Mechanical Engineering Intern

Mariana Minerals • San Francisco, CA

1d • Onsite

About The Position

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.
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.

Requirements

• 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 material handling equipment
• Ability to design mechanical solutions, troubleshoot problems, and analyze complex datasets independently
• Excellent technical writing, communication, and teamwork skills
• Comfortable working in fast-paced environments, wearing multiple hats, and managing ambiguity

Responsibilities

• 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

What This Job Offers

• Career Level: Intern