# Mechanical Engineer at Mariana Minerals

- Company: Mariana Minerals
- What the company does: Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies. Backed by Khosla and a16z.
- Company website: https://marianaminerals.com/
- Type: Startups
- Level: Mid level
- Location: San Francisco HQ
- Work setup: On-site
- Pay: $100K to $150K base salary per year (USD)
- Posted: 2026-09-02
- Apply by: 2026-10-17
- Apply: https://jobs.ashbyhq.com/marianaminerals/3fa2126a-adfb-444c-a3ad-76d0305074da
- Page: https://www.1752.vc/careers/jobs/mariana-minerals-mechanical-engineer/

## About 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.

Tags: Process Development