Role Overview
Marianaminerals is hiring a entry-level Mechanical Maintenance Technician. This is a full-time role in San Francisco HQ. posted last week. Full responsibilities, required qualifications, and the apply link are listed in the description below.
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Job description
ABOUT MARIANA MINERALS
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 MARIANA MINERALS
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 Mechanical Maintenance Technician to join our San Francisco Pilot Plant team. You will support the design, installation, and maintenance of first-of-its-kind refining processes for critical minerals. This position plays a critical role in bridging R&D and Operations, ensuring our equipment and work processes are robust, safe, cost-effective, and suitable for commercial production.
WHAT YOU’LL DO
- Perform preventive and corrective maintenance on plant equipment including pumps, valves, piping systems, filtration units, and other process equipment.
- Troubleshoot and repair mechanical issues to maintain safe and reliable plant operations.
- Assist with fabrication, installation, modification, startup, and commissioning of new equipment and pilot plant systems.
- Read and interpret engineering drawings, P&IDs, and equipment manuals to support maintenance and installation work.
- Safely perform maintenance activities following plant safety procedures including Lockout/Tagout (LOTO), hot work permitting, and confined space entry.
- Identify and maintain critical spare parts for the pilot plant
- Champion the site Computerized Maintenance Management System (CMMS) system
DESIRED QUALIFICATIONS
- Associate degree, technical certificate, or equivalent hands-on experience in industrial maintenance, mechanical technology, millwright work, or a related field.
- 3+ years of experience maintaining industrial or pilot-scale equipment in the minerals processing, chemicals, specialty materials, oil & gas, biotech, or similar industries.
- Hands-on experience with maintenance tasks such as pump repair, valve replacement, and instrument troubleshooting
- Hands-on experience fabricating, modifying, and/or constructing industrial equipment
- Familiarity with core plant safety practices including Lockout/Tagout (LOTO), hot work permits, confined space entry, and safe work permitting systems.
- Ability to read and interpret engineering drawings such as P&IDs, equipment diagrams, and mechanical layouts.
- Experience documenting maintenance activities using CMMS or maintenance tracking systems.
- Experience working with rotating equipment, filtration systems, and industrial piping is a plus.
- Ability to climb stairs, stand for extended periods of time, and safely lift up to 50 lbs.
WHY JOIN US?
At Mariana Minerals, you’ll be part of a mission-driven team reshaping the way critical minerals are sourced and supplied globally. You’ll have the autonomy to make big decisions, the tools to innovate, and a culture that values ownership, smart automation, and collaboration.
OUR CULTURE IS BUILT ON THREE PRINCIPLES:
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.
Mariana is an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other protected status.
OUR CULTURE IS BUILT ON THREE PRINCIPLES:
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.
About Marianaminerals
Marianaminerals
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Frequently Asked Questions
How do I apply for the Mechanical Maintenance Technician position at Marianaminerals?
Use the Apply button above to submit your application directly to Marianaminerals. Most applications take less than 5 minutes if your resume and contact details are ready, and you'll be routed to the employer's official application system to finish.
Where is the Mechanical Maintenance Technician position at Marianaminerals located?
This position is based in San Francisco HQ. Marianaminerals has not indicated remote or hybrid options for this role, so candidates should plan for on-site work.
What does a Mechanical Maintenance Technician at Marianaminerals earn?
Marianaminerals has not disclosed a salary range in this posting. Many employers share specifics later in the interview process; you can also ask during a recruiter screen if compensation transparency is important to you.
When was the Mechanical Maintenance Technician role at Marianaminerals posted?
This role was posted on July 2, 2026 (7 days ago). It's still listed as actively hiring; we re-confirm openings against the source system multiple times per day and remove closed roles.
Is the Mechanical Maintenance Technician role at Marianaminerals entry-level?
Yes. This is an entry-level position. Strong candidates typically have 0-2 years of relevant work experience, internships, or significant project work. Read the full description for any specific qualification requirements Marianaminerals has listed.
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