Role Overview
Marianaminerals is hiring a Engineering Technician. This is a full-time role in San Francisco HQ. posted 3 weeks ago. 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.
THE ROLE
Mariana Minerals is looking for a highly motivated Engineering Technician to join the San Francisco Pilot Plant team. You will support the design, deployment, and operation of first-of-its-kind refining processes for critical minerals, while also supporting development of software for automated plant optimization. This position is highly hands-on and will play a critical role in bridging R&D, Process Engineering, and Operations, ensuring processes are robust, safe, cost-effective, and suitable for commercial production.
WHAT YOU’LL DO
- Support bench-top R&D, pilot-scale experiments, technical evaluations, and other scale-up trials
- Monitor, troubleshoot, and optimize equipment performance.
- Drive evaluations of recovery, throughput, product quality, and equipment reliability.
- Assist with equipment design, installation, commissioning, and modification
- Create SOPs, engineering drawings, and other process design documentation
- Train on all pilot plant operating steps and fill in when needed to help keep pilot plant running to plan
DESIRED QUALIFICATIONS
- Bachelor’s degree in engineering, materials science, or equivalent field
- 3+ years of hands-on pilot plant, R&D scale-up, or industrial operations experience
- Experience supporting experiments, process trials, or equipment testing
- Ability to collect quality data, document observations, and communicate results clearly
- Experience with process equipment design, procurement, setup, and troubleshooting
- Strong understanding of pH, inorganic chemistry, mass balance, fluid handling, and solid-liquid separation
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 Engineering 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 Engineering 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 Engineering 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 Engineering Technician role at Marianaminerals posted?
This role was posted on June 16, 2026 (23 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.
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