Mechanical Engineer

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 Mechanical Engineer 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** - Drive design, fabrication, installation, modification, startup, and commissioning of new equipment and pilot plant systems. - Troubleshoot mechanical issues and implement practical solutions to maintain safe, reliable, and efficient plant operations. - Work closely with process engineers and R&D scientists to translate process requirements into equipment modifications, mechanical designs, and plant improvements. - Create and maintain engineering documentation, including P&IDs, process and control narratives, equipment specifications, drawings, CAD models, and equipment manuals. - Identify opportunities to improve equipment reliability, maintainability, and operational performance - Support the development of software and to help drive rapid equipment design, plant reliability, and safe operation - Travel to Mariana sites to support new projects, start-up/commissioning, and troubleshooting initiatives ## **What You'll Bring** - B.S., M.S., or PhD in Mechanical Engineering or a related field - Experience in automated manufacturing, 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 - Ability to wear multiple hats and take on additional scope in areas such as process engineering, operations, maintenance, 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 and managing ambiguity ## **Our culture is built on four principles:** **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!**