# 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: 2026-10-14
- Apply by: 2026-11-28
- Apply: https://jobs.ashbyhq.com/marianaminerals/b03fb27c-9697-4ec3-9821-4785379cd172?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/mariana-minerals-sr-staff-process-engineer-detailed-engineering-and-plant-design-2/

## 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. Found on 1752vc Careers, the job board for startup and VC roles.

## 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: Process Development

Source: 1752vc Careers, https://www.1752.vc/careers/jobs/mariana-minerals-sr-staff-process-engineer-detailed-engineering-and-plant-design-2/