Engineering Technician

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.