Sr./Staff Process Engineer - Detailed Engineering and Plant Design

The role

The Senior / Staff Process Engineer will execute detailed engineering deliverables including P&IDs, hydraulic models, and equipment specifications. You will own technical content from design through procurement, construction, and commissioning.

What you will do

• Own the process design basis for assigned areas
• Develop PFDs, heat and material balances, and P&IDs
• Manage metadata for smart drafting and modeling software
• Develop P&IDs from concept through IFC
• Manage and develop automated workflows for process data
• Build and maintain hydraulic models
• Size and specify process equipment
• Write control narratives and functional descriptions
• Represent process in PHAs and HAZOP
• Coordinate across detailed engineering disciplines

Required qualifications

• 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

Nice to have

• PE
• 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
• Data-centric P&ID platforms — SmartPlant P&ID, AVEVA P&ID, or Plant 3D P&ID

About the company

Mariana Minerals is a software-first, vertically integrated minerals company. They aim to supply critical minerals for energy, AI, and defense technologies by combining industry expertise with advanced software and automation.