d00-abd8-790a2151e8b2","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/15a2ddc3-c9c1-4d00-abd8-790a2151e8b2/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
The R&D Metallurgist designs, executes, and analyzes experiments to advance Mariana Minerals' hydrometallurgical testing programs. This hands-on laboratory and pilot-scale role focuses on running DOE protocols, operating tank reactors and mining systems, and analyzing data to optimize extraction for critical minerals.
What You'll Do
Develop Design of Experiments (DOE) protocols for chemical processing, extraction, and purification
Analyze metallurgical and process data to identify trends, root causes, and optimization opportunities
Operate tank reactors, filtration systems, separation equipment, and purification units at bench and pilot scale
Prepare chemical solutions and reagents according to experimental specifications
Monitor and control process parameters: temperature, pH, flow rates, residence time, and reagent dosing
Perform systematic sampling and material handling throughout process streams
Collect experimental data including process parameters, weights, volumes, and analytical results
Analyze data using Excel and statistical tools to evaluate performance and identify optimization opportunities
Generate clear data visualizations, charts, and summary reports
Maintain detailed laboratory notebooks and digital documentation
Support DOE planning and multi-variable optimization studies
Perform routine maintenance, calibration, and troubleshooting of processing equipment
Follow all chemical handling, PPE, and MSHA/OSHA safety protocols
Maintain clean, organized, and safe laboratory environments
Conduct hazard assessments for chemical processes and experimental setups
Desired Qualifications
Bachelor's degree in Chemistry, Chemical Engineering, Metallurgy, or related technical field preferred
5+ years' experience in chemical processing, hydrometallurgy, or laboratory/pilot plant operations
Experience with Design of Experiments (DOE) methodology and statistical analysis highly desirable
Hands-on experience with chemical reactors, filtration, and separation equipment
Advanced Excel proficiency (pivot tables, statistical functions, data visualization)
Understanding of chemical process fundamentals (mass balance, stoichiometry, reaction kinetics)
Knowledge of purification techniques (precipitation, solvent extraction, ion exchange, crystallization)
Ability to read P&IDs and process flow diagrams
Experience with DOE software (JMP, Minitab, Design-Expert) is a plus
Exceptional attention to detail and data integrity
Strong analytical and problem-solving skills
Excellent communication and documentation abilities
Self-motivated with ability to manage multiple experiments
Unwavering commitment to safety and quality
Valid driver's license required
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\n - The R&D Metallurgist designs, executes, and analyzes experiments to advance Mariana Minerals' hydrometallurgical testing programs. This hands-on laboratory and pilot-scale role focuses on running DOE protocols, operating tank reactors and mining systems, and analyzing data to optimize extraction for critical minerals.\n\nWhat You'll Do\n\n - Develop Design of Experiments (DOE) protocols for chemical processing, extraction, and purification\n\n - Analyze metallurgical and process data to identify trends, root causes, and optimization opportunities\n\n - Operate tank reactors, filtration systems, separation equipment, and purification units at bench and pilot scale\n\n - Prepare chemical solutions and reagents according to experimental specifications\n\n - Monitor and control process parameters: temperature, pH, flow rates, residence time, and reagent dosing\n\n - Perform systematic sampling and material handling throughout process streams\n\n - Collect experimental data including process parameters, weights, volumes, and analytical results\n\n - Analyze data using Excel and statistical tools to evaluate performance and identify optimization opportunities\n\n - Generate clear data visualizations, charts, and summary reports\n\n - Maintain detailed laboratory notebooks and digital documentation\n\n - Support DOE planning and multi-variable optimization studies\n\n - Perform routine maintenance, calibration, and troubleshooting of processing equipment\n\n - Follow all chemical handling, PPE, and MSHA/OSHA safety protocols\n\n - Maintain clean, organized, and safe laboratory environments\n\n - Conduct hazard assessments for chemical processes and experimental setups\n\nDesired Qualifications\n\n - Bachelor's degree in Chemistry, Chemical Engineering, Metallurgy, or related technical field preferred\n\n - 5+ years' experience in chemical processing, hydrometallurgy, or laboratory/pilot plant operations\n\n - Experience with Design of Experiments (DOE) methodology and statistical analysis highly desirable\n\n - Hands-on experience with chemical reactors, filtration, and separation equipment\n\n - Advanced Excel proficiency (pivot tables, statistical functions, data visualization)\n\n - Understanding of chemical process fundamentals (mass balance, stoichiometry, reaction kinetics)\n\n - Knowledge of purification techniques (precipitation, solvent extraction, ion exchange, crystallization)\n\n - Ability to read P&IDs and process flow diagrams\n\n - Experience with DOE software (JMP, Minitab, Design-Expert) is a plus\n\n - Exceptional attention to detail and data integrity\n\n - Strong analytical and problem-solving skills\n\n - Excellent communication and documentation abilities\n\n - Self-motivated with ability to manage multiple experiments\n\n - Unwavering commitment to safety and quality\n\n - Valid driver's license required\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$110K – $140K • Offers Equity","scrapeableCompensationSalarySummary":"$110K - $140K","compensationTiers":[{"id":"e3e32e6b-1229-41cc-ac17-9d6d68b1039e","tierSummary":"$110K – $140K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"b14ec970-ee72-414d-9e9e-80dafcd3dd1d","summary":"$110K – $140K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":110000,"maxValue":140000},{"id":"037817f9-ea6f-46f6-a546-f3f29a530581","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":110000,"maxValue":140000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"bb2422eb-f76b-4f6d-8cf3-8589cfd1b80c","title":"Vice President of Finance ","department":"Finance","team":"Finance","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-09-14T15:41:34.158+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/bb2422eb-f76b-4f6d-8cf3-8589cfd1b80c","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/bb2422eb-f76b-4f6d-8cf3-8589cfd1b80c/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
We are seeking an experienced Vice President of Finance to lead and scale Mariana Minerals' existing Accounting and FP&A team as we grow from two capital-intensive flagship projects today toward a broader portfolio of commercial mining and mineral-processing operations. Reporting to the Co-Founder & Chief Financial Officer, this role owns the finance organization's execution end to end — technical accounting, close, audit, and controls on one side; budgeting, forecasting, and cross-functional business partnering on the other.
The ideal candidate combines deep technical accounting expertise with strong strategic and people leadership, and has scaled a finance function before at a capital-intensive, high-growth company. As Mariana continues to grow, this role will play a key part in strengthening internal controls, building financial infrastructure, and preparing the company for its next stage of growth.
This role will work closely with the CEO, CFO, project leadership, and the board, and will lead Mariana's existing Accounting and FP&A staff across multiple operating locations.
What You'll Do
FP&A & Strategic Finance
Lead company-wide budgeting, forecasting, and long-range planning across corporate and project-level P&Ls – particularly in the form of development and management of Mariana’s internally-developed FP&A tools and BizOs software platform.
Partner directly with the CEO, CFO, and project leadership on capital allocation, unit economics, and project-level financial modeling for Lithium One, Copper One, and future sites.
Own board and investor reporting, including monthly and quarterly board packages, investor updates, and ad hoc requests from Mariana's investor base.
Build the financial infrastructure, reporting cadence, and KPIs needed to support Mariana's plan to stand up ten commercial projects over the next decade.
Accounting & Controllership
In conjunction with Mariana’s Controller, own the monthly, quarterly, and annual close process, ensuring accurate, timely, and audit-ready financials across all entities and projects.
Serve as the primary point of contact for external auditors and tax advisors; manage the annual audit process end to end.
Set and maintain technical accounting policy, including capitalized project costs, inventory and commodity accounting, revenue recognition, and foreign currency, as operations scale.
Build and strengthen internal controls and financial systems in anticipation of future capital raises and eventual public-company readiness.
Oversee treasury and cash management across a balance sheet funded by venture capital and project-level capital structures.
Team & Systems Leadership
Lead, coach, and develop Mariana's existing Accounting and FP&A team as headcount and project count scale.
Evaluate and implement finance systems and tooling, including ERP and planning tools, to replace manual processes as transaction volume and complexity increase.
Represent finance in cross-functional planning with Engineering, Operations, Legal, and Talent as Mariana scales its corporate functions.
Identify opportunities to improve financial processes, reporting, and automation across the finance organization.
Desired Qualifications
10+ years of progressive finance and accounting experience, including senior leadership spanning both accounting/controllership and FP&A.
A track record of scaling a finance function at a capital-intensive, high-growth company, such as hardware, industrials, energy, or mining, ideally through a period of significant fundraising or capital deployment.
Strong understanding of GAAP and core accounting principles; CPA or equivalent technical accounting credential strongly preferred.
Direct experience owning external audit relationships and board or investor reporting.
Experience building or upgrading financial systems and processes as a company scales.
Experience with ERP or accounting systems and financial planning tools.
Background in natural resources, energy, infrastructure, or other capital-intensive businesses is a plus.
Experience partnering with government or regulated-industry stakeholders is a plus.
Strong communication and interpersonal skills, with the ability to work cross-functionally and manage competing priorities in a fast-paced environment.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nWe are seeking an experienced Vice President of Finance to lead and scale Mariana Minerals' existing Accounting and FP&A team as we grow from two capital-intensive flagship projects today toward a broader portfolio of commercial mining and mineral-processing operations. Reporting to the Co-Founder & Chief Financial Officer, this role owns the finance organization's execution end to end — technical accounting, close, audit, and controls on one side; budgeting, forecasting, and cross-functional business partnering on the other.\n\nThe ideal candidate combines deep technical accounting expertise with strong strategic and people leadership, and has scaled a finance function before at a capital-intensive, high-growth company. As Mariana continues to grow, this role will play a key part in strengthening internal controls, building financial infrastructure, and preparing the company for its next stage of growth.\n\nThis role will work closely with the CEO, CFO, project leadership, and the board, and will lead Mariana's existing Accounting and FP&A staff across multiple operating locations.\n\n\n\nWhat You'll Do\n\nFP&A & Strategic Finance\n\n - Lead company-wide budgeting, forecasting, and long-range planning across corporate and project-level P&Ls – particularly in the form of development and management of Mariana’s internally-developed FP&A tools and BizOs software platform.\n\n - Partner directly with the CEO, CFO, and project leadership on capital allocation, unit economics, and project-level financial modeling for Lithium One, Copper One, and future sites.\n\n - Own board and investor reporting, including monthly and quarterly board packages, investor updates, and ad hoc requests from Mariana's investor base.\n\n - Build the financial infrastructure, reporting cadence, and KPIs needed to support Mariana's plan to stand up ten commercial projects over the next decade.\n\nAccounting & Controllership\n\n - In conjunction with Mariana’s Controller, own the monthly, quarterly, and annual close process, ensuring accurate, timely, and audit-ready financials across all entities and projects.\n\n - Serve as the primary point of contact for external auditors and tax advisors; manage the annual audit process end to end.\n\n - Set and maintain technical accounting policy, including capitalized project costs, inventory and commodity accounting, revenue recognition, and foreign currency, as operations scale.\n\n - Build and strengthen internal controls and financial systems in anticipation of future capital raises and eventual public-company readiness.\n\n - Oversee treasury and cash management across a balance sheet funded by venture capital and project-level capital structures.\n\nTeam & Systems Leadership\n\n - Lead, coach, and develop Mariana's existing Accounting and FP&A team as headcount and project count scale.\n\n - Evaluate and implement finance systems and tooling, including ERP and planning tools, to replace manual processes as transaction volume and complexity increase.\n\n - Represent finance in cross-functional planning with Engineering, Operations, Legal, and Talent as Mariana scales its corporate functions.\n\n - Identify opportunities to improve financial processes, reporting, and automation across the finance organization.\n\n\n\nDesired Qualifications\n\n - 10+ years of progressive finance and accounting experience, including senior leadership spanning both accounting/controllership and FP&A.\n\n - A track record of scaling a finance function at a capital-intensive, high-growth company, such as hardware, industrials, energy, or mining, ideally through a period of significant fundraising or capital deployment.\n\n - Strong understanding of GAAP and core accounting principles; CPA or equivalent technical accounting credential strongly preferred.\n\n - Direct experience owning external audit relationships and board or investor reporting.\n\n - Experience building or upgrading financial systems and processes as a company scales.\n\n - Experience with ERP or accounting systems and financial planning tools.\n\n - Background in natural resources, energy, infrastructure, or other capital-intensive businesses is a plus.\n\n - Experience partnering with government or regulated-industry stakeholders is a plus.\n\n - Strong communication and interpersonal skills, with the ability to work cross-functionally and manage competing priorities in a fast-paced environment.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"a49c4b26-168a-4b9e-9bc2-da8625f8af3c","title":"Custodian/General Labor","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-09-15T16:11:34.570+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/a49c4b26-168a-4b9e-9bc2-da8625f8af3c","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/a49c4b26-168a-4b9e-9bc2-da8625f8af3c/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Job Summary:
We are seeking a dependable and self-motivated Custodian / General Laborer to support the cleanliness, maintenance, and overall functionality of all site buildings and grounds. This role is essential to creating and maintaining safe, organized, and professional workspaces across the operation. The ideal candidate will take pride in their work, demonstrate strong organizational skills, and be flexible in supporting a variety of labor needs across departments.
Key Responsibilities:
1. Facility Cleaning & Upkeep
Perform daily and scheduled deep cleaning of all site buildings, including offices, restrooms, break areas, and common spaces.
Maintain cleanliness standards through sweeping, mopping, dusting, trash removal, and sanitization.
Monitor and restock cleaning supplies and facility consumables.
Identify and report maintenance needs or safety hazards promptly.
2. Grounds Maintenance & Landscaping
Conduct routine landscaping tasks including weed control and snow removal as needed.
Maintain outdoor areas to ensure a clean, safe, and professional appearance.
Operate landscaping tools and equipment safely and efficiently.
3. General Labor Support
Assist with leach pad labor, EW harvest activities, and maintenance shop organization.
Clean up around the Process Plant and other work areas to maintain a safe environment.
Support other departments with general labor tasks as needed.
Follow instructions from supervisors and collaborate with team members to complete tasks safely and efficiently.
4. Ownership & Safety
Take ownership of assigned areas and responsibilities, ensuring high standards of cleanliness and order.
Demonstrate initiative in identifying and addressing areas needing attention.
Follow all site safety protocols and contribute to a culture of safety and accountability.
Required Skills & Experience:
High school diploma or equivalent preferred.
Ability to work independently and manage time effectively.
Strong attention to detail and pride in maintaining clean, organized spaces.
Basic knowledge of cleaning products, tools, and safety procedures.
Ability to lift up to 50 lbs and perform physical labor in various weather conditions.
Valid driver’s license.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nJob Summary:\nWe are seeking a dependable and self-motivated Custodian / General Laborer to support the cleanliness, maintenance, and overall functionality of all site buildings and grounds. This role is essential to creating and maintaining safe, organized, and professional workspaces across the operation. The ideal candidate will take pride in their work, demonstrate strong organizational skills, and be flexible in supporting a variety of labor needs across departments.\n\n \n\nKey Responsibilities:\n\n1. Facility Cleaning & Upkeep\n\n - Perform daily and scheduled deep cleaning of all site buildings, including offices, restrooms, break areas, and common spaces.\n\n - Maintain cleanliness standards through sweeping, mopping, dusting, trash removal, and sanitization.\n\n - Monitor and restock cleaning supplies and facility consumables.\n\n - Identify and report maintenance needs or safety hazards promptly.\n\n2. Grounds Maintenance & Landscaping\n\n - Conduct routine landscaping tasks including weed control and snow removal as needed.\n\n - Maintain outdoor areas to ensure a clean, safe, and professional appearance.\n\n - Operate landscaping tools and equipment safely and efficiently.\n\n3. General Labor Support\n\n - Assist with leach pad labor, EW harvest activities, and maintenance shop organization.\n\n - Clean up around the Process Plant and other work areas to maintain a safe environment.\n\n - Support other departments with general labor tasks as needed.\n\n - Follow instructions from supervisors and collaborate with team members to complete tasks safely and efficiently.\n\n4. Ownership & Safety\n\n - Take ownership of assigned areas and responsibilities, ensuring high standards of cleanliness and order.\n\n - Demonstrate initiative in identifying and addressing areas needing attention.\n\n - Follow all site safety protocols and contribute to a culture of safety and accountability.\n\n \n\nRequired Skills & Experience:\n\n - High school diploma or equivalent preferred.\n\n - Ability to work independently and manage time effectively.\n\n - Strong attention to detail and pride in maintaining clean, organized spaces.\n\n - Basic knowledge of cleaning products, tools, and safety procedures.\n\n - Ability to lift up to 50 lbs and perform physical labor in various weather conditions.\n\n - Valid driver’s license.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"4e4e081d-fdde-4269-90fd-c66d34ea7078","title":"Business Operations Manager ","department":"Business Operations","team":"Business Operations","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-09-22T22:46:53.138+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/4e4e081d-fdde-4269-90fd-c66d34ea7078","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/4e4e081d-fdde-4269-90fd-c66d34ea7078/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is looking for a Business Operations Manager to lead operational strategy and business performance management for its Lithium business, based out of Mariana's Houston or San Francisco office. This role sits at the intersection of Finance, Business Development and Operations — translating operational performance into financial insight and helping leadership make faster, better-informed decisions.
What You’ll Do
Financial and Operational performance management: Own the business performance framework for the Lithium business — integrating operational KPIs with financial metrics to give leadership a clear view of cost, production, and margin performance against plan.
FP&A partnership: Work closely with the Finance team to support budgeting, forecasting, and variance analysis. Build the operational context behind the numbers and help translate field data into finance-ready reporting.
Greenfield project development operations: Partner with the Business Development team to build the processes, playbooks, and tracking systems that govern how projects advance from origination through definitive feasibility study (DFS) and into construction.
Business process improvement: Identify and drive improvements across operational and corporate functions, including finance, supply chain, and HSE. Design scalable processes that support growth without adding unnecessary overhead. Lead the company's ISO 9001 certification effort.
Digitization and reporting infrastructure: Partner with Mariana's software and data teams to build and improve the reporting systems and digital tools that support operations. Ensure data flows cleanly from the field to the boardroom.
Executive reporting and communications: Own the cadence of leadership reporting, ensuring leadership always has the information they need, when they need it.
Qualifications
5-10+ years in business operations or program management; experience in energy, chemicals, manufacturing, or another industrial sector is a plus
Demonstrated ability to build and own operational reporting systems (define KPIs, design dashboards, implement data collection workflows)
Experience implementing or maintaining a quality management system; familiarity with ISO 9001 or similar frameworks preferred.
Able to build operational structure around the technical and commercial work of others
Strong communicator with experience distilling complex operational issues into clear updates for leadership and keeping distributed teams aligned
Proven track record leading cross-functional projects in fast-moving environments with minimal oversight
Experience working directly with frontline operations and executive leadership; comfortable influencing without authority across all levels
Comfortable on-site in an industrial environment; this is a full-time, in-person role in Houston, TX
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nMariana Minerals is looking for a Business Operations Manager to lead operational strategy and business performance management for its Lithium business, based out of Mariana's Houston or San Francisco office. This role sits at the intersection of Finance, Business Development and Operations — translating operational performance into financial insight and helping leadership make faster, better-informed decisions.\n\nWhat You’ll Do\n\n - Financial and Operational performance management: Own the business performance framework for the Lithium business — integrating operational KPIs with financial metrics to give leadership a clear view of cost, production, and margin performance against plan.\n\n - FP&A partnership: Work closely with the Finance team to support budgeting, forecasting, and variance analysis. Build the operational context behind the numbers and help translate field data into finance-ready reporting.\n\n - Greenfield project development operations: Partner with the Business Development team to build the processes, playbooks, and tracking systems that govern how projects advance from origination through definitive feasibility study (DFS) and into construction.\n\n - Business process improvement: Identify and drive improvements across operational and corporate functions, including finance, supply chain, and HSE. Design scalable processes that support growth without adding unnecessary overhead. Lead the company's ISO 9001 certification effort.\n\n - Digitization and reporting infrastructure: Partner with Mariana's software and data teams to build and improve the reporting systems and digital tools that support operations. Ensure data flows cleanly from the field to the boardroom.\n\n - Executive reporting and communications: Own the cadence of leadership reporting, ensuring leadership always has the information they need, when they need it.\n\nQualifications\n\n - 5-10+ years in business operations or program management; experience in energy, chemicals, manufacturing, or another industrial sector is a plus\n\n - Demonstrated ability to build and own operational reporting systems (define KPIs, design dashboards, implement data collection workflows)\n\n - Experience implementing or maintaining a quality management system; familiarity with ISO 9001 or similar frameworks preferred.\n\n - Able to build operational structure around the technical and commercial work of others\n\n - Strong communicator with experience distilling complex operational issues into clear updates for leadership and keeping distributed teams aligned\n\n - Proven track record leading cross-functional projects in fast-moving environments with minimal oversight\n\n - Experience working directly with frontline operations and executive leadership; comfortable influencing without authority across all levels\n\n - Comfortable on-site in an industrial environment; this is a full-time, in-person role in Houston, TX\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"a0c8d9b8-371b-4982-bbcc-c3e6550c3633","title":"Sr. Regional Permitting and Compliance Environmental Engineer","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Moab, UT","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}}}],"publishedAt":"2026-10-06T19:23:09.793+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/a0c8d9b8-371b-4982-bbcc-c3e6550c3633","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/a0c8d9b8-371b-4982-bbcc-c3e6550c3633/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is hiring a Sr. Regional Permitting and Compliance Environmental Engineer to own permitting execution and compliance implementation across our U.S. mining, processing, and refining project sites. Reporting to the Global Environmental Permitting Lead, you will manage the full permitting and compliance lifecycle for assigned projects — from early project definition (FEL 1–3) through detailed design, construction, commissioning, and ongoing operations — serving as a primary point of contact with federal, state, and local agencies.
In the near term, this is a global, portfolio-wide function: you will carry permitting and compliance responsibility across Mariana's full U.S. project portfolio rather than a single fixed territory. As the portfolio expands, the role is expected to transition into ownership of a defined region, with additional hires added to cover other regions over time — so this position is a foundational build for what will become the regional structure. This role requires deep, hands-on familiarity with the U.S. multijurisdictional environmental regulatory framework — local, state, and federal — and the credibility to manage agency relationships independently across multiple concurrent projects and jurisdictions today. You will also lead environmental due diligence, contribute to sustainability initiatives, and serve as a key point of contact for internal stakeholders (process engineering, operations, legal, and executive leadership) and external stakeholders (regulatory agencies and consultants).
Permitting Leadership (Global Today, Regional as the Portfolio Scales)
Own and execute permitting roadmaps across federal, state, and local agencies for all project sites in Mariana's current U.S. portfolio, with scope expected to narrow to a defined region as the portfolio and team grow.
Manage NEPA EA/EIS workstreams in coordination with BLM and third-party consultants — from scoping and public comment through Record of Decision (ROD) — ensuring mitigation, monitoring, and reporting commitments flow into design and construction plans.
Integrate permitting requirements into FEL 1–3 and detailed design, working directly with engineering teams to keep environmental commitments on schedule and budget.
Serve as primary point of contact with federal agencies (BLM, USACE, EPA, USFWS) and state/local agencies (e.g., RRC, DNR/MPCA, DEQ, UDEQ/DOGM, CalEPA, and county/municipal authorities) across assigned projects.
Compliance Implementation
Implement and audit Environmental Management Systems (EMS) at project sites across the portfolio, ensuring permit and ROD conditions are embedded in daily operations and management of change (MOC).
Manage ongoing compliance obligations for air, water, stormwater, waste, and EPCRA across assigned sites, tracking deadlines across overlapping federal, state, and local requirements.
Direct environmental monitoring programs and ensure timely submission of quarterly and annual compliance reports to agencies.
Oversee remediation plans and corrective actions for environmental impacts across the portfolio.
Due Diligence & Sustainability Support
Lead environmental due diligence for acquisitions, divestitures, and new project development across the portfolio, assessing permitting/compliance status, risk, and regulatory exposure.
Contribute permitting and compliance data to corporate sustainability and ESG reporting.
Identify and implement continuous-improvement opportunities in permitting and compliance performance, and help define regional structures, staffing, and handoff plans as the portfolio scales.
Stakeholder Engagement
Act as a primary interface between project and site teams and internal stakeholders — process engineering, operations, legal, and executive leadership.
Engage external stakeholders, including regulatory agencies and consultants, to maintain productive relationships and keep permitting and compliance on track.
Prepare concise updates for the Global Environmental Permitting Lead and senior leadership on portfolio-wide permitting and compliance status.
Bachelor's or master's degree in Environmental Engineering, Civil/Environmental Engineering, Environmental Science, Geology, or a related field.
7+ years of U.S. environmental permitting and compliance experience in mining, energy, or large infrastructure, with demonstrated ownership of agency relationships across multiple concurrent projects.
Demonstrated familiarity with the multijurisdictional U.S. environmental regulatory framework — local, state, and federal — and the ability to navigate overlapping requirements across agencies.
Direct experience managing NEPA EA/EIS processes, including coordination with BLM and multi-disciplinary consultant teams, through Record of Decision.
Working knowledge of CAA, CWA, RCRA, ESA, EPCRA, and state/local permitting and compliance programs.
Experience integrating permitting requirements into FEL 1–3 and detailed design, and implementing or auditing Environmental Management Systems (EMS).
Strong technical writing, agency negotiation, and stakeholder-management skills.
Comfort operating in a broad, portfolio-wide role today, with the flexibility and interest to shift into ownership of a defined region as Mariana's project portfolio grows.
Preferred Qualifications
Experience with critical minerals (lithium, nickel, graphite, etc.) or refining/processing facilities.
Experience leading environmental due diligence for M&A or project development.
Familiarity with IFC/Equator Principles or corporate sustainability/ESG reporting frameworks.
Professional certifications such as PE, PG, or CEP.
Prior experience helping stand up or scale a permitting/compliance function as an organization grew.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is hiring a Sr. Regional Permitting and Compliance Environmental Engineer to own permitting execution and compliance implementation across our U.S. mining, processing, and refining project sites. Reporting to the Global Environmental Permitting Lead, you will manage the full permitting and compliance lifecycle for assigned projects — from early project definition (FEL 1–3) through detailed design, construction, commissioning, and ongoing operations — serving as a primary point of contact with federal, state, and local agencies.\n\nIn the near term, this is a global, portfolio-wide function: you will carry permitting and compliance responsibility across Mariana's full U.S. project portfolio rather than a single fixed territory. As the portfolio expands, the role is expected to transition into ownership of a defined region, with additional hires added to cover other regions over time — so this position is a foundational build for what will become the regional structure. This role requires deep, hands-on familiarity with the U.S. multijurisdictional environmental regulatory framework — local, state, and federal — and the credibility to manage agency relationships independently across multiple concurrent projects and jurisdictions today. You will also lead environmental due diligence, contribute to sustainability initiatives, and serve as a key point of contact for internal stakeholders (process engineering, operations, legal, and executive leadership) and external stakeholders (regulatory agencies and consultants).\n\n \n\n\nWHAT YOU'LL DO\n\nPermitting Leadership (Global Today, Regional as the Portfolio Scales)\n\n - Own and execute permitting roadmaps across federal, state, and local agencies for all project sites in Mariana's current U.S. portfolio, with scope expected to narrow to a defined region as the portfolio and team grow.\n\n - Manage NEPA EA/EIS workstreams in coordination with BLM and third-party consultants — from scoping and public comment through Record of Decision (ROD) — ensuring mitigation, monitoring, and reporting commitments flow into design and construction plans.\n\n - Integrate permitting requirements into FEL 1–3 and detailed design, working directly with engineering teams to keep environmental commitments on schedule and budget.\n\n - Serve as primary point of contact with federal agencies (BLM, USACE, EPA, USFWS) and state/local agencies (e.g., RRC, DNR/MPCA, DEQ, UDEQ/DOGM, CalEPA, and county/municipal authorities) across assigned projects.\n\nCompliance Implementation\n\n - Implement and audit Environmental Management Systems (EMS) at project sites across the portfolio, ensuring permit and ROD conditions are embedded in daily operations and management of change (MOC).\n\n - Manage ongoing compliance obligations for air, water, stormwater, waste, and EPCRA across assigned sites, tracking deadlines across overlapping federal, state, and local requirements.\n\n - Direct environmental monitoring programs and ensure timely submission of quarterly and annual compliance reports to agencies.\n\n - Oversee remediation plans and corrective actions for environmental impacts across the portfolio.\n\nDue Diligence & Sustainability Support\n\n - Lead environmental due diligence for acquisitions, divestitures, and new project development across the portfolio, assessing permitting/compliance status, risk, and regulatory exposure.\n\n - Contribute permitting and compliance data to corporate sustainability and ESG reporting.\n\n - Identify and implement continuous-improvement opportunities in permitting and compliance performance, and help define regional structures, staffing, and handoff plans as the portfolio scales.\n\nStakeholder Engagement\n\n - Act as a primary interface between project and site teams and internal stakeholders — process engineering, operations, legal, and executive leadership.\n\n - Engage external stakeholders, including regulatory agencies and consultants, to maintain productive relationships and keep permitting and compliance on track.\n\n - Prepare concise updates for the Global Environmental Permitting Lead and senior leadership on portfolio-wide permitting and compliance status.\n\n \n\n\nQUALIFICATIONS\n\n - Bachelor's or master's degree in Environmental Engineering, Civil/Environmental Engineering, Environmental Science, Geology, or a related field.\n\n - 7+ years of U.S. environmental permitting and compliance experience in mining, energy, or large infrastructure, with demonstrated ownership of agency relationships across multiple concurrent projects.\n\n - Demonstrated familiarity with the multijurisdictional U.S. environmental regulatory framework — local, state, and federal — and the ability to navigate overlapping requirements across agencies.\n\n - Direct experience managing NEPA EA/EIS processes, including coordination with BLM and multi-disciplinary consultant teams, through Record of Decision.\n\n - Working knowledge of CAA, CWA, RCRA, ESA, EPCRA, and state/local permitting and compliance programs.\n\n - Experience integrating permitting requirements into FEL 1–3 and detailed design, and implementing or auditing Environmental Management Systems (EMS).\n\n - Strong technical writing, agency negotiation, and stakeholder-management skills.\n\n - Comfort operating in a broad, portfolio-wide role today, with the flexibility and interest to shift into ownership of a defined region as Mariana's project portfolio grows.\n\nPreferred Qualifications\n\n - Experience with critical minerals (lithium, nickel, graphite, etc.) or refining/processing facilities.\n\n - Experience leading environmental due diligence for M&A or project development.\n\n - Familiarity with IFC/Equator Principles or corporate sustainability/ESG reporting frameworks.\n\n - Professional certifications such as PE, PG, or CEP.\n\n - Prior experience helping stand up or scale a permitting/compliance function as an organization grew.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$100K – $150K","scrapeableCompensationSalarySummary":"$100K - $150K","compensationTiers":[{"id":"308bff75-5918-4bb9-ae77-8bf68c5c7112","tierSummary":"$100K – $150K","title":null,"additionalInformation":null,"components":[{"id":"17474fc8-4cd8-4866-baba-31199a308b55","summary":"$100K – $150K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":150000}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":150000}]}},{"id":"7a1f8709-98da-4d0d-b825-1f9e16e20fba","title":"Operator","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-06T19:24:41.905+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/7a1f8709-98da-4d0d-b825-1f9e16e20fba","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/7a1f8709-98da-4d0d-b825-1f9e16e20fba/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Position Summary:
The Heavy Equipment Operator plays a critical operational role in supporting mine production through the safe and efficient operation of mobile heavy equipment, including loaders, dozers, excavators, graders, water trucks, and drill rigs.
This position is responsible for conducting equipment inspections, maintaining safe working conditions, contributing to production targets, supporting operational and maintenance teams, and ensuring compliance with MSHA standards and company procedures. The ideal candidate demonstrates strong situational awareness, mechanical aptitude, and the ability to work effectively in a dynamic mining environment.
Housing can be provided onsite.
Essential Duties and Responsibilities:
Operational Responsibilities
· Safely operate heavy equipment including loaders, bulldozers, excavators, graders, water trucks, and blasthole drill rigs.
· Work across all mine areas as needed, including active pits, dumps, haul roads, and process areas.
· Operate equipment in a manner that maximizes productivity while minimizing downtime, fuel use, and equipment wear.
· Perform and document accurate pre‑shift and post‑shift inspections on all assigned equipment.
· Conduct ground support tasks such as shoveling, spotting, barricading, and general labor when required.
· Assist maintenance personnel by communicating equipment issues, supporting troubleshooting, and performing basic servicing.
· Maintain clean, safe, and organized operating areas.
Safety & Compliance
· Always follow MSHA, OSHA, and company safety procedures, including lockout/tagout, hazard reporting, and traffic rules.
· Demonstrate strong hazard recognition skills and actively participate in daily safety meetings.
· Ensure equipment operation and ground activities comply with environmental and regulatory expectations.
· Report unsafe conditions, equipment damage, and near misses immediately.
Collaboration & Communication
· Communicate effectively with supervisors, maintenance, and fellow operators.
· Provide clear shift handover notes to ensure continuity between crews.
· Participate in task training for new operators and support continuous improvement initiatives.
Required Qualifications & Experience:
· Ability to learn and apply federal, state, local, and company safety and environmental regulations.
· Strong written and verbal communication skills.
· Willingness to perform manual labor as needed.
· Flexibility to train on additional equipment and roles.
· Compliance with all company policies and procedures.
· MSHA Surface Miner Training preferred.
· Commitment to maintaining a safe work environment.
· Must possess or be able to obtain a valid driver’s license.
Physical Requirements
· Ability to walk long distances over rough, uneven terrain and climb ladders and structures.
· Ability to lift a minimum of 50 pounds.
· Ability to work in all weather conditions, including extreme temperatures.
· Must wear and utilize all required PPE.
· Must be able to work in environments that may include exposure to fumes, dust, diesel, solvents, sulphuric acid, and other hazardous materials.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nPosition Summary:\n\nThe Heavy Equipment Operator plays a critical operational role in supporting mine production through the safe and efficient operation of mobile heavy equipment, including loaders, dozers, excavators, graders, water trucks, and drill rigs.\n\nThis position is responsible for conducting equipment inspections, maintaining safe working conditions, contributing to production targets, supporting operational and maintenance teams, and ensuring compliance with MSHA standards and company procedures. The ideal candidate demonstrates strong situational awareness, mechanical aptitude, and the ability to work effectively in a dynamic mining environment.\n\nHousing can be provided onsite. \n\n \n\nEssential Duties and Responsibilities:\n\nOperational Responsibilities\n\n· Safely operate heavy equipment including loaders, bulldozers, excavators, graders, water trucks, and blasthole drill rigs.\n\n· Work across all mine areas as needed, including active pits, dumps, haul roads, and process areas.\n\n· Operate equipment in a manner that maximizes productivity while minimizing downtime, fuel use, and equipment wear.\n\n· Perform and document accurate pre‑shift and post‑shift inspections on all assigned equipment.\n\n· Conduct ground support tasks such as shoveling, spotting, barricading, and general labor when required.\n\n· Assist maintenance personnel by communicating equipment issues, supporting troubleshooting, and performing basic servicing.\n\n· Maintain clean, safe, and organized operating areas.\n\n \n\nSafety & Compliance\n\n· Always follow MSHA, OSHA, and company safety procedures, including lockout/tagout, hazard reporting, and traffic rules.\n\n· Demonstrate strong hazard recognition skills and actively participate in daily safety meetings.\n\n· Ensure equipment operation and ground activities comply with environmental and regulatory expectations.\n\n· Report unsafe conditions, equipment damage, and near misses immediately.\n\n \n\nCollaboration & Communication\n\n· Communicate effectively with supervisors, maintenance, and fellow operators.\n\n· Provide clear shift handover notes to ensure continuity between crews.\n\n· Participate in task training for new operators and support continuous improvement initiatives.\n\n \n\nRequired Qualifications & Experience:\n\n· Ability to learn and apply federal, state, local, and company safety and environmental regulations.\n\n· Strong written and verbal communication skills.\n\n· Willingness to perform manual labor as needed.\n\n· Flexibility to train on additional equipment and roles.\n\n· Compliance with all company policies and procedures.\n\n· MSHA Surface Miner Training preferred.\n\n· Commitment to maintaining a safe work environment.\n\n· Must possess or be able to obtain a valid driver’s license.\n\n \n\nPhysical Requirements\n\n· Ability to walk long distances over rough, uneven terrain and climb ladders and structures.\n\n· Ability to lift a minimum of 50 pounds.\n\n· Ability to work in all weather conditions, including extreme temperatures.\n\n· Must wear and utilize all required PPE.\n\n· Must be able to work in environments that may include exposure to fumes, dust, diesel, solvents, sulphuric acid, and other hazardous materials.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"4dbcddee-27e1-4c71-90b3-9e00401afff4","title":"Sr. Process Controls Engineer","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"Remote","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Moab, UT","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}}}],"publishedAt":"2026-09-16T20:44:47.088+00:00","isListed":true,"isRemote":true,"workplaceType":"Remote","address":{"postalAddress":{"addressRegion":"California","addressCountry":"United States","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/4dbcddee-27e1-4c71-90b3-9e00401afff4","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/4dbcddee-27e1-4c71-90b3-9e00401afff4/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for a highly motivated Process Controls Engineer to work on building the critical minerals supply chain.
As a Process Controls Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide controls infrastructure and programming scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team.
Develop standards for controls programming
Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp
Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes
Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes
Support the hiring, mentorship, and day-to-day management of junior process engineers
Develop technoeconomic models of new project opportunities, acquisition targets, and new technologies to inform business development
Prepare and present bankable engineering deliverables to support project financing partners due diligence reviews
Identify, evaluate, and implement process engineering and project management software tools
Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms
Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems
Experience with equipment engineering and design. Including but not limited to:
Brownfield equipment modifications and upgrades
Greenfield equipment design
Evaluation and optimization of operating equipment
Experience with the following industries and/or production environments:
Industrial manufacturing
Large-scale mining or mineral processing
Large-scale chemical production processes
Engineering, procurement, and construction firms
Experience with direct or indirect leadership of engineers and technicians
Experience with project management and execution of medium to large scale (>$5M) capital projects
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nMariana Minerals is looking for a highly motivated Process Controls Engineer to work on building the critical minerals supply chain. \n\nAs a Process Controls Engineer at Mariana Minerals, you will lead the development and deployment of first-of-its-kind chemical refining processes, while also playing a critical role in the development of software for capital project execution and automated plant optimization. Responsibilities will include leading equipment and plant-wide controls infrastructure and programming scopes from concept through to design, installation, commissioning, ramp, and handover to the operations team, and supporting the buildout of an in-house engineering team.\n\n\n\n\nWHAT YOU’LL DO\n\n - Develop standards for controls programming\n\n - Lead equipment scopes from concept and modeling validation, through procurement, engineering, fabrication, installation, commissioning, and ramp\n\n - Manage external equipment providers, technology licensors, and engineering companies to deliver fully integrated and functional mineral refining scopes\n\n - Drive cross-functional teams of lab technicians, pilot plant engineers, process engineers, and project engineers to lead the technical equipment scale-up and de-risk the commercialization of novel mineral refining processes\n\n - Support the hiring, mentorship, and day-to-day management of junior process engineers\n\n - Develop technoeconomic models of new project opportunities, acquisition targets, and new technologies to inform business development \n\n - Prepare and present bankable engineering deliverables to support project financing partners due diligence reviews \n\n - Identify, evaluate, and implement process engineering and project management software tools\n\n - Identify and support opportunities for the software and machine learning teams to automate capital project execution workflows and develop advanced plant control algorithms\n\n\nWHAT YOU’LL BRING\n\n - Strong understanding of engineering fundamentals and demonstrated ability to leverage the understanding to solve challenging problems \n\n - Experience with equipment engineering and design. Including but not limited to:\n\n - Brownfield equipment modifications and upgrades\n\n - Greenfield equipment design \n\n - Evaluation and optimization of operating equipment\n\n - Experience with the following industries and/or production environments:\n\n - Industrial manufacturing\n\n - Large-scale mining or mineral processing\n\n - Large-scale chemical production processes\n\n - Engineering, procurement, and construction firms\n\n - Experience with direct or indirect leadership of engineers and technicians \n\n - Experience with project management and execution of medium to large scale (>$5M) capital projects\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$100K – $175K • Offers Equity • Offers Commission","scrapeableCompensationSalarySummary":"$100K - $175K","compensationTiers":[{"id":"0c5d9cfe-0ad7-4dce-9235-f5f3a2202cef","tierSummary":"Estimated Base Salry, Final Salary Based on level of experience, location, and other factors $100K – $175K • Offers Equity • Offers Commission","title":null,"additionalInformation":null,"components":[{"id":"9cc66035-343a-45eb-84ca-1914d72e5b9b","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"a0121d1a-9c97-4c8b-a5ec-5a56f72b1a7f","summary":"Offers Commission","compensationType":"Commission","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"id":"b4730474-1a76-4d91-9ae9-bfd298667254","summary":"Estimated Base Salry, Final Salary Based on level of experience, location, and other factors $100K – $175K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":175000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Commission","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":175000}]}},{"id":"5782fb34-b2e3-43de-a47c-a52795d031f2","title":"Sr. Environmental Engineer","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Moab, UT","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}}}],"publishedAt":"2026-09-16T21:29:04.004+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/5782fb34-b2e3-43de-a47c-a52795d031f2","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/5782fb34-b2e3-43de-a47c-a52795d031f2/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is hiring a Sr. Environmental Engineer to provide technical environmental engineering support across our U.S. mining, processing, and refining project sites in a fast-paced, multi-project environment. Reporting to the Global Environmental Permitting Lead, you will apply your engineering background to environmental studies, permitting technical support, monitoring program design, and the integration of environmental requirements into engineering and design decisions across FEL 1–3, detailed design, construction, and operations.
This role requires the ability to move quickly across multiple concurrent projects, prioritize effectively, and deliver high-quality technical work under compressed timelines. You will also support due diligence and sustainability initiatives, and work closely with the Global Environmental Permitting Lead, the Regional Permitting and Compliance Environmental Engineer, and internal stakeholders (process engineering, operations, legal, and executive leadership) as needed.
Technical Environmental Engineering
Conduct and oversee environmental technical studies (air quality modeling, water quality/hydrology assessments, stormwater design, waste characterization) supporting permitting and compliance across multiple concurrent projects.
Design and implement environmental monitoring programs (air, water, stormwater, wildlife) and analyze results to support compliance reporting and technical decision-making.
Support integration of environmental requirements into FEL 1–3 and detailed design, partnering with process and civil engineering teams on technical trade-offs.
Prepare technical sections of permit applications, EIS/EA chapters, and supporting engineering documentation.
EMS & Compliance Technical Support
Support development, implementation, and continuous improvement of site-level Environmental Management Systems (EMS).
Provide technical support for stormwater, spill prevention, waste management, and pollution-control programs, including field inspections as needed.
Assist in developing remediation and corrective action plans, applying sound engineering judgment to resolve issues quickly.
Cross-Project & Fast-Paced Delivery
Flex across multiple active projects and shifting priorities, delivering quality technical work under compressed timelines and with limited advance notice.
Support due diligence technical reviews for acquisitions and new project development, including environmental data review and site assessments.
Contribute technical data and analysis to corporate sustainability and ESG reporting.
Stakeholder Collaboration
Partner with process engineering, operations, and legal on technical environmental questions, and communicate clearly with the Global Environmental Permitting Lead and project teams.
Support the Global Environmental Permitting Lead and Regional Permitting and Compliance Environmental Engineer with technical analysis, data, and documentation as needed.
Required
Bachelor's or master's degree in Environmental Engineering, Civil/Environmental Engineering, Environmental Science, or a related field.
5+ years of environmental engineering experience in mining, energy, or large infrastructure, with a demonstrated ability to work effectively in a fast-paced, multi-project environment.
Working technical knowledge of environmental studies and modeling (air, water, stormwater) and monitoring program design.
Familiarity with U.S. environmental regulations (CAA, CWA, RCRA, ESA, EPCRA) and their technical/engineering implications.
Experience supporting permit applications, EIS/EA technical sections, or environmental engineering design packages.
Strong analytical, technical writing, and project-prioritization skills.
Preferred
Experience with critical minerals (lithium, nickel, graphite, etc.) or refining/processing facilities.
Experience with EMS design or implementation (ISO 14001 or similar frameworks).
Familiarity with IFC/Equator Principles or ESG data reporting.
EIT/PE, or progress toward professional engineering licensure.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is hiring a Sr. Environmental Engineer to provide technical environmental engineering support across our U.S. mining, processing, and refining project sites in a fast-paced, multi-project environment. Reporting to the Global Environmental Permitting Lead, you will apply your engineering background to environmental studies, permitting technical support, monitoring program design, and the integration of environmental requirements into engineering and design decisions across FEL 1–3, detailed design, construction, and operations.\n\nThis role requires the ability to move quickly across multiple concurrent projects, prioritize effectively, and deliver high-quality technical work under compressed timelines. You will also support due diligence and sustainability initiatives, and work closely with the Global Environmental Permitting Lead, the Regional Permitting and Compliance Environmental Engineer, and internal stakeholders (process engineering, operations, legal, and executive leadership) as needed.\n\n\n\n\nWHAT YOU'LL DO\n\nTechnical Environmental Engineering\n\n - Conduct and oversee environmental technical studies (air quality modeling, water quality/hydrology assessments, stormwater design, waste characterization) supporting permitting and compliance across multiple concurrent projects.\n\n - Design and implement environmental monitoring programs (air, water, stormwater, wildlife) and analyze results to support compliance reporting and technical decision-making.\n\n - Support integration of environmental requirements into FEL 1–3 and detailed design, partnering with process and civil engineering teams on technical trade-offs.\n\n - Prepare technical sections of permit applications, EIS/EA chapters, and supporting engineering documentation.\n\nEMS & Compliance Technical Support\n\n - Support development, implementation, and continuous improvement of site-level Environmental Management Systems (EMS).\n\n - Provide technical support for stormwater, spill prevention, waste management, and pollution-control programs, including field inspections as needed.\n\n - Assist in developing remediation and corrective action plans, applying sound engineering judgment to resolve issues quickly.\n\nCross-Project & Fast-Paced Delivery\n\n - Flex across multiple active projects and shifting priorities, delivering quality technical work under compressed timelines and with limited advance notice.\n\n - Support due diligence technical reviews for acquisitions and new project development, including environmental data review and site assessments.\n\n - Contribute technical data and analysis to corporate sustainability and ESG reporting.\n\nStakeholder Collaboration\n\n - Partner with process engineering, operations, and legal on technical environmental questions, and communicate clearly with the Global Environmental Permitting Lead and project teams.\n\n - Support the Global Environmental Permitting Lead and Regional Permitting and Compliance Environmental Engineer with technical analysis, data, and documentation as needed.\n\n\n\n\nQUALIFICATIONS\n\nRequired\n\n - Bachelor's or master's degree in Environmental Engineering, Civil/Environmental Engineering, Environmental Science, or a related field.\n\n - 5+ years of environmental engineering experience in mining, energy, or large infrastructure, with a demonstrated ability to work effectively in a fast-paced, multi-project environment.\n\n - Working technical knowledge of environmental studies and modeling (air, water, stormwater) and monitoring program design.\n\n - Familiarity with U.S. environmental regulations (CAA, CWA, RCRA, ESA, EPCRA) and their technical/engineering implications.\n\n - Experience supporting permit applications, EIS/EA technical sections, or environmental engineering design packages.\n\n - Strong analytical, technical writing, and project-prioritization skills.\n\nPreferred\n\n - Experience with critical minerals (lithium, nickel, graphite, etc.) or refining/processing facilities.\n\n - Experience with EMS design or implementation (ISO 14001 or similar frameworks).\n\n - Familiarity with IFC/Equator Principles or ESG data reporting.\n\n - EIT/PE, or progress toward professional engineering licensure.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$100K – $150K","scrapeableCompensationSalarySummary":"$100K - $150K","compensationTiers":[{"id":"f352d27b-cad5-4a6c-85d7-02c9fcdb6d78","tierSummary":"$100K – $150K","title":null,"additionalInformation":null,"components":[{"id":"ec829683-57a2-4fcc-90bc-f37237e37261","summary":"$100K – $150K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":150000}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":100000,"maxValue":150000}]}},{"id":"194ca8f6-b04f-47c9-a71c-a9d6a64020d8","title":"Sr./Staff Architect ","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-09-18T16:57:18.348+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/194ca8f6-b04f-47c9-a71c-a9d6a64020d8","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/194ca8f6-b04f-47c9-a71c-a9d6a64020d8/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for an architect to work on building the critical minerals supply chain.
As an architect at Mariana Minerals, you will lead the architectural design of commercial and industrial buildings and assets from requirements definition through concept design and construction support.
Develop architectural concepts and designs in collaboration with other disciplines.
Produce architectural specifications, drawings, and reports both directly and with the support of designers.
Collaborate with designers, engineering, and construction to develop efficient and effective designs.
Be responsible for the development of safe architectural designs.
Work as part of teams, managing or being managed by others as required for each project.
Serve as architect of record for some projects (for licensed candidates).
Lead or support permitting processes with Authorities Having Jurisdiction (AHJ).
Participate in project planning and scheduling activities and deliver to project deadlines.
Develop and implement discipline-specific practices and procedures to improve productivity and efficiency.
Actively engage in development of Mariana’s internal software tools.
Bachelor’s degree in architecture or equivalent experience.
7+ years of professional experience.
Knowledge of building codes and architectural project deliverables.
Ability to manage multiple projects simultaneously in a deadline-driven environment.
Ability to work effectively with cross-functional teams, manage competing priorities, and deliver high-quality engineering packages under schedule constraints.
Licensed architect in any U.S. state.
Mining, mineral processing, metallurgical, chemical, or heavy industrial facility experience.
Proficiency in 2D and/or 3D design software such as AutoCAD and Revit with knowledge of rendering tools being a bonus.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is looking for an architect to work on building the critical minerals supply chain.\n\nAs an architect at Mariana Minerals, you will lead the architectural design of commercial and industrial buildings and assets from requirements definition through concept design and construction support.\n\n\n\n\n\nWHAT YOU’LL DO\n\n - Develop architectural concepts and designs in collaboration with other disciplines.\n\n - Produce architectural specifications, drawings, and reports both directly and with the support of designers.\n\n - Collaborate with designers, engineering, and construction to develop efficient and effective designs.\n\n - Be responsible for the development of safe architectural designs.\n\n - Work as part of teams, managing or being managed by others as required for each project.\n\n - Serve as architect of record for some projects (for licensed candidates).\n\n - Lead or support permitting processes with Authorities Having Jurisdiction (AHJ).\n\n - Participate in project planning and scheduling activities and deliver to project deadlines.\n\n - Develop and implement discipline-specific practices and procedures to improve productivity and efficiency.\n\n - Actively engage in development of Mariana’s internal software tools.\n\n\n\n\nWHAT YOU’LL BRING\n\n - Bachelor’s degree in architecture or equivalent experience.\n\n - 7+ years of professional experience.\n\n - Knowledge of building codes and architectural project deliverables.\n\n - Ability to manage multiple projects simultaneously in a deadline-driven environment.\n\n - Ability to work effectively with cross-functional teams, manage competing priorities, and deliver high-quality engineering packages under schedule constraints.\n\n\n\n\n\nPREFERRED\n\n - Licensed architect in any U.S. state.\n\n - Mining, mineral processing, metallurgical, chemical, or heavy industrial facility experience.\n\n - Proficiency in 2D and/or 3D design software such as AutoCAD and Revit with knowledge of rendering tools being a bonus.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$130K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$130K - $200K","compensationTiers":[{"id":"6753a7ef-7596-468b-96ee-b03330a64386","tierSummary":"$130K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"06cb9534-d17b-4ba4-aec0-cbedd091fec1","summary":"$130K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":130000,"maxValue":200000},{"id":"6d1fa7eb-005b-44ae-b9a5-51b3bca059be","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":130000,"maxValue":200000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"920eabfb-9308-47a1-add4-65e4d9ea5c96","title":"Technical Product Manager, Data & Analytics Platform ","department":"Product Development","team":"Product Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-09-23T00:05:22.206+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/920eabfb-9308-47a1-add4-65e4d9ea5c96","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/920eabfb-9308-47a1-add4-65e4d9ea5c96/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our data systems don't live in a vacuum — they feed process simulators, drive site automation, and are the substrate the business runs its decisions on.
We're hiring a Technical Product Manager to be the single product owner for the data engineering family — the data platform, analytics, data science, and the AI and agentic workflows built on top of them. Today this work is spread across technical leads and absorbed informally, with no one setting direction across the whole. Your job is to change that: decide what the data organization builds and why, get stakeholders aligned behind it, and make sure engineers can stay heads-down on the work that matters.
This is a hybrid Pioneer/Settler role: you'll get lightweight demos and PoCs built on ambiguous problems, and you'll bring order and cohesive ownership to data work streams that already exist. You'll prioritize ruthlessly and visibly — being explicit about what will not be worked on — and set direction rather than waiting for it to be handed to you.
Talk to our internal teams constantly — operators, machine learning engineers, software developers, analysts, and data users are your users, and their problems set the roadmap.
Own the roadmap for the data platform, analytics, and data science tooling: what gets built next, for whom, and why.
Write the product specs, KPIs, and success metrics that turn ambiguous asks into scoped, shippable work.
Own prioritization and stakeholder alignment so engineers stay focused on deep technical work.
Make the build-vs-buy calls for BI and analytics, and prioritize tooling that lets stakeholders answer their own questions instead of adding headcount.
Own where agents fit versus conventional software, and drive AI and agentic workflows from demo to adopted tool.
Decide which new data streams get integrated, when, and to what standard as new sensors and sources come online.
Set the bar for what \"supported\" and \"correct\" mean as tools graduate from scripts and spreadsheets, and be explicit about what won't be migrated.
Structure from ambiguity: Bring direction to cross-disciplinary initiatives and align stakeholders rather than waiting for direction.
Ruthless, visible prioritization: Be explicit about what will not be worked on, not just what will.
Hybrid Pioneer/Settler: Get initial prototypes built with stakeholders, then write the roadmap to validate the use case and, if worth it, take it to production.
Ecosystem fluency: Understand where Mariana's data sits relative to the systems that consume it and relative to the current frontier of LLM capability, so prioritization calls stay well-calibrated.
Must have
4–8+ years in technical product management, data platform or analytics product roles, or equivalent experience leading cross-disciplinary technical programs
Comfortable being the only PM in a highly technical room — you know when to drive a decision, when to defer to engineers, and how to build credibility without being the most technical person there
Enough depth in data infrastructure and analytics to earn credibility with data engineers, data scientists, and analysts, and to know when a technical answer is a good one
Working fluency with the current LLM/foundation-model landscape and where agentic approaches genuinely fit versus conventional software
Track record of bringing structure to ambiguous, cross-functional initiatives: setting direction, aligning stakeholders, and owning outcomes end-to-end
Hands-on prototyping ability — you can get a PoC built with stakeholders, not just write requirements for one
Strong prioritization and tradeoff skills — you know when to say no, and you say it visibly
Exceptional written and verbal communication across audiences, from data engineers to operators to executives
Nice to have
Product ownership of a data platform, warehouse, or analytics stack in production
Experience with BI/analytics tooling strategy (Hex, Looker, or embedded analytics)
Experience shipping LLM-powered or agentic internal tools
Background in mining, energy, chemicals, manufacturing, or other heavy industry
Experience leading the transition from spreadsheets and scripts to supported software
Most data PM roles hand you a mature warehouse and a dashboard backlog. This role hands you the data platform and analytics layer the business runs on, plus the AI workflows that will increasingly run on top of it, at the moment they move from ad hoc scripts and informal ownership into supported software. At Mariana, you don't need to validate product-market fit, because we are the market: if you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our data systems don't live in a vacuum — they feed process simulators, drive site automation, and are the substrate the business runs its decisions on.\n\nWe're hiring a Technical Product Manager to be the single product owner for the data engineering family — the data platform, analytics, data science, and the AI and agentic workflows built on top of them. Today this work is spread across technical leads and absorbed informally, with no one setting direction across the whole. Your job is to change that: decide what the data organization builds and why, get stakeholders aligned behind it, and make sure engineers can stay heads-down on the work that matters.\n\nThis is a hybrid Pioneer/Settler role: you'll get lightweight demos and PoCs built on ambiguous problems, and you'll bring order and cohesive ownership to data work streams that already exist. You'll prioritize ruthlessly and visibly — being explicit about what will not be worked on — and set direction rather than waiting for it to be handed to you.\n\n\n\n\nWHAT YOU'LL DO\n\n - Talk to our internal teams constantly — operators, machine learning engineers, software developers, analysts, and data users are your users, and their problems set the roadmap.\n\n - Own the roadmap for the data platform, analytics, and data science tooling: what gets built next, for whom, and why.\n\n - Write the product specs, KPIs, and success metrics that turn ambiguous asks into scoped, shippable work.\n\n - Own prioritization and stakeholder alignment so engineers stay focused on deep technical work.\n\n - Make the build-vs-buy calls for BI and analytics, and prioritize tooling that lets stakeholders answer their own questions instead of adding headcount.\n\n - Own where agents fit versus conventional software, and drive AI and agentic workflows from demo to adopted tool.\n\n - Decide which new data streams get integrated, when, and to what standard as new sensors and sources come online.\n\n - Set the bar for what \"supported\" and \"correct\" mean as tools graduate from scripts and spreadsheets, and be explicit about what won't be migrated.\n \n \n\n\nHOW YOU'LL OPERATE\n\n - Structure from ambiguity: Bring direction to cross-disciplinary initiatives and align stakeholders rather than waiting for direction.\n\n - Ruthless, visible prioritization: Be explicit about what will not be worked on, not just what will.\n\n - Hybrid Pioneer/Settler: Get initial prototypes built with stakeholders, then write the roadmap to validate the use case and, if worth it, take it to production.\n\n - Ecosystem fluency: Understand where Mariana's data sits relative to the systems that consume it and relative to the current frontier of LLM capability, so prioritization calls stay well-calibrated.\n \n \n\n\nWHAT WE'RE LOOKING FOR\n\nMust have\n\n - 4–8+ years in technical product management, data platform or analytics product roles, or equivalent experience leading cross-disciplinary technical programs\n\n - Comfortable being the only PM in a highly technical room — you know when to drive a decision, when to defer to engineers, and how to build credibility without being the most technical person there\n\n - Enough depth in data infrastructure and analytics to earn credibility with data engineers, data scientists, and analysts, and to know when a technical answer is a good one\n\n - Working fluency with the current LLM/foundation-model landscape and where agentic approaches genuinely fit versus conventional software\n\n - Track record of bringing structure to ambiguous, cross-functional initiatives: setting direction, aligning stakeholders, and owning outcomes end-to-end\n\n - Hands-on prototyping ability — you can get a PoC built with stakeholders, not just write requirements for one\n\n - Strong prioritization and tradeoff skills — you know when to say no, and you say it visibly\n\n - Exceptional written and verbal communication across audiences, from data engineers to operators to executives\n\nNice to have\n\n - Product ownership of a data platform, warehouse, or analytics stack in production\n\n - Experience with BI/analytics tooling strategy (Hex, Looker, or embedded analytics)\n\n - Experience shipping LLM-powered or agentic internal tools\n\n - Background in mining, energy, chemicals, manufacturing, or other heavy industry\n\n - Experience leading the transition from spreadsheets and scripts to supported software\n \n \n\n\nWHY THIS ROLE\n\nMost data PM roles hand you a mature warehouse and a dashboard backlog. This role hands you the data platform and analytics layer the business runs on, plus the AI workflows that will increasingly run on top of it, at the moment they move from ad hoc scripts and informal ownership into supported software. At Mariana, you don't need to validate product-market fit, because we are the market: if you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$115K – $208K • Offers Equity","scrapeableCompensationSalarySummary":"$115K - $208K","compensationTiers":[{"id":"0b75554c-ee77-46ca-9463-a15e8c840935","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $115K – $208K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"3b8b2e40-3316-47b4-bc1a-93cd9b3ba09c","summary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $115K – $208K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":115000,"maxValue":208000},{"id":"b39705bd-62d2-4a42-90c0-8d96be507a6e","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":115000,"maxValue":208000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"4fdfca83-0431-47cc-8c90-f806ea723092","title":"Controls Technician ","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"East Texas","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-08T17:55:08.318+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Joaquin"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/4fdfca83-0431-47cc-8c90-f806ea723092","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/4fdfca83-0431-47cc-8c90-f806ea723092/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Controls Technician provides electrical and controls support to keep our East Texas refinery running safely and reliably. In this role, you'll troubleshoot and repair electrical and controls wiring and programming across production equipment, working with 480V three-phase and single-phase AC circuits, transformers, switchgear, and motor control centers. You'll run tests, isolate problems, and keep our control systems healthy through preventive maintenance and upgrades. Because we're a startup, you'll also have a real hand in shaping how our maintenance program runs, from PM planning to CMMS, so the ideal fit is someone who likes solving problems and improving the way work gets done.
Responsibilities
Troubleshoot and diagnose electrical and controls issues across industrial equipment and processes, using system knowledge and the right instruments for the voltages and currents involved
Install, test, and maintain electrical equipment, including motor control centers, switchgear, transformers, generators, circuits, and load centers, working from blueprints and one-line diagrams
Maintain, program, and upgrade control systems, including Allen Bradley PLCs, VFDs, HMIs, and industrial networks
Perform preventive maintenance on electrical and control systems, including disassembly, cleaning, reassembly, and calibration, and recommend equipment for inclusion in PM programs
Execute the maintenance schedule, scope each job and determine the best approach, and log work and asset history accurately in our CMMS
Work closely with operations, engineering, mechanics, and the maintenance crew; flag potential electrical hazards and suggest improvements to planning, scheduling, PM, and storeroom processes
Follow all OSHA and company safety procedures and local, state, and national electrical codes; keep the shop safe and organized and protect product quality at all times
Qualifications & Experience
3 + years of industrial or manufacturing maintenance experience focused on controls and electronics
Proficiency with Allen Bradley controls equipment (SLC 500, ControlLogix, PanelView Plus, VFDs), HMIs, and industrial networks, along with the PLC software that supports them
Able to own controls projects from start to finish
Hands-on experience with 480V three-phase and single-phase AC circuits, transformers, switchgear, and motor control centers, plus strong knowledge of electrical power and distribution systems
Ability to read one-line diagrams, blueprints, schematics, and manufacturer specifications, and to calculate circuit load requirements
Well-rounded maintenance background, including hydraulics, pneumatics, and machine tools
Skilled with hand and power tools and electrical test and measurement equipment
Hydrometallurgy, mining, or battery materials experience is a plus
Schedule
12-hour shifts, 6 AM–6 PM
Sunday–Tuesday plus every other Wednesday, or Thursday–Saturday plus every other Wednesday
A night rotation will be added in the near future
Working Environment & Physical Requirements
Work in the processing plant and shop in all weather conditions, including extreme temperatures, with exposure to chemicals and other hazardous materials
Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods
Ability to climb ladders and structures, with the manual dexterity to use hand and power tools
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Controls Technician provides electrical and controls support to keep our East Texas refinery running safely and reliably. In this role, you'll troubleshoot and repair electrical and controls wiring and programming across production equipment, working with 480V three-phase and single-phase AC circuits, transformers, switchgear, and motor control centers. You'll run tests, isolate problems, and keep our control systems healthy through preventive maintenance and upgrades. Because we're a startup, you'll also have a real hand in shaping how our maintenance program runs, from PM planning to CMMS, so the ideal fit is someone who likes solving problems and improving the way work gets done.\n\nResponsibilities\n\n - Troubleshoot and diagnose electrical and controls issues across industrial equipment and processes, using system knowledge and the right instruments for the voltages and currents involved\n\n - Install, test, and maintain electrical equipment, including motor control centers, switchgear, transformers, generators, circuits, and load centers, working from blueprints and one-line diagrams\n\n - Maintain, program, and upgrade control systems, including Allen Bradley PLCs, VFDs, HMIs, and industrial networks\n\n - Perform preventive maintenance on electrical and control systems, including disassembly, cleaning, reassembly, and calibration, and recommend equipment for inclusion in PM programs\n\n - Execute the maintenance schedule, scope each job and determine the best approach, and log work and asset history accurately in our CMMS\n\n - Work closely with operations, engineering, mechanics, and the maintenance crew; flag potential electrical hazards and suggest improvements to planning, scheduling, PM, and storeroom processes\n\n - Follow all OSHA and company safety procedures and local, state, and national electrical codes; keep the shop safe and organized and protect product quality at all times\n\nQualifications & Experience\n\n - 3 + years of industrial or manufacturing maintenance experience focused on controls and electronics\n\n - Proficiency with Allen Bradley controls equipment (SLC 500, ControlLogix, PanelView Plus, VFDs), HMIs, and industrial networks, along with the PLC software that supports them\n\n - Able to own controls projects from start to finish\n\n - Hands-on experience with 480V three-phase and single-phase AC circuits, transformers, switchgear, and motor control centers, plus strong knowledge of electrical power and distribution systems\n\n - Ability to read one-line diagrams, blueprints, schematics, and manufacturer specifications, and to calculate circuit load requirements\n\n - Well-rounded maintenance background, including hydraulics, pneumatics, and machine tools\n\n - Skilled with hand and power tools and electrical test and measurement equipment\n\n - Hydrometallurgy, mining, or battery materials experience is a plus\n\nSchedule\n\n - 12-hour shifts, 6 AM–6 PM\n\n - Sunday–Tuesday plus every other Wednesday, or Thursday–Saturday plus every other Wednesday\n\n - A night rotation will be added in the near future\n\nWorking Environment & Physical Requirements\n\n - Work in the processing plant and shop in all weather conditions, including extreme temperatures, with exposure to chemicals and other hazardous materials\n\n - Ability to lift a minimum of 50 pounds and to stand, walk, and work in confined or elevated spaces for extended periods\n\n - Ability to climb ladders and structures, with the manual dexterity to use hand and power tools\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"f3c3c146-c944-424c-a2f0-bd9e9bf4a8a5","title":"Technical Product Manager, ML & Robotics ","department":"Product Development","team":"Product Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-09-23T00:05:24.773+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/f3c3c146-c944-424c-a2f0-bd9e9bf4a8a5","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/f3c3c146-c944-424c-a2f0-bd9e9bf4a8a5/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our ML systems don't live in a vacuum — they run chemistry and process simulators, see and act in our plants through sensors and robotic systems, and increasingly move toward autonomous industrial process and chemical operations.
We're hiring a Technical Product Manager to be the single product owner for machine learning and industrial robotics — the ML platform, the simulators it runs, and the perception and robotics initiatives built on it — and to own the seam between our applied AI/ML organization and our software engineering organization. Today this work is split across technical leads with no one setting direction across the whole. Your job is to change that: decide what the ML organization pursues and why, get stakeholders aligned behind it, and make sure engineers can stay heads-down on the work that matters.
Autonomy and robotics here mean industrial: models, perception systems, and robotic hardware that increasingly close the loop on how our plants and chemical processes run.
Talk to our internal teams constantly — operators, process engineers, and MLEs are your users, and their problems set the roadmap.
Own the roadmap for the ML platform: which capabilities it needs next, for which use cases, and why.
Write the product specs, KPIs, and success metrics that turn ambiguous ML and autonomy asks into scoped, shippable work.
Own prioritization and stakeholder alignment so MLEs stay focused on deep technical work.
Own the path to process autonomy — models that inform, and increasingly set, process and chemical operating decisions — and the simulators that underpin it.
Own the roadmap for vision, sensor, and robotics initiatives: which plant problems get a model or a robot first, and what \"good enough to deploy\" means for each.
Own the seam between the applied AI/ML org and the software engineering org, and the boundary with MarianaOS, so nothing falls in the gap.
Define what it takes for a model, simulator, or robot to be trusted in production, and be explicit about which initiatives won't be pursued.
Structure from ambiguity: Bring direction to cross-disciplinary initiatives and align stakeholders rather than waiting for direction.
Ruthless, visible prioritization: Be explicit about what will not be worked on, not just what will.
Hybrid Pioneer/Settler: Prioritize and ship lightweight demos on ambiguous problems while bringing structure to existing work streams that lack cohesive ownership.
Ecosystem fluency: Understand the Mariana ML, perception, and robotics ecosystem as a whole — including where it sits relative to the current frontier of model capability — so prioritization calls stay well-calibrated.
Must have
4–8+ years in technical product management, ML platform or robotics product roles, or equivalent experience leading cross-disciplinary technical programs
Comfortable being the only PM in a highly technical room — you know when to drive a decision, when to defer to engineers, and how to build credibility without being the most technical person there
Enough depth in ML systems — training, evaluation, deployment, perception, simulation — to earn credibility with both ML engineers and software engineers, and to know when a technical answer is a good one
Track record of bringing structure to ambiguous, cross-functional initiatives: setting direction, aligning stakeholders, and owning outcomes end-to-end
Strong prioritization and tradeoff skills — you know when to say no, and you say it visibly
Exceptional written and verbal communication across audiences, from ML engineers to operators to executives
Nice to have
Product ownership of an ML platform, MLOps stack, or simulation system in production
Prior work on industrial robotics, perception, or closed-loop optimization of chemical or industrial process systems
Familiarity with process simulation toolchains (SysCAD or similar)
Background in mining, energy, chemicals, manufacturing, or other heavy industry — especially industrial automation or sensor/vision data
Working fluency with the current LLM/foundation-model landscape and where it applies to ML and robotics workflows
Most ML PM roles hand you one model with an established roadmap. This role hands you the ML platform's path to autonomous process and chemical operations, the simulators that underpin it, the robotic systems that act on it, and the infrastructure it all runs on, at the moment they move from ad hoc experimentation and informal ownership into supported software. At Mariana, you don't need to validate product-market fit, because we are the market: if you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our ML systems don't live in a vacuum — they run chemistry and process simulators, see and act in our plants through sensors and robotic systems, and increasingly move toward autonomous industrial process and chemical operations.\n\nWe're hiring a Technical Product Manager to be the single product owner for machine learning and industrial robotics — the ML platform, the simulators it runs, and the perception and robotics initiatives built on it — and to own the seam between our applied AI/ML organization and our software engineering organization. Today this work is split across technical leads with no one setting direction across the whole. Your job is to change that: decide what the ML organization pursues and why, get stakeholders aligned behind it, and make sure engineers can stay heads-down on the work that matters.\n\nAutonomy and robotics here mean industrial: models, perception systems, and robotic hardware that increasingly close the loop on how our plants and chemical processes run.\n\n\n\n\nWHAT YOU'LL DO\n\n - Talk to our internal teams constantly — operators, process engineers, and MLEs are your users, and their problems set the roadmap.\n\n - Own the roadmap for the ML platform: which capabilities it needs next, for which use cases, and why.\n\n - Write the product specs, KPIs, and success metrics that turn ambiguous ML and autonomy asks into scoped, shippable work.\n\n - Own prioritization and stakeholder alignment so MLEs stay focused on deep technical work.\n\n - Own the path to process autonomy — models that inform, and increasingly set, process and chemical operating decisions — and the simulators that underpin it.\n\n - Own the roadmap for vision, sensor, and robotics initiatives: which plant problems get a model or a robot first, and what \"good enough to deploy\" means for each.\n\n - Own the seam between the applied AI/ML org and the software engineering org, and the boundary with MarianaOS, so nothing falls in the gap.\n\n - Define what it takes for a model, simulator, or robot to be trusted in production, and be explicit about which initiatives won't be pursued.\n \n \n\n\nHOW YOU'LL OPERATE\n\n - Structure from ambiguity: Bring direction to cross-disciplinary initiatives and align stakeholders rather than waiting for direction.\n\n - Ruthless, visible prioritization: Be explicit about what will not be worked on, not just what will.\n\n - Hybrid Pioneer/Settler: Prioritize and ship lightweight demos on ambiguous problems while bringing structure to existing work streams that lack cohesive ownership.\n\n - Ecosystem fluency: Understand the Mariana ML, perception, and robotics ecosystem as a whole — including where it sits relative to the current frontier of model capability — so prioritization calls stay well-calibrated.\n \n \n\n\nWHAT WE'RE LOOKING FOR\n\nMust have\n\n - 4–8+ years in technical product management, ML platform or robotics product roles, or equivalent experience leading cross-disciplinary technical programs\n\n - Comfortable being the only PM in a highly technical room — you know when to drive a decision, when to defer to engineers, and how to build credibility without being the most technical person there\n\n - Enough depth in ML systems — training, evaluation, deployment, perception, simulation — to earn credibility with both ML engineers and software engineers, and to know when a technical answer is a good one\n\n - Track record of bringing structure to ambiguous, cross-functional initiatives: setting direction, aligning stakeholders, and owning outcomes end-to-end\n\n - Strong prioritization and tradeoff skills — you know when to say no, and you say it visibly\n\n - Exceptional written and verbal communication across audiences, from ML engineers to operators to executives\n\nNice to have\n\n - Product ownership of an ML platform, MLOps stack, or simulation system in production\n\n - Prior work on industrial robotics, perception, or closed-loop optimization of chemical or industrial process systems\n\n - Familiarity with process simulation toolchains (SysCAD or similar)\n\n - Background in mining, energy, chemicals, manufacturing, or other heavy industry — especially industrial automation or sensor/vision data\n\n - Working fluency with the current LLM/foundation-model landscape and where it applies to ML and robotics workflows\n \n \n\n\nWHY THIS ROLE\n\nMost ML PM roles hand you one model with an established roadmap. This role hands you the ML platform's path to autonomous process and chemical operations, the simulators that underpin it, the robotic systems that act on it, and the infrastructure it all runs on, at the moment they move from ad hoc experimentation and informal ownership into supported software. At Mariana, you don't need to validate product-market fit, because we are the market: if you identify a real problem and build a real solution, adoption is a conversation, not a sales cycle.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$115K – $208K • Offers Equity","scrapeableCompensationSalarySummary":"$115K - $208K","compensationTiers":[{"id":"0b75554c-ee77-46ca-9463-a15e8c840935","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $115K – $208K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"3b8b2e40-3316-47b4-bc1a-93cd9b3ba09c","summary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $115K – $208K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":115000,"maxValue":208000},{"id":"b39705bd-62d2-4a42-90c0-8d96be507a6e","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":115000,"maxValue":208000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"356d39f8-7fa4-440e-a04e-c70705c322db","title":"Sr. Data Scientist ","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-09-23T00:05:14.509+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/356d39f8-7fa4-440e-a04e-c70705c322db","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/356d39f8-7fa4-440e-a04e-c70705c322db/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our data doesn't live in a vacuum — it comes off sensors, assays, lab benches, and plant logs, and it's what the business uses to decide what to run, what to buy, what to fix, and what to build next.
We're hiring a Senior Data Scientist to be the person who makes those numbers trustworthy and legible. You'll own the statistics: how we measure recovery and throughput, how we know a process change actually worked, how much of a swing is signal and how much is assay noise, and what the reporting layer says when an operator or an executive opens it.
This is not an ML modeling role and not a data engineering role. Our MLEs build the models and our data engineers move the data. You bring statistical rigor and clear reporting to a company generating more data than it currently knows how to interpret, and you make sure the conclusions people draw from it are the right ones.
Design and analyze plant trials and experiments — DOE, sample sizing, control selection, and the analysis that says whether a process change did what it was supposed to do and at what confidence.
Own the definitions of the metrics the business runs on: recovery, grade, throughput, yield, uptime, unit cost. Decide what each one means, make the definition consistent across teams, and defend it when someone wants to compute it differently.
Build and own the reporting and analytics layer — the recurring reporting, the dashboards, and the self-serve tooling that lets operators, engineers, and business leads answer their own questions.
Quantify uncertainty honestly: sampling error, assay variability, instrument drift, measurement system analysis.
Apply statistical process control and capability analysis to plant operations — know when a process has actually shifted versus when it's a normal excursion.
Run the deep-dive analyses that don't have a home: why last month's recovery dropped, what's driving cost variance, which of these three suppliers is actually better, whether this correlation is real.
Do forecasting and estimation for production, cost, and capacity planning — applied statistics that informs commitments, not research models.
Partner with the Technical Product Manager for Data & Analytics Platform on what the reporting and analytics stack needs next, and be a demanding internal customer of the data platform when the data isn't fit for purpose.
Raise the analytical bar across the company: review other people's analyses, catch the flawed comparison before it reaches a decision meeting, and teach the teams around you enough statistics to stop making the same mistake twice.
Write findings up so they're actually used — a clear memo a non-statistician can act on, not a notebook that needs you in the room.
Rigor with a deadline: You know the difference between the analysis worth another week and the one that's good enough to decide on today, and you say which is which.
Skeptical by default: You ask how the data was collected before you analyze it, and you're the person who notices the sensor was miscalibrated for three weeks.
Structure from ambiguity: Turn a vague business question into a well-posed statistical one, get the data you need, and own the answer end to end.
Explicit about confidence: Communicate uncertainty in a way that helps people decide, rather than hedging so heavily the analysis becomes useless.
Ecosystem fluency: Understand where your data comes from, what the models and simulators downstream do with it, and where the reporting layer sits relative to the platform underneath it.
Must have
3–6+ years in data science, statistics, analytics, or a quantitative research role where you owned analyses that drove real decisions
Deep applied statistics: experimental design, hypothesis testing, regression, uncertainty quantification — and the judgment to know which tool fits the question and which assumption you just violated
Strong SQL and Python (pandas, statsmodels, scipy) — enough to get your own data, run your own analysis, and produce your own reporting without waiting on someone else
Track record building reporting and dashboards people actually use, with the product sense to know what belongs on a dashboard versus in a memo
Ability to work with messy, real-world measurement data — missing values, inconsistent sampling, instrument error — and be clear about what it can and can't support
Exceptional written communication; much of this job is making a technical finding land with operators, engineers, and executives
Comfort being the statistical authority in the room
Nice to have
Background in mining, metallurgy, chemicals, energy, manufacturing, or other heavy industry — especially metallurgical accounting, mass balance reconciliation, or sampling theory
Experience with statistical process control, or measurement system analysis
Experience with BI and analytics tooling (Hex, Looker, or embedded analytics) and an opinion about how to deploy them
Degree in statistics, chemical engineering, chemistry, operations research, economics, or a related quantitative field
Experience building an analytics function at a company where one didn't exist yet
Working fluency with LLM-assisted analysis and where it genuinely speeds up analytical work versus where it quietly introduces errors
Most senior data scientist roles are one of two things: a modeling role wearing an analytics title, or a dashboard-request queue. This is neither. You own how a physical, capital-intensive business measures itself, at the moment those measurements move from spreadsheets and tribal knowledge into something supported and shared. At Mariana, you don't need to validate product-market fit, because we are the market: if you find something real in the data, the people who can act on it are down the hall.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our data doesn't live in a vacuum — it comes off sensors, assays, lab benches, and plant logs, and it's what the business uses to decide what to run, what to buy, what to fix, and what to build next.\n\n\n\nWe're hiring a Senior Data Scientist to be the person who makes those numbers trustworthy and legible. You'll own the statistics: how we measure recovery and throughput, how we know a process change actually worked, how much of a swing is signal and how much is assay noise, and what the reporting layer says when an operator or an executive opens it.\n\n\n\nThis is not an ML modeling role and not a data engineering role. Our MLEs build the models and our data engineers move the data. You bring statistical rigor and clear reporting to a company generating more data than it currently knows how to interpret, and you make sure the conclusions people draw from it are the right ones.\n\n\n\n\nWHAT YOU'LL DO\n\n - Design and analyze plant trials and experiments — DOE, sample sizing, control selection, and the analysis that says whether a process change did what it was supposed to do and at what confidence.\n\n - Own the definitions of the metrics the business runs on: recovery, grade, throughput, yield, uptime, unit cost. Decide what each one means, make the definition consistent across teams, and defend it when someone wants to compute it differently.\n\n - Build and own the reporting and analytics layer — the recurring reporting, the dashboards, and the self-serve tooling that lets operators, engineers, and business leads answer their own questions.\n\n - Quantify uncertainty honestly: sampling error, assay variability, instrument drift, measurement system analysis.\n\n - Apply statistical process control and capability analysis to plant operations — know when a process has actually shifted versus when it's a normal excursion.\n\n - Run the deep-dive analyses that don't have a home: why last month's recovery dropped, what's driving cost variance, which of these three suppliers is actually better, whether this correlation is real.\n\n - Do forecasting and estimation for production, cost, and capacity planning — applied statistics that informs commitments, not research models.\n\n - Partner with the Technical Product Manager for Data & Analytics Platform on what the reporting and analytics stack needs next, and be a demanding internal customer of the data platform when the data isn't fit for purpose.\n\n - Raise the analytical bar across the company: review other people's analyses, catch the flawed comparison before it reaches a decision meeting, and teach the teams around you enough statistics to stop making the same mistake twice.\n\n - Write findings up so they're actually used — a clear memo a non-statistician can act on, not a notebook that needs you in the room.\n \n \n\n\nHOW YOU'LL OPERATE\n\n - Rigor with a deadline: You know the difference between the analysis worth another week and the one that's good enough to decide on today, and you say which is which.\n\n - Skeptical by default: You ask how the data was collected before you analyze it, and you're the person who notices the sensor was miscalibrated for three weeks.\n\n - Structure from ambiguity: Turn a vague business question into a well-posed statistical one, get the data you need, and own the answer end to end.\n\n - Explicit about confidence: Communicate uncertainty in a way that helps people decide, rather than hedging so heavily the analysis becomes useless.\n\n - Ecosystem fluency: Understand where your data comes from, what the models and simulators downstream do with it, and where the reporting layer sits relative to the platform underneath it.\n \n \n\n\nWHAT WE'RE LOOKING FOR\n\nMust have\n\n - 3–6+ years in data science, statistics, analytics, or a quantitative research role where you owned analyses that drove real decisions\n\n - Deep applied statistics: experimental design, hypothesis testing, regression, uncertainty quantification — and the judgment to know which tool fits the question and which assumption you just violated\n\n - Strong SQL and Python (pandas, statsmodels, scipy) — enough to get your own data, run your own analysis, and produce your own reporting without waiting on someone else\n\n - Track record building reporting and dashboards people actually use, with the product sense to know what belongs on a dashboard versus in a memo\n\n - Ability to work with messy, real-world measurement data — missing values, inconsistent sampling, instrument error — and be clear about what it can and can't support\n\n - Exceptional written communication; much of this job is making a technical finding land with operators, engineers, and executives\n\n - Comfort being the statistical authority in the room\n\nNice to have\n\n - Background in mining, metallurgy, chemicals, energy, manufacturing, or other heavy industry — especially metallurgical accounting, mass balance reconciliation, or sampling theory\n\n - Experience with statistical process control, or measurement system analysis\n\n - Experience with BI and analytics tooling (Hex, Looker, or embedded analytics) and an opinion about how to deploy them\n\n - Degree in statistics, chemical engineering, chemistry, operations research, economics, or a related quantitative field\n\n - Experience building an analytics function at a company where one didn't exist yet\n\n - Working fluency with LLM-assisted analysis and where it genuinely speeds up analytical work versus where it quietly introduces errors\n \n \n\n\nWHY THIS ROLE\n\nMost senior data scientist roles are one of two things: a modeling role wearing an analytics title, or a dashboard-request queue. This is neither. You own how a physical, capital-intensive business measures itself, at the moment those measurements move from spreadsheets and tribal knowledge into something supported and shared. At Mariana, you don't need to validate product-market fit, because we are the market: if you find something real in the data, the people who can act on it are down the hall.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $173K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $173K","compensationTiers":[{"id":"72cd5df0-82b6-484b-80ef-c487727e3cb4","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $140K – $173K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"0c660dc4-ed9d-49e9-98bc-5f6ca8ac3413","summary":"Estimated base salary ranges provided, but flexible based on experience. 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We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
As a Process & Lab Technician, you'll support safe, efficient and high-quality process development studies and analytical tests. You'll work closely with R&D and engineering to build, operate and maintain ore leaching columns, and you'll deliver timely, accurate and actionable chemical analysis of ore, process streams and final products. You'll play a critical role in bridging leaching research and lab analytics with plant operations, helping make sure processes are robust, efficient and ready for future development and scale-up. This is a hands-on production lab at a working mine, not a clean lab. Expect dust, noise, acid fumes and mud.
What You’ll Do
Drive ore handling including crushing, sorting by particle size, and taking representative samples
Prepare samples for analysis using techniques such as digestion, dilution, and/or filtration
Perform elemental and compositional analysis of solid and liquid samples using ICP, NMR, XRF, Titrator, or similar analytical techniques
Document analytical results in laboratory information systems and maintain clear experimental records and material metrics using digital tools and software
Follow strict environmental, health, and safety protocols
Desired Qualifications
Experience working in minerals processing, metallurgy, chemicals, specialty materials, or similar industrial environments
Familiarity with chemical processing (pumps, columns, instrumentation, etc) or crushing equipment (crushers, grinders, conveyors, sorters, etc)
Ability to read and follow SOPs, equipment manuals, and safety guidelines
Mechanical aptitude and ability to perform basic mechanical fabrication and troubleshooting
Hands-on experience operating analytical or similar equipment
Strong communication skills and willingness to collaborate across teams
Commitment to safety, accuracy, and operational excellence
Ability to lift up to 50 lbs and work on your feet for extended periods
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nAs a Process & Lab Technician, you'll support safe, efficient and high-quality process development studies and analytical tests. You'll work closely with R&D and engineering to build, operate and maintain ore leaching columns, and you'll deliver timely, accurate and actionable chemical analysis of ore, process streams and final products. You'll play a critical role in bridging leaching research and lab analytics with plant operations, helping make sure processes are robust, efficient and ready for future development and scale-up. This is a hands-on production lab at a working mine, not a clean lab. Expect dust, noise, acid fumes and mud.\n\n \n\nWhat You’ll Do\n\n - Drive ore handling including crushing, sorting by particle size, and taking representative samples\n\n - Prepare samples for analysis using techniques such as digestion, dilution, and/or filtration\n\n - Perform elemental and compositional analysis of solid and liquid samples using ICP, NMR, XRF, Titrator, or similar analytical techniques\n\n - Document analytical results in laboratory information systems and maintain clear experimental records and material metrics using digital tools and software\n\n - Follow strict environmental, health, and safety protocols\n \n \n\nDesired Qualifications\n\n - Experience working in minerals processing, metallurgy, chemicals, specialty materials, or similar industrial environments\n\n - Familiarity with chemical processing (pumps, columns, instrumentation, etc) or crushing equipment (crushers, grinders, conveyors, sorters, etc)\n\n - Ability to read and follow SOPs, equipment manuals, and safety guidelines\n\n - Mechanical aptitude and ability to perform basic mechanical fabrication and troubleshooting\n\n - Hands-on experience operating analytical or similar equipment\n\n - Strong communication skills and willingness to collaborate across teams\n\n - Commitment to safety, accuracy, and operational excellence\n\n - Ability to lift up to 50 lbs and work on your feet for extended periods\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"926ab762-e905-4b99-b4b2-e82ba42ee087","title":"Machine Learning Engineering Manager, Chemistry & Process Engineering","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-09-23T00:32:29.305+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/926ab762-e905-4b99-b4b2-e82ba42ee087","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/926ab762-e905-4b99-b4b2-e82ba42ee087/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our ML systems don't live in a vacuum — they learn from and run alongside chemistry and process simulators, and they increasingly inform, and set, how our plants and chemical processes operate.
We're hiring a Machine Learning Engineering Manager to lead the team of MLEs building models for chemistry and process engineering: surrogate and hybrid models of unit operations, models that learn from plant and lab data, and the optimization and control layers that turn those models into operating decisions. You'll manage the people, own the technical quality of what ships, and partner with the Technical Product Manager for ML & Robotics on what gets built and why.
This is a player-coach role. Today this work is done by strong individual MLEs with technical leads setting direction informally. Your job is to make it a team: hire the next several engineers, set the engineering and modeling bar, and give the TPM a counterpart who can say what is technically possible, how long it will take, and what it will cost in accuracy or risk.
Manage, coach, and grow a team of ML engineers working on chemistry and process problems — hiring, onboarding, 1:1s, performance reviews, career development, and the hard conversations when they're needed.
Own the technical direction of the team: model architectures, data strategy, validation methodology, and the standards for when a model is trusted enough to inform or set a process decision.
Partner with a TPM on the roadmap: translate product priorities into scoped engineering work, push back when the ask isn't feasible, and commit to what the team will deliver.
Work directly with process engineers, chemists, and operators to make sure the models the team builds answer the questions the plant actually has.
Set the bar for rigor in a domain where physics matters: mass and energy balances, thermodynamic consistency, extrapolation limits, uncertainty quantification, and the difference between a model that fits and a model that's right.
Own the production lifecycle of the team's models — deployment, monitoring, retraining, drift, and incident response — and the operational practices (on-call, runbooks, review) that keep them reliable.
Run the team's engineering practices: code and model review, experiment tracking, reproducibility, and documentation, so work survives the person who built it.
Stay hands-on enough to review the hardest work, unblock engineers, and prototype when the fastest path to an answer is to build it yourself.
Own headcount planning and hiring for the team, and build the pipeline of ML engineers with chemistry and process backgrounds.
Player-coach: You spend most of your time on people, priorities, and quality — and enough time in the code and the data to keep your judgment sharp.
Structure from ambiguity: Turn loosely defined process problems into scoped modeling work with clear success criteria, and align process engineers, MLEs, and product behind it.
Physics-literate skepticism: You know when a model is learning chemistry and when it's learning an artifact, and you hold the team to the former.
Clear commitments: Give the TPM and the business honest estimates, visible tradeoffs, and early warning when something is slipping.
Ecosystem fluency: Understand where the team's models sit relative to the simulators, the data platform, and the control systems that consume them, so nothing falls in the gap.
Must have
6+ years in machine learning or scientific computing, including 2+ years managing ML engineers or scientists with direct responsibility for hiring, performance, and growth.
Degree or equivalent depth in chemical engineering, chemistry, materials science, or a closely related field — you can read a process flow diagram, reason about reaction kinetics and separations, and hold your own with process engineers.
Hands-on track record shipping ML models to production for physical, scientific, or industrial systems: surrogate models, hybrid physics-ML models, time-series forecasting, Bayesian optimization, or similar.
Strong engineering fundamentals: Python, modern ML frameworks, experiment tracking, and the discipline to make research code reproducible and maintainable.
Track record of setting technical direction for a team and delivering against commitments in an ambiguous, cross-functional environment.
Ability to evaluate work you didn't do — you can review a model, spot the flaw in a validation approach, and give feedback that makes the engineer better.
Exceptional written and verbal communication across audiences, from ML engineers to process engineers to operators to executives.
Nice to have
PhD in chemical engineering, chemistry, or materials science with an ML or computational focus.
Experience with model predictive control, real-time optimization, or other closed-loop optimization of chemical or industrial processes.
Background in mining, hydrometallurgy, energy, chemicals, or other heavy industry.
Experience building a team from a handful of engineers to a functioning organization.
Most ML manager roles hand you a mature team and a model with a defined scope. This role hands you the models that will increasingly run our chemistry and process operations, a team that's ready to be built, and a company where the plant is down the hall. At Mariana, you don't need to validate product-market fit, because we are the market: if your team builds a model that makes the process run better, it goes into the process.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our ML systems don't live in a vacuum — they learn from and run alongside chemistry and process simulators, and they increasingly inform, and set, how our plants and chemical processes operate.\n\nWe're hiring a Machine Learning Engineering Manager to lead the team of MLEs building models for chemistry and process engineering: surrogate and hybrid models of unit operations, models that learn from plant and lab data, and the optimization and control layers that turn those models into operating decisions. You'll manage the people, own the technical quality of what ships, and partner with the Technical Product Manager for ML & Robotics on what gets built and why.\n\nThis is a player-coach role. Today this work is done by strong individual MLEs with technical leads setting direction informally. Your job is to make it a team: hire the next several engineers, set the engineering and modeling bar, and give the TPM a counterpart who can say what is technically possible, how long it will take, and what it will cost in accuracy or risk.\n\n\n\n\nWHAT YOU'LL DO\n\n - Manage, coach, and grow a team of ML engineers working on chemistry and process problems — hiring, onboarding, 1:1s, performance reviews, career development, and the hard conversations when they're needed.\n\n - Own the technical direction of the team: model architectures, data strategy, validation methodology, and the standards for when a model is trusted enough to inform or set a process decision.\n\n - Partner with a TPM on the roadmap: translate product priorities into scoped engineering work, push back when the ask isn't feasible, and commit to what the team will deliver.\n\n - Work directly with process engineers, chemists, and operators to make sure the models the team builds answer the questions the plant actually has.\n\n - Set the bar for rigor in a domain where physics matters: mass and energy balances, thermodynamic consistency, extrapolation limits, uncertainty quantification, and the difference between a model that fits and a model that's right.\n\n - Own the production lifecycle of the team's models — deployment, monitoring, retraining, drift, and incident response — and the operational practices (on-call, runbooks, review) that keep them reliable.\n\n - Run the team's engineering practices: code and model review, experiment tracking, reproducibility, and documentation, so work survives the person who built it.\n\n - Stay hands-on enough to review the hardest work, unblock engineers, and prototype when the fastest path to an answer is to build it yourself.\n\n - Own headcount planning and hiring for the team, and build the pipeline of ML engineers with chemistry and process backgrounds.\n \n \n\n\nHOW YOU'LL OPERATE\n\n - Player-coach: You spend most of your time on people, priorities, and quality — and enough time in the code and the data to keep your judgment sharp.\n\n - Structure from ambiguity: Turn loosely defined process problems into scoped modeling work with clear success criteria, and align process engineers, MLEs, and product behind it.\n\n - Physics-literate skepticism: You know when a model is learning chemistry and when it's learning an artifact, and you hold the team to the former.\n\n - Clear commitments: Give the TPM and the business honest estimates, visible tradeoffs, and early warning when something is slipping.\n\n - Ecosystem fluency: Understand where the team's models sit relative to the simulators, the data platform, and the control systems that consume them, so nothing falls in the gap.\n \n \n\n\nWHAT WE'RE LOOKING FOR\n\nMust have\n\n - 6+ years in machine learning or scientific computing, including 2+ years managing ML engineers or scientists with direct responsibility for hiring, performance, and growth.\n\n - Degree or equivalent depth in chemical engineering, chemistry, materials science, or a closely related field — you can read a process flow diagram, reason about reaction kinetics and separations, and hold your own with process engineers.\n\n - Hands-on track record shipping ML models to production for physical, scientific, or industrial systems: surrogate models, hybrid physics-ML models, time-series forecasting, Bayesian optimization, or similar.\n\n - Strong engineering fundamentals: Python, modern ML frameworks, experiment tracking, and the discipline to make research code reproducible and maintainable.\n\n - Track record of setting technical direction for a team and delivering against commitments in an ambiguous, cross-functional environment.\n\n - Ability to evaluate work you didn't do — you can review a model, spot the flaw in a validation approach, and give feedback that makes the engineer better.\n\n - Exceptional written and verbal communication across audiences, from ML engineers to process engineers to operators to executives.\n\nNice to have\n\n - PhD in chemical engineering, chemistry, or materials science with an ML or computational focus.\n\n - Experience with model predictive control, real-time optimization, or other closed-loop optimization of chemical or industrial processes.\n\n - Background in mining, hydrometallurgy, energy, chemicals, or other heavy industry.\n\n - Experience building a team from a handful of engineers to a functioning organization.\n \n \n\n\nWHY THIS ROLE\n\nMost ML manager roles hand you a mature team and a model with a defined scope. This role hands you the models that will increasingly run our chemistry and process operations, a team that's ready to be built, and a company where the plant is down the hall. At Mariana, you don't need to validate product-market fit, because we are the market: if your team builds a model that makes the process run better, it goes into the process.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$176K – $212K • Offers Equity","scrapeableCompensationSalarySummary":"$176K - $212K","compensationTiers":[{"id":"cc189164-6095-44e4-b367-6005b9c9009f","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $176K – $212K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"a9883f9d-7e63-4d0c-a070-87ce6376e4b1","summary":"Estimated base salary ranges provided, but flexible based on experience. 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We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our ML systems don't live in a vacuum — they see and act in our plants through sensors and robotic systems, they run as agents inside the tools the business uses every day, and they run on an ML platform that has to serve all of it.
We're hiring a Machine Learning Engineering Manager to lead the MLEs working on everything outside the chemistry and process models: perception and vision, sensor and robotics initiatives, LLM-powered and agentic workflows, and the ML platform and MLOps infrastructure the whole applied AI/ML organization depends on. You'll manage the people, own the technical quality of what ships, and partner with both Technical Product Managers — ML & Robotics, and Data & Analytics Platform — on what gets built and why.
This is a player-coach role with a wide surface area. The problems range from a camera on a conveyor to an agent answering an operator's question to the training and deployment infrastructure underneath both. Your job is to build a team of strong generalists, keep the platform coherent as the use cases multiply, and give the TPMs a counterpart who can say what is technically possible and what it will take.
What You'll Do
Manage, coach, and grow a team of ML engineers across perception, robotics, agentic workflows, and ML platform — hiring, onboarding, 1:1s, performance reviews, career development, and the hard conversations when they're needed.
Own the technical direction of the team: which approaches to bet on, how the platform is architected, and what \"good enough to deploy\" means for a vision model, a robot, or an agent.
Partner with TPMs on the roadmap: translate product priorities into scoped engineering work, push back when the ask isn't feasible, and commit to what the team will deliver.
Own the ML platform and MLOps stack as a product the rest of the ML org uses: training infrastructure, evaluation, deployment, monitoring, and the paved road that lets every MLE ship faster.
Own the engineering practices for perception and robotics: data collection and labeling, evaluation on real plant conditions, safety and fallback behavior, and the path from a demo to a system operators trust.
Own the engineering practices for LLM and agentic tools: evaluation, guardrails, cost, latency, and the discipline to know when an agent is the right answer and when conventional software is.
Own the seam with the software engineering organization at the engineering level — shared infrastructure, interfaces, and ownership — so nothing falls in the gap between the two orgs.
Own the production lifecycle of the team's systems — deployment, monitoring, incident response, on-call — and the reliability bar for systems that act in a plant.
Stay hands-on enough to review the hardest work, unblock engineers, and prototype when the fastest path to an answer is to build it yourself.
Own headcount planning and hiring for the team, and build a pipeline of ML engineers who can move between problem areas.
How You'll Operate
Player-coach: You spend most of your time on people, priorities, and quality — and enough time in the code and the systems to keep your judgment sharp.
Structure from ambiguity: Turn a loosely defined plant problem or internal-tool idea into scoped engineering work with clear success criteria, and align operators, MLEs, software engineers, and product behind it.
Breadth with depth on demand: You're credible across perception, LLMs, and infrastructure, and you know when a problem needs a specialist.
Clear commitments: Give the TPMs and the business honest estimates, visible tradeoffs, and early warning when something is slipping.
Ecosystem fluency: Understand the Mariana ML, perception, robotics, and data ecosystem as a whole — and where it sits relative to the current frontier of model capability — so the team's bets stay well-calibrated.
What We're Looking For
Must have
6+ years in machine learning engineering, including 2+ years managing ML engineers with direct responsibility for hiring, performance, and growth.
Hands-on track record shipping ML systems to production in at least two of: computer vision / perception, robotics or embedded ML, LLM-powered or agentic applications, ML platform / MLOps infrastructure.
Strong software engineering fundamentals: you've built and operated production systems, you care about interfaces and reliability, and you can hold a design review with software engineers as a peer.
Working fluency with the current LLM/foundation-model landscape — what the models can do today, how to evaluate them, and where agentic approaches genuinely fit versus conventional software.
Track record of setting technical direction for a team and delivering against commitments in an ambiguous, cross-functional environment.
Ability to evaluate work you didn't do — you can review a model, a pipeline, or a system design and give feedback that makes the engineer better.
Exceptional written and verbal communication across audiences, from ML engineers to operators to executives.
Nice to have
Prior work on industrial robotics, perception in harsh environments, or closed-loop control of physical systems.
Experience owning an ML platform or MLOps stack used by multiple teams.
Experience shipping LLM-powered or agentic internal tools to real users and measuring adoption.
Background in mining, energy, chemicals, manufacturing, or other heavy industry — especially industrial automation or sensor/vision data.
Experience building a team from a handful of engineers to a functioning organization.
Why This Role
Most ML manager roles hand you one problem area and a platform someone else owns. This role hands you the perception systems that will see our plants, the robotic systems that will act in them, the agents that will run inside our tools, and the platform underneath all of it — at the moment they move from ad hoc experimentation into supported systems. At Mariana, you don't need to validate product-market fit, because we are the market: if your team builds something that works, it gets deployed.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nMariana Minerals is a software-first, vertically integrated minerals company supplying the minerals critical to modern energy, AI, and defense technologies. Our ML systems don't live in a vacuum — they see and act in our plants through sensors and robotic systems, they run as agents inside the tools the business uses every day, and they run on an ML platform that has to serve all of it.\n\nWe're hiring a Machine Learning Engineering Manager to lead the MLEs working on everything outside the chemistry and process models: perception and vision, sensor and robotics initiatives, LLM-powered and agentic workflows, and the ML platform and MLOps infrastructure the whole applied AI/ML organization depends on. You'll manage the people, own the technical quality of what ships, and partner with both Technical Product Managers — ML & Robotics, and Data & Analytics Platform — on what gets built and why.\n\nThis is a player-coach role with a wide surface area. The problems range from a camera on a conveyor to an agent answering an operator's question to the training and deployment infrastructure underneath both. Your job is to build a team of strong generalists, keep the platform coherent as the use cases multiply, and give the TPMs a counterpart who can say what is technically possible and what it will take.\n\n\n\nWhat You'll Do\n\n - Manage, coach, and grow a team of ML engineers across perception, robotics, agentic workflows, and ML platform — hiring, onboarding, 1:1s, performance reviews, career development, and the hard conversations when they're needed.\n\n - Own the technical direction of the team: which approaches to bet on, how the platform is architected, and what \"good enough to deploy\" means for a vision model, a robot, or an agent.\n\n - Partner with TPMs on the roadmap: translate product priorities into scoped engineering work, push back when the ask isn't feasible, and commit to what the team will deliver.\n\n - Own the ML platform and MLOps stack as a product the rest of the ML org uses: training infrastructure, evaluation, deployment, monitoring, and the paved road that lets every MLE ship faster.\n\n - Own the engineering practices for perception and robotics: data collection and labeling, evaluation on real plant conditions, safety and fallback behavior, and the path from a demo to a system operators trust.\n\n - Own the engineering practices for LLM and agentic tools: evaluation, guardrails, cost, latency, and the discipline to know when an agent is the right answer and when conventional software is.\n\n - Own the seam with the software engineering organization at the engineering level — shared infrastructure, interfaces, and ownership — so nothing falls in the gap between the two orgs.\n\n - Own the production lifecycle of the team's systems — deployment, monitoring, incident response, on-call — and the reliability bar for systems that act in a plant.\n\n - Stay hands-on enough to review the hardest work, unblock engineers, and prototype when the fastest path to an answer is to build it yourself.\n\n - Own headcount planning and hiring for the team, and build a pipeline of ML engineers who can move between problem areas.\n\nHow You'll Operate\n\n - Player-coach: You spend most of your time on people, priorities, and quality — and enough time in the code and the systems to keep your judgment sharp.\n\n - Structure from ambiguity: Turn a loosely defined plant problem or internal-tool idea into scoped engineering work with clear success criteria, and align operators, MLEs, software engineers, and product behind it.\n\n - Breadth with depth on demand: You're credible across perception, LLMs, and infrastructure, and you know when a problem needs a specialist.\n\n - Clear commitments: Give the TPMs and the business honest estimates, visible tradeoffs, and early warning when something is slipping.\n\n - Ecosystem fluency: Understand the Mariana ML, perception, robotics, and data ecosystem as a whole — and where it sits relative to the current frontier of model capability — so the team's bets stay well-calibrated.\n\nWhat We're Looking For\n\nMust have\n\n - 6+ years in machine learning engineering, including 2+ years managing ML engineers with direct responsibility for hiring, performance, and growth.\n\n - Hands-on track record shipping ML systems to production in at least two of: computer vision / perception, robotics or embedded ML, LLM-powered or agentic applications, ML platform / MLOps infrastructure.\n\n - Strong software engineering fundamentals: you've built and operated production systems, you care about interfaces and reliability, and you can hold a design review with software engineers as a peer.\n\n - Working fluency with the current LLM/foundation-model landscape — what the models can do today, how to evaluate them, and where agentic approaches genuinely fit versus conventional software.\n\n - Track record of setting technical direction for a team and delivering against commitments in an ambiguous, cross-functional environment.\n\n - Ability to evaluate work you didn't do — you can review a model, a pipeline, or a system design and give feedback that makes the engineer better.\n\n - Exceptional written and verbal communication across audiences, from ML engineers to operators to executives.\n\nNice to have\n\n - Prior work on industrial robotics, perception in harsh environments, or closed-loop control of physical systems.\n\n - Experience owning an ML platform or MLOps stack used by multiple teams.\n\n - Experience shipping LLM-powered or agentic internal tools to real users and measuring adoption.\n\n - Background in mining, energy, chemicals, manufacturing, or other heavy industry — especially industrial automation or sensor/vision data.\n\n - Experience building a team from a handful of engineers to a functioning organization.\n\nWhy This Role\n\nMost ML manager roles hand you one problem area and a platform someone else owns. This role hands you the perception systems that will see our plants, the robotic systems that will act in them, the agents that will run inside our tools, and the platform underneath all of it — at the moment they move from ad hoc experimentation into supported systems. At Mariana, you don't need to validate product-market fit, because we are the market: if your team builds something that works, it gets deployed.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$176K – $212K • Offers Equity","scrapeableCompensationSalarySummary":"$176K - $212K","compensationTiers":[{"id":"c57d9d90-e40c-4848-b7c3-a2f329898585","tierSummary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $176K – $212K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"fa7af0c7-98b2-4939-84d8-7ee502fa0d1c","summary":"Estimated base salary ranges provided, but flexible based on experience. Final salary based on experience, location, and other factors. $176K – $212K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":176000,"maxValue":212000},{"id":"324d54b5-114e-4913-aef8-61ad8792e284","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":176000,"maxValue":212000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"0c2e3425-1f0e-41c8-b5f1-c3a8a0cbf933","title":"Member of the Special Projects Staff","department":"Special Projects","team":"Special Projects","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-09-30T00:59:33.608+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/0c2e3425-1f0e-41c8-b5f1-c3a8a0cbf933","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/0c2e3425-1f0e-41c8-b5f1-c3a8a0cbf933/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Special Projects is a high-agency problem-solving team at Mariana, empowered by leadership to solve the company’s most critical and least defined problems. In any organization, there are high-leverage, ambiguous problems that either fall between organizational structures or have proven intractable within a team. Special Projects solves these problems by embedding quickly, using first-principles thinking to decomp problems, leading cross-functional execution, and iterating rapidly toward a solution before moving on to the next challenge. It is a dynamic, high-ownership, low-ego team that requires seasoned, independent problem-solvers. Problem spaces include but are not limited to: engineering, operations, software development, new project development, finance, brand, and more.
We are calling all ambitious, eccentric generalists who want to build a generational company.
Own critical, ambiguous problems end-to-end: take on discrete problems with diverse stakeholders and drive to defined outcomes with high visibility within the company.
Build and lead teams you won't manage: assemble the right people from across the company for each project, set a pace, and bring them along. If your effectiveness has historically depended on org-chart authority, this will be a difficult role.
Build systems that outlast the project: deliver iterative working solutions while creating the processes so the project succeeds on its own. This is very much a hands-on builder role.
Communicate relentlessly and plainly: up and down the chain, set strategic direction and build consensus.
Execute with judgment: make real decisions in leadership's absence consistent with the company’s strategy; identify and scope special projects for the team.
High agency: you have a strong bias for action. You are willing to push, experiment, and act without waiting for instructions.
Low ego: you are more interested in the problem being solved than in being seen solving it.
High EQ: you understand people intuitively and know how to get the best out of them.
Magnetic: people are drawn to working with you.
Curious: you want to know how the block model is built, how a refinery works, where sorbent comes from, how legal contracts are structured, why we care about accruals, how best to do a retro, why the model says what it says, and so on.
Comfortable with ambiguity: you are not scared of endless shades of grey.
Direct: you speak and write plainly and clearly.
Composed: as the old special operations adage goes, be a duck. You are calm under pressure.
Quick study: you get to working literacy in unfamiliar technical or commercial domains quickly while maintaining humility.
Gritty: you are excited by the opportunity to work through gnarly problems.
5-8+ years in roles that demanded ownership of undefined problems: engineering, operations, consulting, banking, construction, founder or early-employee at a startup, military service, or comparable. Preference for those who have operated at high-growth startups.
Demonstrated ability to deliver results through people who do not report to you.
Exceptional written and verbal communication.
Willingness to engage seriously with both technical and commercial material (mining/process engineering, construction, contract structure, financial modeling, software, robotics, autonomy architecture). Depth in any one of these areas is a plus, but genuine interest in all is a requirement.
Willingness to travel to our mines and refineries (Moab, UT; East Texas; potential international operations); 25-50% but subject to change.
No mining experience required, but industrial, technology, construction, aerospace, and/or manufacturing experience is a plus.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE \n\nSpecial Projects is a high-agency problem-solving team at Mariana, empowered by leadership to solve the company’s most critical and least defined problems. In any organization, there are high-leverage, ambiguous problems that either fall between organizational structures or have proven intractable within a team. Special Projects solves these problems by embedding quickly, using first-principles thinking to decomp problems, leading cross-functional execution, and iterating rapidly toward a solution before moving on to the next challenge. It is a dynamic, high-ownership, low-ego team that requires seasoned, independent problem-solvers. Problem spaces include but are not limited to: engineering, operations, software development, new project development, finance, brand, and more. \n\nWe are calling all ambitious, eccentric generalists who want to build a generational company. \n\n\n\n\nWHAT YOU'LL DO \n\n - Own critical, ambiguous problems end-to-end: take on discrete problems with diverse stakeholders and drive to defined outcomes with high visibility within the company.\n\n - Build and lead teams you won't manage: assemble the right people from across the company for each project, set a pace, and bring them along. If your effectiveness has historically depended on org-chart authority, this will be a difficult role. \n\n - Build systems that outlast the project: deliver iterative working solutions while creating the processes so the project succeeds on its own. This is very much a hands-on builder role. \n\n - Communicate relentlessly and plainly: up and down the chain, set strategic direction and build consensus. \n\n - Execute with judgment: make real decisions in leadership's absence consistent with the company’s strategy; identify and scope special projects for the team. \n\n \n\n\nWHO YOU ARE \n\n - High agency: you have a strong bias for action. You are willing to push, experiment, and act without waiting for instructions. \n\n - Low ego: you are more interested in the problem being solved than in being seen solving it. \n\n - High EQ: you understand people intuitively and know how to get the best out of them. \n\n - Magnetic: people are drawn to working with you. \n\n - Curious: you want to know how the block model is built, how a refinery works, where sorbent comes from, how legal contracts are structured, why we care about accruals, how best to do a retro, why the model says what it says, and so on. \n\n - Comfortable with ambiguity: you are not scared of endless shades of grey. \n\n - Direct: you speak and write plainly and clearly. \n\n - Composed: as the old special operations adage goes, be a duck. You are calm under pressure. \n\n - Quick study: you get to working literacy in unfamiliar technical or commercial domains quickly while maintaining humility. \n\n - Gritty: you are excited by the opportunity to work through gnarly problems. \n\n\n QUALIFICATIONS \n\n - 5-8+ years in roles that demanded ownership of undefined problems: engineering, operations, consulting, banking, construction, founder or early-employee at a startup, military service, or comparable. Preference for those who have operated at high-growth startups. \n\n - Demonstrated ability to deliver results through people who do not report to you. \n\n - Exceptional written and verbal communication. \n\n - Willingness to engage seriously with both technical and commercial material (mining/process engineering, construction, contract structure, financial modeling, software, robotics, autonomy architecture). Depth in any one of these areas is a plus, but genuine interest in all is a requirement. \n\n - Willingness to travel to our mines and refineries (Moab, UT; East Texas; potential international operations); 25-50% but subject to change. \n\n - No mining experience required, but industrial, technology, construction, aerospace, and/or manufacturing experience is a plus. \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$170K – $185K • Offers Equity","scrapeableCompensationSalarySummary":"$170K - $185K","compensationTiers":[{"id":"b36272d6-4fd2-4534-8cc9-9cf3e08b0dc0","tierSummary":"$170K – $185K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"8dccf253-28ae-4de3-9022-c1f4f423ace3","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"id":"bacc1992-fd66-4948-bff8-39cfe2af9f5d","summary":"$170K – $185K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":170000,"maxValue":185000}]}],"summaryComponents":[{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":170000,"maxValue":185000}]}},{"id":"7a54d186-57cc-4a2b-a33f-62af27e35eff","title":"Staff Mobile Equipment and Fleet Engineer","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-09-29T11:08:23.849+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/7a54d186-57cc-4a2b-a33f-62af27e35eff","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/7a54d186-57cc-4a2b-a33f-62af27e35eff/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is seeking a Mobile Equipment and Fleet Engineer to build and optimize the equipment fleet for our open pit mining operations. You will own the technical specifications, equipment and OEM selection, and full lifecycle economics of production and support equipment. Autonomy is a central part of the role: you will help determine which equipment should operate without an onboard operator, how to achieve that through new purchases or retrofits, and how to integrate autonomous machines into a productive mine.
Your scope includes haul trucks, wheel loaders, excavators, dozers, graders, water trucks, blast-hole drills, blasting support equipment, RC and core drilling rigs, trailers, and other mobile equipment. You will work across operations, maintenance, mine engineering, procurement, OEMs, autonomy providers, and Mariana’s software team.
What You'll Do
Fleet selection and autonomy
Design the fleet. Translate mine plans, production targets, haul profiles, ground conditions, road geometry, operating hours, and site constraints into fleet requirements. Match loading, hauling, drilling, and support equipment so the fleet performs as an integrated system.
Specify and select equipment. Develop technical specifications and compare machine classes, models, powertrains, configurations, and OEMs. Evaluate payload, cycle time, availability, maintainability, parts and dealer support, interoperability, and readiness for remote or autonomous operation.
Drive the autonomy roadmap. Identify where autonomous haulage, loading, drilling, and support equipment can create practical value. Compare purpose-built autonomous machines with retrofit options, including whether and when removing the onboard operator makes technical, operational, and economic sense.
Engineer autonomous integration. Work with OEMs, autonomy vendors, site teams, and software developers on machine controls, sensors, communications, fleet coordination, remote supervision and intervention, and interfaces with dispatch and maintenance systems. Define acceptance tests and support safe commissioning.
Make autonomy work in the field. Plan for interactions among autonomous trucks, loaders, drills, manually operated equipment, and people. Evaluate the effect of autonomy on haul roads, loading areas, traffic rules, fueling and servicing, recovery procedures, productivity, and staffing.
Lifecycle performance and data
Own lifecycle economics. Build and maintain models for acquisition, fuel and energy, tires, maintenance, major components, rebuilds, autonomy conversion, replacement, and residual value. Use cost per tonne and project value to guide purchase and replacement decisions.
Improve equipment life and performance. Partner with operations and maintenance to address downtime, underutilization, payload losses, inefficient operation, and premature wear. Use condition monitoring and operating data to improve maintenance plans, equipment use, and rebuild timing.
Build with data and software. Define telemetry and data collection needs, connect equipment and maintenance information, and work with the MarianaOS team to develop tools for fleet selection, equipment health, utilization, autonomous performance, and continuous optimization.
Guide OEM and vendor choices. Assess technical capability, autonomy offerings, integration flexibility, service coverage, parts availability, and long-term support. Stay current with advances in engines, powertrains, controls, and mining automation.
What You'll Bring
Relevant experience. A background in mobile equipment engineering, fleet management, equipment maintenance, OEM applications, or technology integration in open pit mining or a similar heavy-equipment environment.
Equipment knowledge. Practical understanding of machine performance and the mechanical, hydraulic, electrical, and control systems that determine reliability, maintainability, and operating life.
Autonomy knowledge. Experience with autonomous or remotely operated equipment, machine controls, or equipment retrofits; and sound judgment about the realities of deployment in an active operation.
Analytical judgment. Ability to develop fleet and lifecycle cost analyses, investigate equipment data, test assumptions, and make clear recommendations that balance cost, performance, safety, and flexibility.
Collaborative drive. Strong communication skills and enthusiasm for working with operators, maintainers, engineers, and software developers in a dynamic, multidisciplinary setting.
Curiosity and initiative. A genuine passion for equipment and engines, an interest in new technology, and the creativity to turn promising ideas into improvements that work in the field.
What Success Looks Like
Mariana has a fleet selected for the actual requirements of each operation, with clear specifications and defensible lifecycle costs. Autonomous equipment is deployed where it improves the operation, with proven integration into the broader fleet. Equipment data informs daily performance improvements and future fleet decisions.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nMariana Minerals is seeking a Mobile Equipment and Fleet Engineer to build and optimize the equipment fleet for our open pit mining operations. You will own the technical specifications, equipment and OEM selection, and full lifecycle economics of production and support equipment. Autonomy is a central part of the role: you will help determine which equipment should operate without an onboard operator, how to achieve that through new purchases or retrofits, and how to integrate autonomous machines into a productive mine. \n\nYour scope includes haul trucks, wheel loaders, excavators, dozers, graders, water trucks, blast-hole drills, blasting support equipment, RC and core drilling rigs, trailers, and other mobile equipment. You will work across operations, maintenance, mine engineering, procurement, OEMs, autonomy providers, and Mariana’s software team.\n\n \n\nWhat You'll Do\n\n - Fleet selection and autonomy\n \n - Design the fleet. Translate mine plans, production targets, haul profiles, ground conditions, road geometry, operating hours, and site constraints into fleet requirements. Match loading, hauling, drilling, and support equipment so the fleet performs as an integrated system.\n \n - Specify and select equipment. Develop technical specifications and compare machine classes, models, powertrains, configurations, and OEMs. Evaluate payload, cycle time, availability, maintainability, parts and dealer support, interoperability, and readiness for remote or autonomous operation.\n \n - Drive the autonomy roadmap. Identify where autonomous haulage, loading, drilling, and support equipment can create practical value. Compare purpose-built autonomous machines with retrofit options, including whether and when removing the onboard operator makes technical, operational, and economic sense.\n \n - Engineer autonomous integration. Work with OEMs, autonomy vendors, site teams, and software developers on machine controls, sensors, communications, fleet coordination, remote supervision and intervention, and interfaces with dispatch and maintenance systems. Define acceptance tests and support safe commissioning.\n \n - Make autonomy work in the field. Plan for interactions among autonomous trucks, loaders, drills, manually operated equipment, and people. Evaluate the effect of autonomy on haul roads, loading areas, traffic rules, fueling and servicing, recovery procedures, productivity, and staffing.\n\n - Lifecycle performance and data\n \n - Own lifecycle economics. Build and maintain models for acquisition, fuel and energy, tires, maintenance, major components, rebuilds, autonomy conversion, replacement, and residual value. Use cost per tonne and project value to guide purchase and replacement decisions.\n \n - Improve equipment life and performance. Partner with operations and maintenance to address downtime, underutilization, payload losses, inefficient operation, and premature wear. Use condition monitoring and operating data to improve maintenance plans, equipment use, and rebuild timing.\n \n - Build with data and software. Define telemetry and data collection needs, connect equipment and maintenance information, and work with the MarianaOS team to develop tools for fleet selection, equipment health, utilization, autonomous performance, and continuous optimization.\n \n - Guide OEM and vendor choices. Assess technical capability, autonomy offerings, integration flexibility, service coverage, parts availability, and long-term support. Stay current with advances in engines, powertrains, controls, and mining automation.\n\n \n\nWhat You'll Bring\n\n - Relevant experience. A background in mobile equipment engineering, fleet management, equipment maintenance, OEM applications, or technology integration in open pit mining or a similar heavy-equipment environment.\n\n - Equipment knowledge. Practical understanding of machine performance and the mechanical, hydraulic, electrical, and control systems that determine reliability, maintainability, and operating life.\n\n - Autonomy knowledge. Experience with autonomous or remotely operated equipment, machine controls, or equipment retrofits; and sound judgment about the realities of deployment in an active operation.\n\n - Analytical judgment. Ability to develop fleet and lifecycle cost analyses, investigate equipment data, test assumptions, and make clear recommendations that balance cost, performance, safety, and flexibility.\n\n - Collaborative drive. Strong communication skills and enthusiasm for working with operators, maintainers, engineers, and software developers in a dynamic, multidisciplinary setting.\n\n - Curiosity and initiative. A genuine passion for equipment and engines, an interest in new technology, and the creativity to turn promising ideas into improvements that work in the field.\n\n \n\nWhat Success Looks Like\n\nMariana has a fleet selected for the actual requirements of each operation, with clear specifications and defensible lifecycle costs. Autonomous equipment is deployed where it improves the operation, with proven integration into the broader fleet. Equipment data informs daily performance improvements and future fleet decisions.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"d2e7f02a-ae6d-4989-84e7-aae702f0c8b9","title":"Sr/Staff Civil Engineer","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}}],"publishedAt":"2026-09-30T23:33:14.011+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/d2e7f02a-ae6d-4989-84e7-aae702f0c8b9","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/d2e7f02a-ae6d-4989-84e7-aae702f0c8b9/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
As a Civil Engineer at Mariana Minerals, you will act as the owner’s engineer for civil and site development scope on greenfield mining and metallurgical processing facilities, defining requirements for engineering contractors and making sure their designs are integrated, constructible, and delivered on schedule and budget. You will also serve as engineer of record for civil packages designed in-house, sealing drawings and calculations once licensed and supporting them through construction.
What You’ll Do
Represent Mariana as the owner’s engineer for civil and site development scope, from site selection and feasibility through detailed design and construction.
Work with designers to develop site concepts in Civil 3D, including site layouts, grading and drainage strategies, access roads, and utility corridors.
Define civil design requirements for engineering contractors, including scope of work, design basis, specifications, deliverable lists, and CAD and modeling standards.
Manage contractor civil design activities from concept through issued-for-construction (IFC), tracking progress, hours, and deliverables against schedule and budget.
Lead design reviews with contractors, construction, and operations, and drive resolution of review comments, clashes, and constructability issues.
Review contractor deliverables, including grading, drainage, stormwater, roadway, and utility drawings, calculations, and quantity take-offs, for quality and compliance with project specifications and local codes.
Respond to contractor technical queries, and evaluate and approve design changes.
Manage geotechnical, survey, and environmental consultants, and make sure their findings are carried into the design.
Coordinate civil interfaces across process, mechanical, structural, electrical, and geotechnical engineering, and across contractor scope boundaries.
Support procurement by writing scopes of work, evaluating contractor proposals, and reviewing bids and submittals.
Support construction by performing field inspections, resolving RFIs and field changes, and verifying as-built surveys.
Once licensed, seve as engineer of record for civil packages designed in-house, including grading, drainage, stormwater, roadway, and utility design.
Perform and check civil design calculations, including earthwork, hydrology and hydraulics, pavement design, and utility sizing, and direct the designers producing the drawings.
Develop Mariana’s civil design standards, standard details, and work processes so they can be reused across projects.
Actively engage in development of Mariana’s internal software tools.
What You’ll Bring
Bachelor’s degree in civil engineering.
10+ years of civil and site development engineering experience on industrial, mining, or infrastructure projects.
Experience managing or reviewing the work of engineering contractors and consultants on an owner’s team, or leading civil scope on EPC projects that interface with owner’s teams.
Engineer in Training (EIT) certification.
Experience producing civil design packages for issue under an engineer of record.
Experience delivering greenfield capital projects from feasibility through detailed design and construction.
Strong technical knowledge of site grading, drainage design, stormwater management, earthwork optimization, and roadway design.
Working knowledge of utility design, geotechnical reports, and permitting requirements for industrial sites.
Strong communication skills and the ability to hold contractors accountable for quality, schedule, and budget.
Ability to work effectively with cross-functional teams, manage competing priorities, and support delivery of high-quality engineering packages under schedule constraints.
Preferred
Professional Engineer (PE) license in civil engineering, or the ability to obtain one within 12 months.
Experience with mining, mineral processing, chemical, or heavy industrial facilities.
Experience developing software tools or automating design workflows.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\n\nAs a Civil Engineer at Mariana Minerals, you will act as the owner’s engineer for civil and site development scope on greenfield mining and metallurgical processing facilities, defining requirements for engineering contractors and making sure their designs are integrated, constructible, and delivered on schedule and budget. You will also serve as engineer of record for civil packages designed in-house, sealing drawings and calculations once licensed and supporting them through construction.\n\n\n\nWhat You’ll Do\n\n - Represent Mariana as the owner’s engineer for civil and site development scope, from site selection and feasibility through detailed design and construction.\n\n - Work with designers to develop site concepts in Civil 3D, including site layouts, grading and drainage strategies, access roads, and utility corridors.\n\n - Define civil design requirements for engineering contractors, including scope of work, design basis, specifications, deliverable lists, and CAD and modeling standards.\n\n - Manage contractor civil design activities from concept through issued-for-construction (IFC), tracking progress, hours, and deliverables against schedule and budget.\n\n - Lead design reviews with contractors, construction, and operations, and drive resolution of review comments, clashes, and constructability issues.\n\n - Review contractor deliverables, including grading, drainage, stormwater, roadway, and utility drawings, calculations, and quantity take-offs, for quality and compliance with project specifications and local codes.\n\n - Respond to contractor technical queries, and evaluate and approve design changes.\n\n - Manage geotechnical, survey, and environmental consultants, and make sure their findings are carried into the design.\n\n - Coordinate civil interfaces across process, mechanical, structural, electrical, and geotechnical engineering, and across contractor scope boundaries.\n\n - Support procurement by writing scopes of work, evaluating contractor proposals, and reviewing bids and submittals.\n\n - Support construction by performing field inspections, resolving RFIs and field changes, and verifying as-built surveys.\n\n - Once licensed, seve as engineer of record for civil packages designed in-house, including grading, drainage, stormwater, roadway, and utility design.\n\n - Perform and check civil design calculations, including earthwork, hydrology and hydraulics, pavement design, and utility sizing, and direct the designers producing the drawings.\n\n - Develop Mariana’s civil design standards, standard details, and work processes so they can be reused across projects.\n\n - Actively engage in development of Mariana’s internal software tools.\n\n\n\nWhat You’ll Bring\n\n - Bachelor’s degree in civil engineering.\n\n - 10+ years of civil and site development engineering experience on industrial, mining, or infrastructure projects.\n\n - Experience managing or reviewing the work of engineering contractors and consultants on an owner’s team, or leading civil scope on EPC projects that interface with owner’s teams.\n\n - Engineer in Training (EIT) certification.\n\n - Experience producing civil design packages for issue under an engineer of record.\n\n - Experience delivering greenfield capital projects from feasibility through detailed design and construction.\n\n - Strong technical knowledge of site grading, drainage design, stormwater management, earthwork optimization, and roadway design.\n\n - Working knowledge of utility design, geotechnical reports, and permitting requirements for industrial sites.\n\n - Strong communication skills and the ability to hold contractors accountable for quality, schedule, and budget.\n\n - Ability to work effectively with cross-functional teams, manage competing priorities, and support delivery of high-quality engineering packages under schedule constraints.\n\n\n\nPreferred\n\n - Professional Engineer (PE) license in civil engineering, or the ability to obtain one within 12 months.\n\n - Experience with mining, mineral processing, chemical, or heavy industrial facilities.\n\n - Experience developing software tools or automating design workflows.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$150K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$150K - $200K","compensationTiers":[{"id":"151590de-10e1-4185-bd5b-f6a74a39f841","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors: $150K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"a87854eb-f587-477d-9fb0-30353b87141c","summary":"Estimated Base Salary, final salary based on experience, location, and other factors: $150K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"id":"9c331890-8c0e-4afb-a9fe-679213b9b40e","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":150000,"maxValue":200000},{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null}]}},{"id":"237dfe0c-7f9d-4264-bb8d-36e4012089bd","title":"Sr. Software Engineer, Infrastructure","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-10-05T23:56:05.231+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/237dfe0c-7f9d-4264-bb8d-36e4012089bd","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/237dfe0c-7f9d-4264-bb8d-36e4012089bd/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for a Sr. or Staff Software Engineer, Infrastructure to join the team that owns and collaborates on the platform every other engineer here builds on.
Our software team builds MarianaOS, the operating system for how Mariana engineers, constructs, and operates its mines and mineral processing facilities. It runs in AWS and on edge clusters at our sites, including our copper site in Moab, Utah and our lithium facility in East Texas. On any given day, it serves construction dashboards, running GPU inference on site camera feeds, training models for a lithium extraction circuit, and moving plant floor data into a warehouse.
Your team owns the platform underneath all of that: clusters, deployment, CI/CD, observability, site/edge footprint, identity, secrets, and cloud costs. You will also collaborate with machine learning engineers and data engineers on the ML compute platform and data pipeline infrastructure.
The part of this role we care most about is what you build for other people. We do not want an approval queue. When an engineer needs a database, a bucket, a dashboard, or an alert, they should get it from a documented path they can run themselves, and your job is to make that path exist and make it the easiest option. You will be measured on how much infrastructure work happens without you.
We move quickly. Our engineers ship, get feedback from the people running our plants and job sites, and iterate. Everything you build should shorten that loop.
Our stack is TypeScript and React on the front end, Node and Python services, Postgres, and AWS. The platform is EKS with Karpenter, ArgoCD, Helm, Pulumi, Prometheus and Grafana, Loki, Prefect, Snowflake, and a growing amount of LLM and agent tooling in production.
Own our Kubernetes footprint end to end: the EKS cluster, the on-premises site clusters, cluster upgrades, capacity and autoscaling, ingress and DNS, and the GitOps delivery path that turns a merged commit into a running service.
Build self-service infrastructure for other engineers, so that provisioning a service, a database, a preview environment, or a scheduled job is a documented path they run themselves so the team can deliver quickly.
Make observability a default. Every deployed service should emit metrics, ship logs, trace requests, and carry meaningful alerts without its author's writing bespoke plumbing.
Extend the platform to our sites, running on-premises and edge clusters that host GPU inference and plant data collection over constrained links.
Own cloud cost as an engineering problem, with the visibility, budgets, and right-sizing to keep a growing platform from growing its bill proportionally.
Own identity, access, and secrets management, so that scoped access is provisioned and revoked as a matter of course.
Respond to infrastructure incidents and then remove the class of failure that caused them, including writing the runbook so the fix scales.
8-12+ years building and operating production infrastructure, with real depth in Kubernetes: you have run and upgraded clusters yourself and debugged multiple layers below the application.
Strong software engineering fundamentals. You write code you would be comfortable having reviewed by a product engineer, and you reach for a well-designed tool or abstraction before a runbook.
Hands-on experience with infrastructure as code (Pulumi, Terraform, or similar) and GitOps-style continuous delivery.
A track record of building platforms other engineers adopted willingly. We will ask you for specifics: what you built, who used it, and how you know it helped.
Practical observability experience with Prometheus, Grafana, and a log aggregation stack, and getting an organization to instrument its services.
Comfort operating across a broad surface with incomplete context.
Fluency in Python or TypeScript, and enough familiarity with AWS to make sound cost and architecture tradeoffs.
Experience supporting ML or data-intensive workloads (GPU scheduling, distributed training, pipeline orchestration) is a strong plus.
Experience with on-premise or edge infrastructure, industrial networks, or constrained-connectivity environments is a strong plus.
Startup experience in a rapidly scaling company is helpful but not required.
Domain experience in manufacturing, industrial automation, mining, or capital projects is beneficial but not required.
We want to see you design and build platform tooling, so the loop is weighted toward that.
Expect a conversation about a platform you have built and why you made the calls you made, a working session where you design a self-service capability for an engineering org and we push on the tradeoffs, and a hands-on exercise with infrastructure code.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nMariana Minerals is looking for a Sr. or Staff Software Engineer, Infrastructure to join the team that owns and collaborates on the platform every other engineer here builds on.\n\nOur software team builds MarianaOS, the operating system for how Mariana engineers, constructs, and operates its mines and mineral processing facilities. It runs in AWS and on edge clusters at our sites, including our copper site in Moab, Utah and our lithium facility in East Texas. On any given day, it serves construction dashboards, running GPU inference on site camera feeds, training models for a lithium extraction circuit, and moving plant floor data into a warehouse.\n\nYour team owns the platform underneath all of that: clusters, deployment, CI/CD, observability, site/edge footprint, identity, secrets, and cloud costs. You will also collaborate with machine learning engineers and data engineers on the ML compute platform and data pipeline infrastructure.\n\nThe part of this role we care most about is what you build for other people. We do not want an approval queue. When an engineer needs a database, a bucket, a dashboard, or an alert, they should get it from a documented path they can run themselves, and your job is to make that path exist and make it the easiest option. You will be measured on how much infrastructure work happens without you.\n\nWe move quickly. Our engineers ship, get feedback from the people running our plants and job sites, and iterate. Everything you build should shorten that loop.\n\nOur stack is TypeScript and React on the front end, Node and Python services, Postgres, and AWS. The platform is EKS with Karpenter, ArgoCD, Helm, Pulumi, Prometheus and Grafana, Loki, Prefect, Snowflake, and a growing amount of LLM and agent tooling in production.\n\n\nWHAT YOU'LL DO\n\nOwn our Kubernetes footprint end to end: the EKS cluster, the on-premises site clusters, cluster upgrades, capacity and autoscaling, ingress and DNS, and the GitOps delivery path that turns a merged commit into a running service.\n\nBuild self-service infrastructure for other engineers, so that provisioning a service, a database, a preview environment, or a scheduled job is a documented path they run themselves so the team can deliver quickly.\n\nMake observability a default. Every deployed service should emit metrics, ship logs, trace requests, and carry meaningful alerts without its author's writing bespoke plumbing.\n\nExtend the platform to our sites, running on-premises and edge clusters that host GPU inference and plant data collection over constrained links.\n\nOwn cloud cost as an engineering problem, with the visibility, budgets, and right-sizing to keep a growing platform from growing its bill proportionally.\n\nOwn identity, access, and secrets management, so that scoped access is provisioned and revoked as a matter of course.\n\nRespond to infrastructure incidents and then remove the class of failure that caused them, including writing the runbook so the fix scales.\n\n\nWHAT YOU'LL BRING\n\n8-12+ years building and operating production infrastructure, with real depth in Kubernetes: you have run and upgraded clusters yourself and debugged multiple layers below the application.\n\nStrong software engineering fundamentals. You write code you would be comfortable having reviewed by a product engineer, and you reach for a well-designed tool or abstraction before a runbook.\n\nHands-on experience with infrastructure as code (Pulumi, Terraform, or similar) and GitOps-style continuous delivery.\n\nA track record of building platforms other engineers adopted willingly. We will ask you for specifics: what you built, who used it, and how you know it helped.\n\nPractical observability experience with Prometheus, Grafana, and a log aggregation stack, and getting an organization to instrument its services.\n\nComfort operating across a broad surface with incomplete context.\n\nFluency in Python or TypeScript, and enough familiarity with AWS to make sound cost and architecture tradeoffs.\n\nExperience supporting ML or data-intensive workloads (GPU scheduling, distributed training, pipeline orchestration) is a strong plus.\n\nExperience with on-premise or edge infrastructure, industrial networks, or constrained-connectivity environments is a strong plus.\n\nStartup experience in a rapidly scaling company is helpful but not required.\n\nDomain experience in manufacturing, industrial automation, mining, or capital projects is beneficial but not required.\n\n\nHOW WE'LL INTERVIEW\n\nWe want to see you design and build platform tooling, so the loop is weighted toward that.\n\nExpect a conversation about a platform you have built and why you made the calls you made, a working session where you design a self-service capability for an engineering org and we push on the tradeoffs, and a hands-on exercise with infrastructure code.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $200K","compensationTiers":[{"id":"a152b175-70f2-418a-9360-b7b747eb1b8a","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"991494d6-e633-4b56-a812-e9c4db06590b","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"00d4d69e-63e5-4e00-ad4a-25f443a57209","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000}]}},{"id":"4665e5ec-e3b2-4c3b-b381-d1e80c391203","title":"Sr. Software Engineer, Autonomy","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[{"location":"Houston, TX","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}}},{"location":"Ann Arbor, MI","address":{"postalAddress":{"addressRegion":"Michigan","addressCountry":"United States","addressLocality":"Ann Arbor"}}}],"publishedAt":"2026-10-06T16:55:05.153+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/4665e5ec-e3b2-4c3b-b381-d1e80c391203","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/4665e5ec-e3b2-4c3b-b381-d1e80c391203/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring Sr. and Staff Software Engineers (Autonomy) to build the onboard and platform software that carries our mining vehicles from raw sensor data to safe, reliable motion.
In this role you will own the software the rest of the autonomy stack runs on: sensor drivers and data pipelines on the vehicle computer, time synchronization and calibration, deployment and monitoring, the handoff of data from the vehicle to the cloud, simulation and test infrastructure, and the drive-by-wire interface and low-level control logic. You will carry work from design through implementation, simulation, and bench and field validation on real equipment at our mine sites, working hand in hand with our machine learning, hardware, controls, and mine operations teams. This is a hands-on, first-principles role for an engineer who wants to get people out of the pit and build the world’s first fully autonomous mines.
Build and maintain the onboard software stack for our autonomous mining vehicles, from sensor drivers through actuation commands, on industrial PCs that run in dust, vibration, and heat
Own time synchronization and calibration across LiDAR, cameras, radar, IMU, and GNSS so perception and localization get data they can trust
Build the pipelines that move sensor and telemetry data off the vehicle and into the cloud, including logging, recording, and labeling data for perception development and evaluation
Build deployment, monitoring, and fault-management tooling so we can update and operate a fleet of vehicles without logging into each one, and so the system detects and responds to software, sensor, compute, and network failures
Develop equipment simulations and test infrastructure, including replay of field logs, evaluation datasets, and vehicle models for acceleration, turning radius, and actuation latency
Integrate with drive-by-wire systems and write the low-level control logic and safety layer that connect the autonomy stack to the vehicle, including degraded operating modes and e-stop behavior
Work with our MineOS and mine operations teams so the autonomy system exposes the health, faults, and metrics operators need to run it safely
Bachelor's degree in Computer Science, Computer Engineering, Robotics, Electrical, or related engineering discipline
5-8+ years building software for robots, vehicles, or other systems that act in the physical world
Strong proficiency in C++ and/or Python, and experience with Linux and a robotics middleware such as ROS/ROS 2
Hands-on experience with sensor drivers, data pipelines, time synchronization, or calibration for LiDAR, cameras, radar, IMU, or GNSS
Working knowledge of real-time and embedded systems, networking, and debugging across the software-hardware boundary
Experience with simulation, logging and replay, or test and deployment infrastructure for robotics systems
Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nABOUT THE ROLE\n\nWe are hiring Sr. and Staff Software Engineers (Autonomy) to build the onboard and platform software that carries our mining vehicles from raw sensor data to safe, reliable motion.\n\nIn this role you will own the software the rest of the autonomy stack runs on: sensor drivers and data pipelines on the vehicle computer, time synchronization and calibration, deployment and monitoring, the handoff of data from the vehicle to the cloud, simulation and test infrastructure, and the drive-by-wire interface and low-level control logic. You will carry work from design through implementation, simulation, and bench and field validation on real equipment at our mine sites, working hand in hand with our machine learning, hardware, controls, and mine operations teams. This is a hands-on, first-principles role for an engineer who wants to get people out of the pit and build the world’s first fully autonomous mines.\n\n\nWHAT YOU’LL DO\n\n - Build and maintain the onboard software stack for our autonomous mining vehicles, from sensor drivers through actuation commands, on industrial PCs that run in dust, vibration, and heat\n\n - Own time synchronization and calibration across LiDAR, cameras, radar, IMU, and GNSS so perception and localization get data they can trust\n\n - Build the pipelines that move sensor and telemetry data off the vehicle and into the cloud, including logging, recording, and labeling data for perception development and evaluation\n\n - Build deployment, monitoring, and fault-management tooling so we can update and operate a fleet of vehicles without logging into each one, and so the system detects and responds to software, sensor, compute, and network failures\n\n - Develop equipment simulations and test infrastructure, including replay of field logs, evaluation datasets, and vehicle models for acceleration, turning radius, and actuation latency\n\n - Integrate with drive-by-wire systems and write the low-level control logic and safety layer that connect the autonomy stack to the vehicle, including degraded operating modes and e-stop behavior\n\n - Work with our MineOS and mine operations teams so the autonomy system exposes the health, faults, and metrics operators need to run it safely\n\n\nWHAT YOU’LL BRING\n\n - Bachelor's degree in Computer Science, Computer Engineering, Robotics, Electrical, or related engineering discipline\n\n - 5-8+ years building software for robots, vehicles, or other systems that act in the physical world\n\n - Strong proficiency in C++ and/or Python, and experience with Linux and a robotics middleware such as ROS/ROS 2\n\n - Hands-on experience with sensor drivers, data pipelines, time synchronization, or calibration for LiDAR, cameras, radar, IMU, or GNSS\n\n - Working knowledge of real-time and embedded systems, networking, and debugging across the software-hardware boundary\n\n - Experience with simulation, logging and replay, or test and deployment infrastructure for robotics systems\n\n - Experience in autonomous vehicles, robotics, automotive, or off-highway equipment strongly preferred\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$140K – $200K • Offers Equity","scrapeableCompensationSalarySummary":"$140K - $200K","compensationTiers":[{"id":"9dbf8b7a-fe3a-4c0d-8007-e787aa36edc9","tierSummary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $200K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"00edb08f-5a9a-4eb4-8dfd-3e4b654fdcdb","summary":"Offers Equity","compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"id":"7ba78ade-6bc0-4f35-b435-706ce70dde8d","summary":"Estimated Base Salary, final salary based on experience, location, and other factors $140K – $200K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000}]}],"summaryComponents":[{"compensationType":"EquityPercentage","interval":"NONE","currencyCode":null,"minValue":null,"maxValue":null},{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":140000,"maxValue":200000}]}},{"id":"919f75fc-6fb2-4081-b788-59dac00e3ffe","title":"Core Driller","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-07T01:01:15.061+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/919f75fc-6fb2-4081-b788-59dac00e3ffe","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/919f75fc-6fb2-4081-b788-59dac00e3ffe/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Core Driller operates diamond core drill rigs at our open-pit copper mine, drilling for mineral exploration and resource definition. The role focuses on safe, accurate drilling to plan, high-quality core recovery, equipment care, and following health, safety and environmental standards. Diamond core experience is ideal, but we also welcome strong drillers from reverse circulation (RC), air rotary or blast hole backgrounds. A driller who can lead and train a Driller Assistant is strongly preferred. Help us build the world's first fully autonomous mine.
Responsibilities
Safely operate a diamond core drill rig in line with site procedures, manufacturer specs and MSHA requirements
Collar holes accurately and hold the right angles, depths and alignment per the drill plan
Do thorough pre-start inspections, routine servicing and basic troubleshooting to keep downtime low
Monitor and adjust drilling parameters such as fluid pressure, rotation speed, weight on bit and penetration rate
Make sure core is recovered, measured, labeled and boxed correctly, with good contamination control
Keep accurate drill logs, footage drilled and daily production reports
Recognize changes in ground conditions and flag them to the geologist and supervisors
Lead and mentor the Driller Assistant and keep the crew working safely
Keep the drill pad and equipment area clean and organized
Handle equipment breakdowns and emergencies with a calm, safety-first approach
Qualifications
2+ years of drilling experience, ideally as a diamond core driller
RC, air rotary or blast hole drillers are also encouraged to apply
Strong mechanical aptitude and a solid understanding of drilling techniques and equipment
Experience training or leading drill helpers is a strong plus
Real commitment to safety
Valid driver's license; CDL is a plus
Schedule
7 days on / 7 days off, 12-hour day shifts
Housing & Relocation: Housing and relocation assistance options are available.
Working Environment & Physical Requirements
Work 12-hour shifts outdoors on drill pads and rugged terrain, in all weather and extreme temperatures
Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel
Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Core Driller operates diamond core drill rigs at our open-pit copper mine, drilling for mineral exploration and resource definition. The role focuses on safe, accurate drilling to plan, high-quality core recovery, equipment care, and following health, safety and environmental standards. Diamond core experience is ideal, but we also welcome strong drillers from reverse circulation (RC), air rotary or blast hole backgrounds. A driller who can lead and train a Driller Assistant is strongly preferred. Help us build the world's first fully autonomous mine.\n\nResponsibilities\n\n - Safely operate a diamond core drill rig in line with site procedures, manufacturer specs and MSHA requirements\n\n - Collar holes accurately and hold the right angles, depths and alignment per the drill plan\n\n - Do thorough pre-start inspections, routine servicing and basic troubleshooting to keep downtime low\n\n - Monitor and adjust drilling parameters such as fluid pressure, rotation speed, weight on bit and penetration rate\n\n - Make sure core is recovered, measured, labeled and boxed correctly, with good contamination control\n\n - Keep accurate drill logs, footage drilled and daily production reports\n\n - Recognize changes in ground conditions and flag them to the geologist and supervisors\n\n - Lead and mentor the Driller Assistant and keep the crew working safely\n\n - Keep the drill pad and equipment area clean and organized\n\n - Handle equipment breakdowns and emergencies with a calm, safety-first approach\n\nQualifications\n\n - 2+ years of drilling experience, ideally as a diamond core driller\n\n - RC, air rotary or blast hole drillers are also encouraged to apply\n\n - Strong mechanical aptitude and a solid understanding of drilling techniques and equipment\n\n - Experience training or leading drill helpers is a strong plus\n\n - Real commitment to safety\n\n - Valid driver's license; CDL is a plus\n\nSchedule\n\n - 7 days on / 7 days off, 12-hour day shifts\n\n - Housing & Relocation: Housing and relocation assistance options are available.\n\nWorking Environment & Physical Requirements\n\n - Work 12-hour shifts outdoors on drill pads and rugged terrain, in all weather and extreme temperatures\n\n - Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel\n\n - Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"40288700-ce16-4680-bdaf-422a2b875f6c","title":"Engineering Manager, MarianaOS","department":"Software Development","team":"Software Development","employmentType":"FullTime","location":"San Francisco HQ","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-10-06T22:29:41.210+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"California","addressCountry":"US","addressLocality":"San Francisco"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/40288700-ce16-4680-bdaf-422a2b875f6c","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/40288700-ce16-4680-bdaf-422a2b875f6c/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Mariana Minerals is looking for an Engineering Manager to build and lead a team of software engineers working on the critical minerals supply chain that supports the world's energy transition.
Our software team builds MarianaOS, the operating system for how Mariana engineers, constructs, and operates its mines and mineral processing facilities. The work spans capital projects, plant operations, autonomous equipment, and the data systems that connect them. Our users are our own project engineers, construction teams, and operators at our copper site in Moab, Utah and lithium facility in East Texas. That creates an unusually short feedback loop: what your team ships can change what happens on the ground within days.
As an Engineering Manager, you will own the performance and growth of your engineers and the team's ability to deliver reliably. You'll be responsible for 1:1s, feedback, performance reviews, career development, hiring, compensation input and advocacy, and delivery against roadmap commitments.
You'll partner closely with tech leads, senior engineers, and product managers. Tech leads and engineers own technical direction within the team's domains; product managers will own priorities; you own the team—how it grows, how it works, and whether it delivers. We expect managers to stay technically engaged and contribute hands-on when that is the highest-leverage use of their time, while prioritizing the work only a manager can do.
We also expect engineering managers to apply an engineering mindset to management itself. You should help define and continuously iterate on the metrics we use to understand engineering performance, and build the tools and systems that make those metrics useful in practice. That means developing a clear picture of where work is getting stuck, how reliably the team is delivering, where engineers need support, and where process is creating unnecessary friction. As agentic tooling becomes more capable, we expect managers to actively explore how agents and automation can improve management workflows; synthesizing project and team context, surfacing risks and action items, and increasing velocity.
We move quickly. Our engineers ship, get feedback from the people running our plants and job sites, and iterate. Creating the conditions for that pace—and preserving it as the team grows—is central to this role.
Our stack is TypeScript and React on the front end, Node and Python services, Postgres, and AWS, with a growing amount of LLM and agent tooling in production.
Build and lead a team of software engineers, owning 1:1s, feedback, performance reviews, career development, and compensation input and advocacy.
Own the hiring funnel for your teams, from sourcing and interviewing through closing and onboarding, shaping the team's mix of skills, seniority, and ownership as it grows.
Deliver predictably against roadmap commitments. Give Product a counterpart who can say what is technically possible, how long it will take, and what it will cost in schedule or reliability, and give Product, Operations, and leadership early warning when something is slipping.
Create the conditions for the team to ship quickly and iterate from real feedback, working directly with the engineering, construction, and operations teams who use what you build.
Break down ambiguous problems, sequence the work, and keep the team unblocked, using a planning cadence that fits how the team operates.
Partner with your Tech Lead and senior engineers on technical direction, staying close enough to the architecture to maintain a high bar.
Build a resilient team by growing engineers into larger scope, addressing morale and conflict early, and reducing critical dependencies on any one person.
Run the team's review, documentation, and ownership practices so the work survives the person who built it.
3-5+ years managing software engineers directly, including performance management, career development, and hiring.
8+ years in software, with the technical depth to make sound tradeoffs alongside strong Tech Leads and senior engineers.
You can review a design or a change you didn't write, spot the flaw, and give feedback that makes the engineer better.
A track record of teams delivering predictably under real deadlines, with estimates and commitments stakeholders learned to trust.
Demonstrated success growing engineers through promotions, expanded scope, and increasing ownership.
Strong experience translating between non-technical stakeholders and engineering teams, including communicating technical constraints clearly.
A bias toward shipping and learning from feedback rather than waiting for a complete plan.
Experience bringing structure to ambiguous, fast-moving problems.
Startup experience in a rapidly scaling company is helpful but not required.
Experience in manufacturing, industrial automation, mining, or capital projects is beneficial but not required.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nROLE OVERVIEW\n\nMariana Minerals is looking for an Engineering Manager to build and lead a team of software engineers working on the critical minerals supply chain that supports the world's energy transition.\n\nOur software team builds MarianaOS, the operating system for how Mariana engineers, constructs, and operates its mines and mineral processing facilities. The work spans capital projects, plant operations, autonomous equipment, and the data systems that connect them. Our users are our own project engineers, construction teams, and operators at our copper site in Moab, Utah and lithium facility in East Texas. That creates an unusually short feedback loop: what your team ships can change what happens on the ground within days.\n\nAs an Engineering Manager, you will own the performance and growth of your engineers and the team's ability to deliver reliably. You'll be responsible for 1:1s, feedback, performance reviews, career development, hiring, compensation input and advocacy, and delivery against roadmap commitments.\n\nYou'll partner closely with tech leads, senior engineers, and product managers. Tech leads and engineers own technical direction within the team's domains; product managers will own priorities; you own the team—how it grows, how it works, and whether it delivers. We expect managers to stay technically engaged and contribute hands-on when that is the highest-leverage use of their time, while prioritizing the work only a manager can do.\n\nWe also expect engineering managers to apply an engineering mindset to management itself. You should help define and continuously iterate on the metrics we use to understand engineering performance, and build the tools and systems that make those metrics useful in practice. That means developing a clear picture of where work is getting stuck, how reliably the team is delivering, where engineers need support, and where process is creating unnecessary friction. As agentic tooling becomes more capable, we expect managers to actively explore how agents and automation can improve management workflows; synthesizing project and team context, surfacing risks and action items, and increasing velocity.\n\nWe move quickly. Our engineers ship, get feedback from the people running our plants and job sites, and iterate. Creating the conditions for that pace—and preserving it as the team grows—is central to this role.\n\nOur stack is TypeScript and React on the front end, Node and Python services, Postgres, and AWS, with a growing amount of LLM and agent tooling in production.\n\n\nWHAT YOU'LL DO\n\n - Build and lead a team of software engineers, owning 1:1s, feedback, performance reviews, career development, and compensation input and advocacy.\n\n - Own the hiring funnel for your teams, from sourcing and interviewing through closing and onboarding, shaping the team's mix of skills, seniority, and ownership as it grows.\n\n - Deliver predictably against roadmap commitments. Give Product a counterpart who can say what is technically possible, how long it will take, and what it will cost in schedule or reliability, and give Product, Operations, and leadership early warning when something is slipping.\n\n - Create the conditions for the team to ship quickly and iterate from real feedback, working directly with the engineering, construction, and operations teams who use what you build.\n\n - Break down ambiguous problems, sequence the work, and keep the team unblocked, using a planning cadence that fits how the team operates.\n\n - Partner with your Tech Lead and senior engineers on technical direction, staying close enough to the architecture to maintain a high bar.\n\n - Build a resilient team by growing engineers into larger scope, addressing morale and conflict early, and reducing critical dependencies on any one person.\n\n - Run the team's review, documentation, and ownership practices so the work survives the person who built it.\n\n\nWHAT YOU'LL BRING\n\n - 3-5+ years managing software engineers directly, including performance management, career development, and hiring.\n\n - 8+ years in software, with the technical depth to make sound tradeoffs alongside strong Tech Leads and senior engineers.\n\n - You can review a design or a change you didn't write, spot the flaw, and give feedback that makes the engineer better.\n\n - A track record of teams delivering predictably under real deadlines, with estimates and commitments stakeholders learned to trust.\n\n - Demonstrated success growing engineers through promotions, expanded scope, and increasing ownership.\n\n - Strong experience translating between non-technical stakeholders and engineering teams, including communicating technical constraints clearly.\n\n - A bias toward shipping and learning from feedback rather than waiting for a complete plan.\n\n - Experience bringing structure to ambiguous, fast-moving problems.\n\n - Startup experience in a rapidly scaling company is helpful but not required.\n\n - Experience in manufacturing, industrial automation, mining, or capital projects is beneficial but not required.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$180 – $225 • Offers Equity","scrapeableCompensationSalarySummary":"$180 - $225","compensationTiers":[{"id":"54760cff-2914-478b-a898-863c60c5488c","tierSummary":"$180 – $225 • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"6e1f5ace-a201-45c5-a404-3ae19d6ef171","summary":"$180 – $225","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180,"maxValue":225},{"id":"cd26812e-7be6-47c1-8932-57f0a46d7ab2","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":180,"maxValue":225},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"253cdd11-e3c7-4ff6-a273-2243f0884555","title":"Blast Hole Driller","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-07T00:48:52.959+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/253cdd11-e3c7-4ff6-a273-2243f0884555","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/253cdd11-e3c7-4ff6-a273-2243f0884555/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Blast Hole Driller operates production drill rigs at our open-pit copper mine, drilling blast patterns that keep mining operations on schedule. The role focuses on safe, accurate drilling to plan, equipment care, and following health, safety and environmental standards. Open-pit blast hole experience is ideal, but we also welcome strong drillers from underground, reverse circulation (RC) or diamond core backgrounds. A utility player who can both drill and run heavy equipment is strongly preferred. Help us build the world's first fully autonomous mine.
Responsibilities
Safely operate a blast hole drill rig in line with site procedures, manufacturer specs and MSHA requirements
Drill production holes to plan, holding the right hole locations, depths and angles
Do thorough pre-start inspections, routine servicing and basic troubleshooting to keep downtime low
Monitor and adjust drilling parameters such as air pressure, rotation speed and penetration rate
Keep accurate drill logs and daily production reports
Recognize changes in ground conditions and flag them to supervisors and blasting crews
Work closely with blasters, operators and supervisors to keep the pit moving
Help out on other heavy equipment as needed (training provided)
Keep the drill bench and equipment area clean and organized
Handle equipment breakdowns and emergencies with a calm, safety-first approach
Qualifications
2+ years of drilling experience, ideally as an open-pit blast hole driller
Underground, reverse circulation (RC) or diamond core drillers are also encouraged to apply
Strong mechanical aptitude and a solid understanding of drilling techniques and equipment
Heavy equipment experience is a strong plus
Real commitment to safety
Valid driver's license; CDL is a plus
Schedule
7 days on / 7 days off, 12-hour day shifts
Housing & Relocation: Housing and relocation assistance options are available.
Working Environment & Physical Requirements
Work 12-hour shifts outdoors on drill benches and rugged terrain, in all weather and extreme temperatures
Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel
Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Blast Hole Driller operates production drill rigs at our open-pit copper mine, drilling blast patterns that keep mining operations on schedule. The role focuses on safe, accurate drilling to plan, equipment care, and following health, safety and environmental standards. Open-pit blast hole experience is ideal, but we also welcome strong drillers from underground, reverse circulation (RC) or diamond core backgrounds. A utility player who can both drill and run heavy equipment is strongly preferred. Help us build the world's first fully autonomous mine.\n\nResponsibilities\n\n - Safely operate a blast hole drill rig in line with site procedures, manufacturer specs and MSHA requirements\n\n - Drill production holes to plan, holding the right hole locations, depths and angles\n\n - Do thorough pre-start inspections, routine servicing and basic troubleshooting to keep downtime low\n\n - Monitor and adjust drilling parameters such as air pressure, rotation speed and penetration rate\n\n - Keep accurate drill logs and daily production reports\n\n - Recognize changes in ground conditions and flag them to supervisors and blasting crews\n\n - Work closely with blasters, operators and supervisors to keep the pit moving\n\n - Help out on other heavy equipment as needed (training provided)\n\n - Keep the drill bench and equipment area clean and organized\n\n - Handle equipment breakdowns and emergencies with a calm, safety-first approach\n\nQualifications\n\n - 2+ years of drilling experience, ideally as an open-pit blast hole driller\n\n - Underground, reverse circulation (RC) or diamond core drillers are also encouraged to apply\n\n - Strong mechanical aptitude and a solid understanding of drilling techniques and equipment\n\n - Heavy equipment experience is a strong plus\n\n - Real commitment to safety\n\n - Valid driver's license; CDL is a plus\n\nSchedule\n\n - 7 days on / 7 days off, 12-hour day shifts\n\n - Housing & Relocation: Housing and relocation assistance options are available.\n\nWorking Environment & Physical Requirements\n\n - Work 12-hour shifts outdoors on drill benches and rugged terrain, in all weather and extreme temperatures\n\n - Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel\n\n - Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"82e04690-c424-4cf6-a687-d19e2480460d","title":"Core Driller Assistant","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-07T00:50:25.963+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/82e04690-c424-4cf6-a687-d19e2480460d","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/82e04690-c424-4cf6-a687-d19e2480460d/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Core Driller Assistant works alongside the Core Driller to support diamond core drilling for mineral exploration and resource definition at our open-pit copper mine. The role focuses on safe rig operations, careful core handling and recovery, equipment care, and following health, safety and environmental standards. Experience with reverse circulation (RC), air rotary or water-well drilling carries over well. It's a strong entry point for anyone looking to build a career toward Driller. Help us build the world's first fully autonomous mine.
Responsibilities
Help the Driller safely set up, move and tear down the drill rig and drill pad
Handle rods, core barrels, casing and tooling while tripping in and out of the hole
Pull, clean, measure, label and box core accurately, with good contamination control
Mix and manage drilling fluids, and maintain water lines, pumps and supply systems
Do pre-start inspections, greasing, lubrication and basic maintenance on the rig, compressors, pumps and support equipment
Help keep drill logs, footage drilled, consumables used and daily reports
Keep an inventory of bits and supplies, and let the Driller know when stock is low
Recognize changes in ground conditions and flag them to the Driller and geologist
Keep the drill pad and equipment area clean and organized
Handle equipment breakdowns and emergencies with a calm, safety-first approach
Qualifications
Experience as a driller's helper, offsider or rig hand, or comparable hands-on field, construction or mechanical work
Diamond core, reverse circulation (RC) or water-well drilling experience is a plus
Strong mechanical aptitude and willingness to learn drilling techniques and equipment
Real commitment to safety and following procedures
Valid driver's license; CDL is a plus
Schedule
7 days on / 7 days off, 12-hour day shifts
Housing & Relocation: Housing and relocation assistance options are available.
Working Environment & Physical Requirements
Work 12-hour shifts outdoors on drill pads and rugged terrain, in all weather and extreme temperatures
Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel
Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Core Driller Assistant works alongside the Core Driller to support diamond core drilling for mineral exploration and resource definition at our open-pit copper mine. The role focuses on safe rig operations, careful core handling and recovery, equipment care, and following health, safety and environmental standards. Experience with reverse circulation (RC), air rotary or water-well drilling carries over well. It's a strong entry point for anyone looking to build a career toward Driller. Help us build the world's first fully autonomous mine.\n\nResponsibilities\n\n - Help the Driller safely set up, move and tear down the drill rig and drill pad\n\n - Handle rods, core barrels, casing and tooling while tripping in and out of the hole\n\n - Pull, clean, measure, label and box core accurately, with good contamination control\n\n - Mix and manage drilling fluids, and maintain water lines, pumps and supply systems\n\n - Do pre-start inspections, greasing, lubrication and basic maintenance on the rig, compressors, pumps and support equipment\n\n - Help keep drill logs, footage drilled, consumables used and daily reports\n\n - Keep an inventory of bits and supplies, and let the Driller know when stock is low\n\n - Recognize changes in ground conditions and flag them to the Driller and geologist\n\n - Keep the drill pad and equipment area clean and organized\n\n - Handle equipment breakdowns and emergencies with a calm, safety-first approach\n\nQualifications\n\n - Experience as a driller's helper, offsider or rig hand, or comparable hands-on field, construction or mechanical work\n\n - Diamond core, reverse circulation (RC) or water-well drilling experience is a plus\n\n - Strong mechanical aptitude and willingness to learn drilling techniques and equipment\n\n - Real commitment to safety and following procedures\n\n - Valid driver's license; CDL is a plus\n\nSchedule\n\n - 7 days on / 7 days off, 12-hour day shifts\n\n - Housing & Relocation: Housing and relocation assistance options are available.\n\nWorking Environment & Physical Requirements\n\n - Work 12-hour shifts outdoors on drill pads and rugged terrain, in all weather and extreme temperatures\n\n - Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel\n\n - Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"b269e3e7-dbd9-4aa6-9470-1c3f511d5649","title":"Lab Manager ","department":"Process Development","team":"Process Development","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-08T16:24:24.046+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/b269e3e7-dbd9-4aa6-9470-1c3f511d5649","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/b269e3e7-dbd9-4aa6-9470-1c3f511d5649/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is seeking a highly organized and technically strong Lab Manager to build and lead the analytical laboratory supporting our DSM Pilot Plant in Houston. The DSM pilot couples a high temperature pyrometallurgical section with a downstream hydrometallurgical refining section, so the laboratory has to handle everything from feeds, calcines, slags, and dusts to leach solutions, loaded and stripped organics, precipitates, products, and effluent.
You will stand the laboratory up from an empty room: equipment selection and commissioning, method development and validation, QA/QC systems, staffing, and the data workflows that connect results to plant decisions. Once the plant is running, you own turnaround time and data quality for round-the-clock campaigns, where an assay result can determine whether the plant keeps running.
What you'll do
Build and lead the laboratory
Lead daily laboratory operations supporting pilot plant campaigns, process development, and product qualification
Specify, purchase, install, and commission analytical instrumentation and sample preparation equipment for a new laboratory, and manage the associated capital and operating budgets
Supervise, mentor, and develop analytical chemists and technicians, including hiring, training and qualification records, scheduling, and performance reviews
Own the analytical program
Oversee analytical testing using ICP-OES, ICP-MS, XRF, XRD, titration, ion chromatography, and other relevant techniques
Own sample preparation for difficult mineral matrices, including crushing, pulverizing, splitting, drying, loss on ignition, acid digestion, and fusion of refractory materials
Establish, validate, and continuously improve analytical methods for high matrix solutions such as concentrated leach liquors, high salt streams, and organic phases from solvent extraction
Support pyrometallurgical characterization needs including elemental assay of feeds, calcines, slags, dusts, and residues, along with moisture, LOI, carbon and sulfur, and particle size analysis
Manage external and umpire laboratory relationships for methods held outside the site, including sample shipping, turnaround, and result reconciliation
Provide analytical inputs to mass balance and metallurgical accounting, and work with process engineers to resolve balance closure issues
Quality, data, and systems
Develop and enforce laboratory SOPs, QA/QC protocols, and data validation procedures, including certified reference materials, duplicates, spikes, blanks, and control charting
Collaborate with process and plant engineering on sampling-point design and validation, covering location, sampler type, frequency, and sample handling, and confirm that each point delivers a representative sample before it is relied on for process decisions.
Own detection limits, precision and accuracy targets, and documented uncertainty for every reported method
Implement and administer a laboratory information management system or equivalent digital data workflow, including sample chain of custody from the plant floor to the reported result
Set and hold turnaround time commitments by priority tier, so operations receives time-critical results fast enough to act on them
Maintain and oversee calibration, preventive maintenance, and troubleshooting of analytical instrumentation, and manage service contracts and vendor relationships
Manage laboratory inventory including consumables, gases, standards, and reagents
Safety and compliance
Ensure compliance with safety regulations, the chemical hygiene plan, and environmental requirements
Own safe handling, storage, and segregation of concentrated acids, bases, flammable solvents, and hazardous samples, including fume hood performance and emergency equipment readiness
Manage laboratory waste characterization, accumulation, and disposal in line with regulatory requirements
Lead laboratory incident investigation and corrective action, and participate in site hazard reviews
What You'll Bring
Bachelor or Master degree in Chemistry, Metallurgy, Materials Science, Chemical Engineering, or a related field
8 or more years of hands-on analytical laboratory experience, including significant experience with ICP-OES, ICP-MS, and XRF methods
3 or more years managing laboratory personnel or leading analytical teams
Demonstrated experience analyzing both solids and solutions from mineral processing or metallurgical operations, including sample preparation of refractory matrices by acid digestion and fusion
Strong understanding of inorganic chemistry, trace element analysis, matrix and interference effects, spectral corrections, and method validation
Experience supporting both high temperature and wet chemical process streams is strongly preferred, including slags, calcines, dusts, leach solutions, and solvent extraction phases
Demonstrated experience implementing QA/QC systems and maintaining data integrity standards in a production or pilot support environment
Experience standing up a new laboratory, or significantly expanding one, including instrument selection, installation, and qualification
Experience implementing or administering a LIMS or comparable digital data workflow
Experience in minerals processing, metallurgy, chemicals, specialty materials, or a similar industrial environment
Working knowledge of OSHA laboratory standards, chemical hygiene requirements, hazardous waste handling, and shipping of regulated samples
Strong organizational skills and the ability to manage multiple priorities in a fast-paced startup environment
Excellent written and verbal communication skills, and the ability to present analytical limitations and uncertainty clearly to engineers and operators
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nMariana Minerals is seeking a highly organized and technically strong Lab Manager to build and lead the analytical laboratory supporting our DSM Pilot Plant in Houston. The DSM pilot couples a high temperature pyrometallurgical section with a downstream hydrometallurgical refining section, so the laboratory has to handle everything from feeds, calcines, slags, and dusts to leach solutions, loaded and stripped organics, precipitates, products, and effluent.\n\nYou will stand the laboratory up from an empty room: equipment selection and commissioning, method development and validation, QA/QC systems, staffing, and the data workflows that connect results to plant decisions. Once the plant is running, you own turnaround time and data quality for round-the-clock campaigns, where an assay result can determine whether the plant keeps running.\n\nWhat you'll do\n\nBuild and lead the laboratory\n\n - Lead daily laboratory operations supporting pilot plant campaigns, process development, and product qualification\n\n - Specify, purchase, install, and commission analytical instrumentation and sample preparation equipment for a new laboratory, and manage the associated capital and operating budgets\n\n - Supervise, mentor, and develop analytical chemists and technicians, including hiring, training and qualification records, scheduling, and performance reviews\n\nOwn the analytical program\n\n - Oversee analytical testing using ICP-OES, ICP-MS, XRF, XRD, titration, ion chromatography, and other relevant techniques\n\n - Own sample preparation for difficult mineral matrices, including crushing, pulverizing, splitting, drying, loss on ignition, acid digestion, and fusion of refractory materials\n\n - Establish, validate, and continuously improve analytical methods for high matrix solutions such as concentrated leach liquors, high salt streams, and organic phases from solvent extraction\n\n - Support pyrometallurgical characterization needs including elemental assay of feeds, calcines, slags, dusts, and residues, along with moisture, LOI, carbon and sulfur, and particle size analysis\n\n - Manage external and umpire laboratory relationships for methods held outside the site, including sample shipping, turnaround, and result reconciliation\n\n - Provide analytical inputs to mass balance and metallurgical accounting, and work with process engineers to resolve balance closure issues\n\nQuality, data, and systems\n\n - Develop and enforce laboratory SOPs, QA/QC protocols, and data validation procedures, including certified reference materials, duplicates, spikes, blanks, and control charting\n\n - Collaborate with process and plant engineering on sampling-point design and validation, covering location, sampler type, frequency, and sample handling, and confirm that each point delivers a representative sample before it is relied on for process decisions.\n\n - Own detection limits, precision and accuracy targets, and documented uncertainty for every reported method\n\n - Implement and administer a laboratory information management system or equivalent digital data workflow, including sample chain of custody from the plant floor to the reported result\n\n - Set and hold turnaround time commitments by priority tier, so operations receives time-critical results fast enough to act on them\n\n - Maintain and oversee calibration, preventive maintenance, and troubleshooting of analytical instrumentation, and manage service contracts and vendor relationships\n\n - Manage laboratory inventory including consumables, gases, standards, and reagents\n\nSafety and compliance\n\n - Ensure compliance with safety regulations, the chemical hygiene plan, and environmental requirements\n\n - Own safe handling, storage, and segregation of concentrated acids, bases, flammable solvents, and hazardous samples, including fume hood performance and emergency equipment readiness\n\n - Manage laboratory waste characterization, accumulation, and disposal in line with regulatory requirements\n\n - Lead laboratory incident investigation and corrective action, and participate in site hazard reviews\n\nWhat You'll Bring \n\n - Bachelor or Master degree in Chemistry, Metallurgy, Materials Science, Chemical Engineering, or a related field\n\n - 8 or more years of hands-on analytical laboratory experience, including significant experience with ICP-OES, ICP-MS, and XRF methods\n\n - 3 or more years managing laboratory personnel or leading analytical teams\n\n - Demonstrated experience analyzing both solids and solutions from mineral processing or metallurgical operations, including sample preparation of refractory matrices by acid digestion and fusion\n\n - Strong understanding of inorganic chemistry, trace element analysis, matrix and interference effects, spectral corrections, and method validation\n\n - Experience supporting both high temperature and wet chemical process streams is strongly preferred, including slags, calcines, dusts, leach solutions, and solvent extraction phases\n\n - Demonstrated experience implementing QA/QC systems and maintaining data integrity standards in a production or pilot support environment\n\n - Experience standing up a new laboratory, or significantly expanding one, including instrument selection, installation, and qualification\n\n - Experience implementing or administering a LIMS or comparable digital data workflow\n\n - Experience in minerals processing, metallurgy, chemicals, specialty materials, or a similar industrial environment\n\n - Working knowledge of OSHA laboratory standards, chemical hygiene requirements, hazardous waste handling, and shipping of regulated samples\n\n - Strong organizational skills and the ability to manage multiple priorities in a fast-paced startup environment\n\n - Excellent written and verbal communication skills, and the ability to present analytical limitations and uncertainty clearly to engineers and operators\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"8cd9a944-4988-4147-b373-8bb730730804","title":"Staff Mining Engineer ","department":"Engineering","team":"Engineering","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":true,"secondaryLocations":[],"publishedAt":"2026-10-07T18:54:39.554+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/8cd9a944-4988-4147-b373-8bb730730804","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/8cd9a944-4988-4147-b373-8bb730730804/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
About the Role
Mariana Minerals is seeking a Staff Mining Engineer with 10+ years of mining experience and a strong background in hands-on, hard-rock open pit operations. This role connects mine planning with field execution, ensuring that designs and production schedules translate into safe, practical, and efficient mining activities.
You will lead short- and medium-term mine planning, support daily production execution, and improve mining performance. The ideal candidate understands how a mine actually operates: equipment capabilities, achievable productivities, operational delays, and the constraints that determine whether a plan can be delivered.
What You'll Do
Lead safety and uphold standards. Demonstrate visible safety leadership in the field. Incorporate operational risks, geotechnical requirements, and applicable standards into mine designs, schedules, and execution practices.
Develop mine plans and schedules. Prepare and maintain shift, daily, weekly, monthly, and rolling medium-term plans aligned with longer-term mine objectives, production targets, and available resources.
Turn plans into executable operations. Translate designs and schedules into clear work instructions, priorities, and field deliverables. Confirm access, working areas, equipment, blast readiness, and material destinations with operations teams.
Design practical mining layouts. Develop and update pit, bench, ramp, haul-road, stockpile, and waste-dump designs that meet safety requirements and support efficient equipment movement and mining sequences.
Plan ore and waste movement. Coordinate ore extraction, waste stripping, stockpiling, and material routing. Work with geology and processing teams to manage feed requirements, dilution, ore loss, and material tracking.
Optimize drilling and blasting. Improve blast designs and sequencing to achieve safe blasting, suitable fragmentation, efficient loading and hauling, and competitive costs. Coordinate drill-and-blast readiness with the production schedule.
Improve equipment productivity. Evaluate equipment capabilities, loader-truck matching, haul cycles, availability, utilization, and delays. Use realistic production assumptions and work with operations and maintenance to address constraints.
Monitor execution and reconcile performance. Compare actual production with the plan, investigate variances, identify root causes, and develop practical recovery plans. Feed operating results back into planning assumptions and schedules.
Optimize mining performance. Evaluate alternative designs, sequences, and operating approaches to improve productivity, reduce costs, and maintain ore supply. Use operational data and support improvements in digital planning and automation.
Collaborate and develop others. Work closely with operations, maintenance, geology, survey, geotechnical, processing, and software teams. Communicate priorities clearly, share knowledge, and mentor engineers.
What You'll Bring
Bachelor's degree in Mining Engineering.
10+ years of experience in the mining industry, including substantial hands-on experience in hard-rock open pit mining operations.
Expert proficiency in Deswik for mine design, mine planning, and production scheduling.
Strong experience in short- and medium-term planning, operational mine design, production scheduling, and mine plan execution.
Demonstrated experience in drill-and-blast optimization and ore and waste planning.
Strong practical understanding of mining equipment, production rates, haulage, operational delays, and the interaction between planning, operations, and maintenance.
Proven safety leadership and commitment to high mining industry standards and sound engineering practice.
Strong analytical, problem-solving, and communication skills, with the ability to work effectively with field crews and multidisciplinary teams.
Preferred Qualifications
Experience with heap-leach operations, leach-pad planning, stacking sequences, and coordination between mining and leaching.
Experience with autonomous mining equipment, operational data systems, or automation of mine planning and production workflows.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nAbout the Role\n\nMariana Minerals is seeking a Staff Mining Engineer with 10+ years of mining experience and a strong background in hands-on, hard-rock open pit operations. This role connects mine planning with field execution, ensuring that designs and production schedules translate into safe, practical, and efficient mining activities.\n\nYou will lead short- and medium-term mine planning, support daily production execution, and improve mining performance. The ideal candidate understands how a mine actually operates: equipment capabilities, achievable productivities, operational delays, and the constraints that determine whether a plan can be delivered.\n\nWhat You'll Do \n\n - Lead safety and uphold standards. Demonstrate visible safety leadership in the field. Incorporate operational risks, geotechnical requirements, and applicable standards into mine designs, schedules, and execution practices.\n\n - Develop mine plans and schedules. Prepare and maintain shift, daily, weekly, monthly, and rolling medium-term plans aligned with longer-term mine objectives, production targets, and available resources.\n\n - Turn plans into executable operations. Translate designs and schedules into clear work instructions, priorities, and field deliverables. Confirm access, working areas, equipment, blast readiness, and material destinations with operations teams.\n\n - Design practical mining layouts. Develop and update pit, bench, ramp, haul-road, stockpile, and waste-dump designs that meet safety requirements and support efficient equipment movement and mining sequences.\n\n - Plan ore and waste movement. Coordinate ore extraction, waste stripping, stockpiling, and material routing. Work with geology and processing teams to manage feed requirements, dilution, ore loss, and material tracking.\n\n - Optimize drilling and blasting. Improve blast designs and sequencing to achieve safe blasting, suitable fragmentation, efficient loading and hauling, and competitive costs. Coordinate drill-and-blast readiness with the production schedule.\n\n - Improve equipment productivity. Evaluate equipment capabilities, loader-truck matching, haul cycles, availability, utilization, and delays. Use realistic production assumptions and work with operations and maintenance to address constraints.\n\n - Monitor execution and reconcile performance. Compare actual production with the plan, investigate variances, identify root causes, and develop practical recovery plans. Feed operating results back into planning assumptions and schedules.\n\n - Optimize mining performance. Evaluate alternative designs, sequences, and operating approaches to improve productivity, reduce costs, and maintain ore supply. Use operational data and support improvements in digital planning and automation.\n\n - Collaborate and develop others. Work closely with operations, maintenance, geology, survey, geotechnical, processing, and software teams. Communicate priorities clearly, share knowledge, and mentor engineers.\n\nWhat You'll Bring \n\n - Bachelor's degree in Mining Engineering.\n\n - 10+ years of experience in the mining industry, including substantial hands-on experience in hard-rock open pit mining operations.\n\n - Expert proficiency in Deswik for mine design, mine planning, and production scheduling.\n\n - Strong experience in short- and medium-term planning, operational mine design, production scheduling, and mine plan execution.\n\n - Demonstrated experience in drill-and-blast optimization and ore and waste planning.\n\n - Strong practical understanding of mining equipment, production rates, haulage, operational delays, and the interaction between planning, operations, and maintenance.\n\n - Proven safety leadership and commitment to high mining industry standards and sound engineering practice.\n\n - Strong analytical, problem-solving, and communication skills, with the ability to work effectively with field crews and multidisciplinary teams.\n\nPreferred Qualifications\n\n - Experience with heap-leach operations, leach-pad planning, stacking sequences, and coordination between mining and leaching.\n\n - Experience with autonomous mining equipment, operational data systems, or automation of mine planning and production workflows.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":"$123K – $171K • Offers Equity","scrapeableCompensationSalarySummary":"$123K - $171K","compensationTiers":[{"id":"b9910bf9-dd33-4420-b64f-96d40751f9ce","tierSummary":"$123K – $171K • Offers Equity","title":null,"additionalInformation":null,"components":[{"id":"db9d5c4c-ec1f-4467-a0ef-1be2f73ca627","summary":"$123K – $171K","compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":123000,"maxValue":171000},{"id":"6ea3eba1-d5b9-44e2-bf4f-6e6a6917ddfc","summary":"Offers Equity","compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}],"summaryComponents":[{"compensationType":"Salary","interval":"1 YEAR","currencyCode":"USD","minValue":123000,"maxValue":171000},{"compensationType":"EquityCashValue","interval":"1 YEAR","currencyCode":"USD","minValue":null,"maxValue":null}]}},{"id":"def16159-79d5-45c3-99dc-ca6f7d189d4b","title":"Sr. Planner and Scheduler","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-09T19:55:52.465+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/def16159-79d5-45c3-99dc-ca6f7d189d4b","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/def16159-79d5-45c3-99dc-ca6f7d189d4b/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
We are hiring a Planner/Scheduler to own schedule management for one of Mariana's capital projects, from the Level 1 summary leadership uses to the Level 4 detail the field works from.
You will work with internal teams to build schedules that reflect how they actually plan to execute the work, build and defend the critical path, hold EPC contractors to a clear scheduling standard, and turn progress data into forecasts people can act on. You will also help build the tools behind that work, so leadership and project teams can run what-if scenarios, see where the schedule risk sits, and make decisions with real data in front of them. The goal is a schedule nobody has to second-guess.
What you'll do
Own the integrated schedule. Build and maintain Level 1 through Level 4 critical path schedules in Primavera P6 covering engineering, procurement, fabrication, construction, commissioning, and start-up, and keep them integrated across owner and contractor scopes
Set the structure. Define the work breakdown structure, activity codes, calendars, and resource and cost loading, aligned to the cost breakdown structure so cost and schedule reconcile
Own the critical path. Run critical path, float, and near-critical analysis every cycle, state plainly which activities are driving the date, and recommend recovery options when they slip
Control the baseline. Establish and maintain the baseline, run schedule changes through a documented change process, and keep the variance history intact
Hold contractors to a standard. Review submitted schedules for logic quality, constraints, open ends, and float manipulation using a DCMA-style health check, and work findings to closure
Measure progress. Define rules of credit with cost control, collect and validate progress, and produce S-curves, earned-value inputs, and workhour histograms that match what is happening in the field
Drive the look-ahead process. Run ninety-day, six-week, and weekly look-aheads with construction and commissioning leads, and tie them back to the master schedule
Support risk analysis. Build the schedule model for quantitative schedule risk analysis and translate P50 and P80 results into decisions on contingency and milestones
Report with judgment. Write the monthly schedule narrative, milestone status, and the analysis behind any date change, and present it to project teams. Comfortable presenting to executive leadership
Automate the cycle. Statusing, health checks, and report production are rules-based work. Build, or partner with software engineers to build, the checks and pipelines that turn a weeks-long monthly cycle into hours
Desired qualifications
Experience. 5–12 years planning and scheduling capital projects in mining, mineral processing, refining, chemicals, power, or heavy industrial, with hands-on work on an integrated EPC schedule through construction and commissioning
Primavera P6. Expert and current: building, analyzing, and defending schedules, not only statusing them
Critical path fundamentals. Logic, constraints, calendars, total and free float, and the ability to defend a critical path when it is challenged
Data fluency. Comfortable with P6 data outside the P6 interface: XER and XML exports, SQL, Power BI, or Python, and interested in automating repeatable work
Progress measurement. Experience setting rules of credit and reconciling reported progress against physical work in place
Schedule quality. Working knowledge of the DCMA 14-point assessment or a comparable schedule health standard
Field credibility. You have spent real time on a construction site and can hold a conversation with a superintendent
Education. BS in engineering, construction management, or a related field. Equivalent field planning experience is considered
Certification. PMI Scheduling Professional (PMI-SP) or AACE Planning and Scheduling Professional (PSP) is a plus
Schedule risk tools. Acumen Fuse, Safran Risk, Primavera Risk Analysis, or @Risk
Commissioning and start-up. Planning for commissioning, start-up, and system-based turnover
Delay analysis. Forensic delay analysis, time impact analysis, and extension of time assessment
Schedule ownership. Has owned an integrated EPC schedule end to end, rather than a portion of one
Owner-side experience. Time on the owner's side of the table managing multiple EPC or EPCM contractors
Tool building. A track record of building scripts, apps, or dashboards that automate schedule creation, updating, reporting, or visualization
How you work
Clear communicator. You can explain a critical path to a CFO and a three-week look-ahead to a foreman, in writing and in the room
Independent judgment. You make the call on schedule logic and stand behind it, and you change your mind when the data says so
Constructive challenger. You push back on optimistic dates and weak contractor schedules without damaging the working relationship
Collaborative. You work closely with engineering, procurement, construction, commissioning, and cost control, and treat their input as part of the schedule
Growth-minded. You want more scope, ask for it, and raise the standard of the people around you by sharing what you know
Always removing friction. You notice where a process slows people down, question whether each step needs to exist, then simplify it or automate it
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role\n\nWe are hiring a Planner/Scheduler to own schedule management for one of Mariana's capital projects, from the Level 1 summary leadership uses to the Level 4 detail the field works from.\n\nYou will work with internal teams to build schedules that reflect how they actually plan to execute the work, build and defend the critical path, hold EPC contractors to a clear scheduling standard, and turn progress data into forecasts people can act on. You will also help build the tools behind that work, so leadership and project teams can run what-if scenarios, see where the schedule risk sits, and make decisions with real data in front of them. The goal is a schedule nobody has to second-guess.\n\n\n\nWhat you'll do\n\n - Own the integrated schedule. Build and maintain Level 1 through Level 4 critical path schedules in Primavera P6 covering engineering, procurement, fabrication, construction, commissioning, and start-up, and keep them integrated across owner and contractor scopes\n\n - Set the structure. Define the work breakdown structure, activity codes, calendars, and resource and cost loading, aligned to the cost breakdown structure so cost and schedule reconcile\n\n - Own the critical path. Run critical path, float, and near-critical analysis every cycle, state plainly which activities are driving the date, and recommend recovery options when they slip\n\n - Control the baseline. Establish and maintain the baseline, run schedule changes through a documented change process, and keep the variance history intact\n\n - Hold contractors to a standard. Review submitted schedules for logic quality, constraints, open ends, and float manipulation using a DCMA-style health check, and work findings to closure\n\n - Measure progress. Define rules of credit with cost control, collect and validate progress, and produce S-curves, earned-value inputs, and workhour histograms that match what is happening in the field\n\n - Drive the look-ahead process. Run ninety-day, six-week, and weekly look-aheads with construction and commissioning leads, and tie them back to the master schedule\n\n - Support risk analysis. Build the schedule model for quantitative schedule risk analysis and translate P50 and P80 results into decisions on contingency and milestones\n\n - Report with judgment. Write the monthly schedule narrative, milestone status, and the analysis behind any date change, and present it to project teams. Comfortable presenting to executive leadership\n\n - Automate the cycle. Statusing, health checks, and report production are rules-based work. Build, or partner with software engineers to build, the checks and pipelines that turn a weeks-long monthly cycle into hours\n\nDesired qualifications\n\n - Experience. 5–12 years planning and scheduling capital projects in mining, mineral processing, refining, chemicals, power, or heavy industrial, with hands-on work on an integrated EPC schedule through construction and commissioning\n\n - Primavera P6. Expert and current: building, analyzing, and defending schedules, not only statusing them\n\n - Critical path fundamentals. Logic, constraints, calendars, total and free float, and the ability to defend a critical path when it is challenged\n\n - Data fluency. Comfortable with P6 data outside the P6 interface: XER and XML exports, SQL, Power BI, or Python, and interested in automating repeatable work\n\n - Progress measurement. Experience setting rules of credit and reconciling reported progress against physical work in place\n\n - Schedule quality. Working knowledge of the DCMA 14-point assessment or a comparable schedule health standard\n\n - Field credibility. You have spent real time on a construction site and can hold a conversation with a superintendent\n\n - Education. BS in engineering, construction management, or a related field. Equivalent field planning experience is considered\n\n - Certification. PMI Scheduling Professional (PMI-SP) or AACE Planning and Scheduling Professional (PSP) is a plus\n\n - Schedule risk tools. Acumen Fuse, Safran Risk, Primavera Risk Analysis, or @Risk\n\n - Commissioning and start-up. Planning for commissioning, start-up, and system-based turnover\n\n - Delay analysis. Forensic delay analysis, time impact analysis, and extension of time assessment\n\n - Schedule ownership. Has owned an integrated EPC schedule end to end, rather than a portion of one\n\n - Owner-side experience. Time on the owner's side of the table managing multiple EPC or EPCM contractors\n\n - Tool building. A track record of building scripts, apps, or dashboards that automate schedule creation, updating, reporting, or visualization\n\nHow you work\n\n - Clear communicator. You can explain a critical path to a CFO and a three-week look-ahead to a foreman, in writing and in the room\n\n - Independent judgment. You make the call on schedule logic and stand behind it, and you change your mind when the data says so\n\n - Constructive challenger. You push back on optimistic dates and weak contractor schedules without damaging the working relationship\n\n - Collaborative. You work closely with engineering, procurement, construction, commissioning, and cost control, and treat their input as part of the schedule\n\n - Growth-minded. You want more scope, ask for it, and raise the standard of the people around you by sharing what you know\n\n - Always removing friction. You notice where a process slows people down, question whether each step needs to exist, then simplify it or automate it\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"2cdd0a76-6433-468a-beb6-93114df2e456","title":"Engineering Coordinator ","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-09T23:00:35.853+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/2cdd0a76-6433-468a-beb6-93114df2e456","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/2cdd0a76-6433-468a-beb6-93114df2e456/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is looking for an Engineering Coordinator to help drive the delivery of mineral processing and refinery projects.
As an Engineering Coordinator at Mariana Minerals, you will coordinate schedules, budgets, and documentation across engineering disciplines, keeping design projects on track from concept through construction support.
What You’ll Do
Coordinate schedules, deliverables, and priorities across process, mechanical, electrical, civil, instrumentation, and structural engineering.
Track project costs and budgets.
Maintain project documentation in collaboration with document controllers, including drawing registers, transmittals, RFIs, and design basis documents.
Coordinate document control processes, ensuring deliverables are reviewed, approved, and issued on schedule.
Develop and maintain project schedules in Microsoft Project, tracking milestones and critical-path activities.
Liaise with engineering contractors to track engineering activities.
Prepare progress reports, meeting minutes, and status updates for internal teams and clients.
Identify schedule risks and bottlenecks and help develop mitigation plans.
Develop and implement processes and procedures to improve project coordination and efficiency.
Actively engage in development of Mariana’s internal software tools.
What You’ll Bring
Bachelor’s degree in an engineering discipline or equivalent experience.
5+ years of professional experience.
Experience tracking costs within a project environment.
Proficiency with Microsoft Office tools, especially Excel and Microsoft Project.
Ability to manage multiple projects simultaneously in a deadline-driven environment.
Ability to work effectively with cross-functional teams, manage competing priorities, and support delivery of high-quality engineering packages under schedule constraints.
Preferred Experience
Experience with industrial projects.
Experience developing processes and procedures.
Familiarity with document control or project management platforms.
Experience with procurement including POs, change orders, agreements.
Experience developing software tools.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Role \n\nMariana Minerals is looking for an Engineering Coordinator to help drive the delivery of mineral processing and refinery projects.\n\nAs an Engineering Coordinator at Mariana Minerals, you will coordinate schedules, budgets, and documentation across engineering disciplines, keeping design projects on track from concept through construction support.\n\n\n\nWhat You’ll Do\n\n - Coordinate schedules, deliverables, and priorities across process, mechanical, electrical, civil, instrumentation, and structural engineering.\n\n - Track project costs and budgets.\n\n - Maintain project documentation in collaboration with document controllers, including drawing registers, transmittals, RFIs, and design basis documents.\n\n - Coordinate document control processes, ensuring deliverables are reviewed, approved, and issued on schedule.\n\n - Develop and maintain project schedules in Microsoft Project, tracking milestones and critical-path activities.\n\n - Liaise with engineering contractors to track engineering activities.\n\n - Prepare progress reports, meeting minutes, and status updates for internal teams and clients.\n\n - Identify schedule risks and bottlenecks and help develop mitigation plans.\n\n - Develop and implement processes and procedures to improve project coordination and efficiency.\n\n - Actively engage in development of Mariana’s internal software tools.\n\n\n\nWhat You’ll Bring\n\n - Bachelor’s degree in an engineering discipline or equivalent experience.\n\n - 5+ years of professional experience.\n\n - Experience tracking costs within a project environment.\n\n - Proficiency with Microsoft Office tools, especially Excel and Microsoft Project.\n\n - Ability to manage multiple projects simultaneously in a deadline-driven environment.\n\n - Ability to work effectively with cross-functional teams, manage competing priorities, and support delivery of high-quality engineering packages under schedule constraints.\n\n\n\nPreferred Experience \n\n - Experience with industrial projects.\n\n - Experience developing processes and procedures.\n\n - Familiarity with document control or project management platforms.\n\n - Experience with procurement including POs, change orders, agreements.\n\n - Experience developing software tools.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"558c609c-9d5a-4f52-9e7d-517b28b91598","title":"Senior Safety Engineer","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-13T21:37:00.720+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/558c609c-9d5a-4f52-9e7d-517b28b91598","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/558c609c-9d5a-4f52-9e7d-517b28b91598/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
We are hiring a Senior Safety Engineer to lead ISO 45001 implementation and help our teams solve safety challenges in equipment and facility design. You will establish the system at an initial site, build company policies and procedures that other locations can use, and support integration as Mariana develops new operations.
You will also work closely with Engineering on risk assessments, safety requirements, calculations, and validation. The expected focus is approximately 50% ISO 45001 and OHS management systems, 30% functional safety engineering, and 20% general safety engineering support. You will spend time with the people doing the work and turn technical requirements into solutions they can use.
Lead the ISO 45001 gap assessment and implementation plan, with clear priorities, owners, milestones, and evidence of completion.
Develop practical OHS policies and procedures; involve workers, coach process owners, and build consistent systems that future sites can adopt.
Coordinate internal audits, compliance evaluations, management reviews, corrective actions, and certification readiness. Maintain usable documents, records, and performance measures.
Support new locations through design, construction, commissioning, and operations, adapting the company framework to local hazards and requirements.
Lead or support equipment risk assessments and design reviews for fixed/mobile equipment and other systems, including safeguarding, interlocks, emergency stops, and operating modes.
Define safety functions and requirements; perform and review assigned performance level or safety integrity level calculations and document their assumptions.
Develop and execute verification and validation activities, maintain traceability, and assess changes that require revalidation. Arrange specialist analysis and independent review where needed.
Provide engineering input on facility and fire or life safety questions with qualified design specialists, and support commissioning, hazardous energy isolation, and startup reviews.
Support incident investigations, field risk assessments, training, and other H&S improvements with site teams and the PSM Engineer. Follow actions through to verified closure.
Provide general safety engineering support
Contribute to design and commissioning reviews, hazardous energy isolation, incident investigations, and practical improvements with site H&S and the PSM Engineer.
Support facility and fire and life safety questions with project teams and qualified design specialists. Explain requirements clearly, propose workable options, and follow issues through to resolution.
Typically 7+ years of relevant safety engineering, industrial engineering, or OHS experience, including substantial responsibility for ISO 45001 implementation in an industrial setting.
Approximately 3–5 years of hands-on functional safety or safety-related control-system experience within your broader career, including risk assessments, safety requirements, calculations, and testing.
Applied knowledge of ISO 45001 and familiarity with other OHS management systems, such as ANSI/ASSP Z10 or ILO-OSH 2001, plus relevant audit and implementation guidance.
Experience applying machinery risk assessment and functional safety methods, including ISO 12100 and ISO 13849 or IEC 62061 as appropriate. Ability to read engineering drawings and control narratives and explain the basis for a safety calculation.
Strong technical writing, facilitation, and project delivery skills. You can work through design disagreements, coach teams, and take ownership of closing gaps.
Sound judgment about applicable safety requirements and the limits of your expertise, with the ability to bring in the right specialist and keep work moving.
Preferred qualifications
A bachelor’s degree in mechanical, electrical, mechatronics, controls, systems, industrial, safety, or a closely related engineering discipline is strongly preferred. Equivalent demonstrated engineering experience will also be considered.
Experience taking a site through ISO 45001 certification, recognized lead-auditor training, or deployment of common systems across multiple locations.
Experience in mining, mineral processing, chemicals, manufacturing, or comparable operations; familiarity with SISTEMA, safety PLCs, or automated equipment. Relevant functional safety training or a CSP credential is valuable.
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\n\nTHE ROLE\n\nWe are hiring a Senior Safety Engineer to lead ISO 45001 implementation and help our teams solve safety challenges in equipment and facility design. You will establish the system at an initial site, build company policies and procedures that other locations can use, and support integration as Mariana develops new operations.\n\nYou will also work closely with Engineering on risk assessments, safety requirements, calculations, and validation. The expected focus is approximately 50% ISO 45001 and OHS management systems, 30% functional safety engineering, and 20% general safety engineering support. You will spend time with the people doing the work and turn technical requirements into solutions they can use.\n\n\n\n\nWHAT YOU'LL DO\n\n - Lead the ISO 45001 gap assessment and implementation plan, with clear priorities, owners, milestones, and evidence of completion.\n\n - Develop practical OHS policies and procedures; involve workers, coach process owners, and build consistent systems that future sites can adopt.\n\n - Coordinate internal audits, compliance evaluations, management reviews, corrective actions, and certification readiness. Maintain usable documents, records, and performance measures.\n\n - Support new locations through design, construction, commissioning, and operations, adapting the company framework to local hazards and requirements.\n\n - Lead or support equipment risk assessments and design reviews for fixed/mobile equipment and other systems, including safeguarding, interlocks, emergency stops, and operating modes.\n\n - Define safety functions and requirements; perform and review assigned performance level or safety integrity level calculations and document their assumptions.\n\n - Develop and execute verification and validation activities, maintain traceability, and assess changes that require revalidation. Arrange specialist analysis and independent review where needed.\n\n - Provide engineering input on facility and fire or life safety questions with qualified design specialists, and support commissioning, hazardous energy isolation, and startup reviews.\n\n - Support incident investigations, field risk assessments, training, and other H&S improvements with site teams and the PSM Engineer. Follow actions through to verified closure.\n\nProvide general safety engineering support\n\n - Contribute to design and commissioning reviews, hazardous energy isolation, incident investigations, and practical improvements with site H&S and the PSM Engineer.\n\n - Support facility and fire and life safety questions with project teams and qualified design specialists. Explain requirements clearly, propose workable options, and follow issues through to resolution.\n\n\n\n\nQUALIFICATIONS\n\n - Typically 7+ years of relevant safety engineering, industrial engineering, or OHS experience, including substantial responsibility for ISO 45001 implementation in an industrial setting.\n\n - Approximately 3–5 years of hands-on functional safety or safety-related control-system experience within your broader career, including risk assessments, safety requirements, calculations, and testing.\n\n - Applied knowledge of ISO 45001 and familiarity with other OHS management systems, such as ANSI/ASSP Z10 or ILO-OSH 2001, plus relevant audit and implementation guidance.\n\n - Experience applying machinery risk assessment and functional safety methods, including ISO 12100 and ISO 13849 or IEC 62061 as appropriate. Ability to read engineering drawings and control narratives and explain the basis for a safety calculation.\n\n - Strong technical writing, facilitation, and project delivery skills. You can work through design disagreements, coach teams, and take ownership of closing gaps.\n\n - Sound judgment about applicable safety requirements and the limits of your expertise, with the ability to bring in the right specialist and keep work moving.\n\n\n\nPreferred qualifications\n\n - A bachelor’s degree in mechanical, electrical, mechatronics, controls, systems, industrial, safety, or a closely related engineering discipline is strongly preferred. Equivalent demonstrated engineering experience will also be considered.\n\n - Experience taking a site through ISO 45001 certification, recognized lead-auditor training, or deployment of common systems across multiple locations.\n\n - Experience in mining, mineral processing, chemicals, manufacturing, or comparable operations; familiarity with SISTEMA, safety PLCs, or automated equipment. Relevant functional safety training or a CSP credential is valuable.\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"d34c8f5c-b4a3-49e6-93b9-98b5d58db4c9","title":"Driller Assistant (Helper)","department":"Plant Operations","team":"Plant Operations","employmentType":"FullTime","location":"Moab, UT","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-12T16:45:37.574+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Utah","addressCountry":"United States","addressLocality":"Moab"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/d34c8f5c-b4a3-49e6-93b9-98b5d58db4c9","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/d34c8f5c-b4a3-49e6-93b9-98b5d58db4c9/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Driller Assistant works alongside the Driller to support drilling for mineral exploration and resource definition at our open-pit copper mine. The role focuses on safe rig operations, careful core handling and recovery, equipment care, and following health, safety and environmental standards. Experience with reverse circulation (RC), air rotary or water-well drilling carries over well. It's a strong entry point for anyone looking to build a career toward Driller. Help us build the world's first fully autonomous mine.
Responsibilities
Help the Driller safely set up, move and tear down the drill rig and drill pad
Handle rods, core barrels, casing and tooling while tripping in and out of the hole
Pull, clean, measure, label and box core accurately, with good contamination control
Mix and manage drilling fluids, and maintain water lines, pumps and supply systems
Do pre-start inspections, greasing, lubrication and basic maintenance on the rig, compressors, pumps and support equipment
Help keep drill logs, footage drilled, consumables used and daily reports
Keep an inventory of bits and supplies, and let the Driller know when stock is low
Recognize changes in ground conditions and flag them to the Driller and geologist
Keep the drill pad and equipment area clean and organized
Handle equipment breakdowns and emergencies with a calm, safety-first approach
Qualifications
Experience as a driller's helper, offsider or rig hand, or comparable hands-on field, construction or mechanical work
Diamond core, reverse circulation (RC) or water-well drilling experience is a plus
Strong mechanical aptitude and willingness to learn drilling techniques and equipment
Real commitment to safety and following procedures
Valid driver's license; CDL is a plus
Schedule
7 days on / 7 days off, 12-hour day shifts
Working Environment & Physical Requirements
Work 12-hour shifts outdoors on drill pads and rugged terrain, in all weather and extreme temperatures
Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel
Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nThe Driller Assistant works alongside the Driller to support drilling for mineral exploration and resource definition at our open-pit copper mine. The role focuses on safe rig operations, careful core handling and recovery, equipment care, and following health, safety and environmental standards. Experience with reverse circulation (RC), air rotary or water-well drilling carries over well. It's a strong entry point for anyone looking to build a career toward Driller. Help us build the world's first fully autonomous mine.\n\nResponsibilities\n\n - Help the Driller safely set up, move and tear down the drill rig and drill pad\n\n - Handle rods, core barrels, casing and tooling while tripping in and out of the hole\n\n - Pull, clean, measure, label and box core accurately, with good contamination control\n\n - Mix and manage drilling fluids, and maintain water lines, pumps and supply systems\n\n - Do pre-start inspections, greasing, lubrication and basic maintenance on the rig, compressors, pumps and support equipment\n\n - Help keep drill logs, footage drilled, consumables used and daily reports\n\n - Keep an inventory of bits and supplies, and let the Driller know when stock is low\n\n - Recognize changes in ground conditions and flag them to the Driller and geologist\n\n - Keep the drill pad and equipment area clean and organized\n\n - Handle equipment breakdowns and emergencies with a calm, safety-first approach\n\nQualifications\n\n - Experience as a driller's helper, offsider or rig hand, or comparable hands-on field, construction or mechanical work\n\n - Diamond core, reverse circulation (RC) or water-well drilling experience is a plus\n\n - Strong mechanical aptitude and willingness to learn drilling techniques and equipment\n\n - Real commitment to safety and following procedures\n\n - Valid driver's license; CDL is a plus\n\nSchedule\n\n - 7 days on / 7 days off, 12-hour day shifts\n\nWorking Environment & Physical Requirements\n\n - Work 12-hour shifts outdoors on drill pads and rugged terrain, in all weather and extreme temperatures\n\n - Lift at least 50 lbs, with exposure to dust, noise, vibration and diesel\n\n - Wear all required PPE (hard hat, steel toes, safety glasses, hi-vis, hearing protection, and a respirator when required)\n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}},{"id":"f6cfb78e-353b-4d59-96d9-65ff688ca547","title":"Sr. Piping Designer ","department":"Project & Construction Management","team":"Project & Construction Management","employmentType":"FullTime","location":"Houston, TX","shouldDisplayCompensationOnJobPostings":false,"secondaryLocations":[],"publishedAt":"2026-10-12T21:53:49.717+00:00","isListed":true,"isRemote":false,"workplaceType":"OnSite","address":{"postalAddress":{"addressRegion":"Texas","addressCountry":"US","addressLocality":"Houston"}},"jobUrl":"https://jobs.ashbyhq.com/marianaminerals/f6cfb78e-353b-4d59-96d9-65ff688ca547","applyUrl":"https://jobs.ashbyhq.com/marianaminerals/f6cfb78e-353b-4d59-96d9-65ff688ca547/application","descriptionHtml":"Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
Role Overview
We are hiring Piping Design Engineers to rebuild how piping design is done.
Piping is one of the largest cost and schedule drivers in a refinery, and one of the least automated disciplines in engineering. The workflow has barely changed in thirty years: someone routes a line by hand in a 3D model, someone else checks it by eye, and the quantities get counted downstream after the fact. The tooling available today, modeling software, geometry and CAD APIs, and modern AI coding assistants, has moved far enough that a large share of that work should be generated, checked, and optimized by software.
That is the job. You will do the real design work including layout, routing, supports, stress, isometrics, quantities. And then go after the parts of it that should never have been manual. You will write the checks, build the scripts, and stand up the workflows that let a small team model a plant that would normally take an army of designers.
What You’ll Do
Build the 3D model. Plot plans, equipment layout, line routing, supports, and issued-for-construction isometrics in AutoCAD Plant 3D
Draft the process documents. PFDs and smart P&IDs, plus Plant 3D project setup. Data Manager, spec catalogs, templates, and isometric configuration.
Carry lines from P&ID to IFC. Spec compliance, clash-free routing, operability and maintenance access, and vent, drain, and hydrotest details
Produce the quantities. Bills of material and take-offs generated from the model
Squad check, comment resolution, and multidiscipline model reviews with process, mechanical, structural, and electrical
Find the waste. Identify which parts of the workflow are repetitive, error-prone, or checked by eye, and make the case for automating them
Script the repetitive work. Spec and standards checks, bulk model edits, attribute and tag cleanup, quantity reporting, and clash triage
Build with AI coding tools. Use vibe coding tools to get from idea to working tool in days, and use version control so other people can run what you built
Connect the data. P&ID data, line lists, stress inputs, and procurement quantities moving between systems, so numbers are derived rather than retyped
Prototype the next workflow. Rules-driven routing, automated support placement, automated drawing and isometric checks, and model QC that runs continuously instead of at milestones
What You’ll Bring
Technical depth. You reason from first principles about geometry, loads, and flow instead of pattern-matching to the last project
3D design fluency. Real models and assemblies in a serious CAD environment. SolidWorks, Inventor, NX, CATIA, or Creo, or plant tools like AutoCAD Plant 3D, CADWorx, E3D, or SP3D
An automation instinct, with evidence. You have looked at a repetitive engineering task, decided it should be scripted, and actually tried
Willingness to build software with modern AI coding tools. No programming background required. You do need to be the engineer who picks up Claude Code or Cursor and ships something useful in the first month
Excitement about a new way of working. If the best answer for why a workflow exists is that it has always been done that way, this is not the right role
Judgment about when to automate. And when a script is a distraction from getting the design out the door
Clear writing. You will be documenting workflows other people follow
Education. BS in Mechanical Engineering or a closely related field. New graduates are welcome. Equivalent hands-on design experience works in place of the degree
Everyone Gets Home Safe. We never put speed or cost ahead of people.
Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply!
","descriptionPlain":"ABOUT MARIANA MINERALS\n\nMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.\n\nRole Overview\n\nWe are hiring Piping Design Engineers to rebuild how piping design is done.\n\nPiping is one of the largest cost and schedule drivers in a refinery, and one of the least automated disciplines in engineering. The workflow has barely changed in thirty years: someone routes a line by hand in a 3D model, someone else checks it by eye, and the quantities get counted downstream after the fact. The tooling available today, modeling software, geometry and CAD APIs, and modern AI coding assistants, has moved far enough that a large share of that work should be generated, checked, and optimized by software.\n\nThat is the job. You will do the real design work including layout, routing, supports, stress, isometrics, quantities. And then go after the parts of it that should never have been manual. You will write the checks, build the scripts, and stand up the workflows that let a small team model a plant that would normally take an army of designers.\n\n \n\nWhat You’ll Do\n\n - Build the 3D model. Plot plans, equipment layout, line routing, supports, and issued-for-construction isometrics in AutoCAD Plant 3D\n\n - Draft the process documents. PFDs and smart P&IDs, plus Plant 3D project setup. Data Manager, spec catalogs, templates, and isometric configuration.\n\n - Carry lines from P&ID to IFC. Spec compliance, clash-free routing, operability and maintenance access, and vent, drain, and hydrotest details\n\n - Produce the quantities. Bills of material and take-offs generated from the model\n\n - Squad check, comment resolution, and multidiscipline model reviews with process, mechanical, structural, and electrical\n\n - Find the waste. Identify which parts of the workflow are repetitive, error-prone, or checked by eye, and make the case for automating them\n\n - Script the repetitive work. Spec and standards checks, bulk model edits, attribute and tag cleanup, quantity reporting, and clash triage\n\n - Build with AI coding tools. Use vibe coding tools to get from idea to working tool in days, and use version control so other people can run what you built\n\n - Connect the data. P&ID data, line lists, stress inputs, and procurement quantities moving between systems, so numbers are derived rather than retyped\n\n - Prototype the next workflow. Rules-driven routing, automated support placement, automated drawing and isometric checks, and model QC that runs continuously instead of at milestones\n\n \n\nWhat You’ll Bring\n\n - Technical depth. You reason from first principles about geometry, loads, and flow instead of pattern-matching to the last project\n\n - 3D design fluency. Real models and assemblies in a serious CAD environment. SolidWorks, Inventor, NX, CATIA, or Creo, or plant tools like AutoCAD Plant 3D, CADWorx, E3D, or SP3D\n\n - An automation instinct, with evidence. You have looked at a repetitive engineering task, decided it should be scripted, and actually tried\n\n - Willingness to build software with modern AI coding tools. No programming background required. You do need to be the engineer who picks up Claude Code or Cursor and ships something useful in the first month\n\n - Excitement about a new way of working. If the best answer for why a workflow exists is that it has always been done that way, this is not the right role\n\n - Judgment about when to automate. And when a script is a distraction from getting the design out the door\n\n - Clear writing. You will be documenting workflows other people follow\n\n - Education. BS in Mechanical Engineering or a closely related field. New graduates are welcome. Equivalent hands-on design experience works in place of the degree\n\n \n\n\nOUR CULTURE IS BUILT ON FOUR PRINCIPLES:\n\n\n\nEveryone Gets Home Safe. We never put speed or cost ahead of people.\n\nExtreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.\n\nEngineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.\n\nShare Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.\n\n\n\nJoin us as we build the future of responsible mineral sourcing and supply!","compensation":{"compensationTierSummary":null,"scrapeableCompensationSalarySummary":null,"compensationTiers":[],"summaryComponents":[]}}],"apiVersion":"1"}