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Mechanical Engineering Intern

Mariana Minerals - San Francisco HQ, San Francisco, California, US

Posted Apr 14, 2026

Benefits

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Weekend work
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About this role

Mechanical Engineering Intern San Francisco HQ, San Francisco, California, US 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 We are hiring a Mechanical Engineering Intern to work on real, high-impact problems within the Pilot Plant Operations team in San Francisco. You will contribute directly to design, improvement, and optimization of benchtop pilot plant equipment, working closely with engineers and domain experts. This role is designed to provide hands-on experience building and shipping solutions, not just supporting tasks. What You'll Do - Create 3D models, layout drawings, and other critical documentation for equipment in the lab and pilot plant - Build, test, and iterate on hands-on mechanical solutions to improve equipment performance, decrease equipment downtime, controls costs, and improve health & safety - Collaborate with engineering, management, and software engineering to build programs and applications for Mariana's operations teams - Collaborate with cross-functional team members (engineering, operations, controls engineering, etc) - Present outcomes and learnings at the end of the internship Desired Qualifications - Currently pursuing or recently completed degree in mechanical engineering or a related field - Strong fundamentals in mechanical design documentation such as equipment specifications, layout drawings, piping schematics, and CAD models - Hands-on experience designing or supporting industrial equipment including pumps, piping systems, reactors, separators, filtration systems, and

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