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.
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
More about this role
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 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.
Own the process design basis for your assigned areas. Design cases and margins, turndown, utility and reagent demands, and the first principles and assumptions basis behind them
Develop PFDs, heat and material balances, and P&IDs. Manage the metadata behind smart drafting and modeling software such as Plant 3D
Develop P&IDs from concept through IFC. Including, but not limited to, equipment,...
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