# Sr./Staff Process Engineer - Detailed Engineering and Plant Design 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: Senior
- Location: Houston, TX
- Work setup: On-site
- Posted: 2026-09-10
- Apply by: 2026-10-25
- Apply: https://jobs.ashbyhq.com/marianaminerals/ba0c38ee-f709-44be-92cb-f6f41f9d6013
- Page: https://www.1752.vc/careers/jobs/mariana-minerals-sr-staff-process-engineer-detailed-engineering-and-plant-design/

## About the role

We are hiring a Senior / Staff Process Engineer to execute detailed engineering deliverables such as P&IDs, line and instrument and valve lists, control narratives, hydraulic models, equipment and bulk specifications, and the procurement packages behind them. Mariana executes process engineering in-house, you will produce these deliverables yourself, own their technical content and revision history, and carry them through procurement, construction, and commissioning.

## What they're looking for

- 8+ years of process engineering delivering detailed design for industrial process facilities — in an EPC/EPCM, owner’s engineer, or in-house capital projects environment
- Detailed-engineering cycle on at least one greenfield or major brownfield project
- BS in Chemical, Metallurgical, or Process Engineering. PE preferred
- Lithium — direct lithium extraction, spodumene leaching, crystallization, and battery-grade product specifications
- Copper — heap and tank leaching, solvent extraction and electrowinning, tankhouse and electrolyte circuits
- Slurry and solids handling — thickeners, filters, pulp and tailings piping, and settling and erosion design

Tags: Engineering