Sr/Staff Electrical Engineer

About the Role

We are hiring a Senior / Staff Electrical Engineer to own the medium and low-voltage power systems behind our refining and minerals processing facilities. From the incoming service point through the MV substations, e-houses, MCCs, and drives, down to the last motor and panelboard. You will set the electrical design basis for each facility and work both sides of the line — self-performing the studies and packages that decide how the plant gets built, while reviewing and approving detailed engineering deliverables from third-party engineering firms. You will carry this through procurement, fieldwork, commissioning, and energization.

Responsibilities

• Own the MV/LV design basis, including voltage levels, system grounding, fault levels, load segregation, redundancy, and standby power.
• Build and maintain the plant load list from process and mechanical equipment lists, carrying it through concept and detailed design.
• Size and configure the distribution: MV switchgear, unit substations, e-houses, PDCs, MCCs, LV switchboards, and branch distribution down to the loads.
• Build and maintain the ETAP model of each plant as the single source of truth, keeping it current as loads evolve.
• Write datasheets and technical specifications for MV switchgear, unit substations, transformers, MCCs, LV and MV VFDs, UPS and DC systems, and modular e-houses.
• Lead procurement, including technical bid evaluation, vendor drawing review, FAT witness, and early management of long-lead equipment.
• Write the electrical scope of work in third-party engineering contracts and review/approve deliverables.
• Self-perform packages that are faster or better done in-house.
• Classify hazardous areas for hydromet, pyromet, and reagent handling, designing equipment accordingly.
• Coordinate across multi-disciplinary detailed engineering phases.
• Support construction and commissioning: RFI resolution, field changes, insulation resistance and hipot testing, relay injection, NETA ATS acceptance testing, and MCC/drive functional checks.
• Write energization plans and switching procedures, phase energization through a plant still under construction, and close out with as-builts, setting files, and turnover packages.

Requirements

• 8+ years designing MV and LV power distribution for industrial process facilities, delivered in an EPC, owner’s-engineer, or capital projects environment.
• Hands-on modeling in ETAP (preferred), SKM PowerTools, or EasyPower.
• Depth in core studies: load flow, short circuit, motor starting, protective coordination, and arc flash.
• Specification and procurement track record on MV switchgear, unit substations, transformers, MCCs, VFDs, and e-houses.
• Fluency in NEC, IEEE, NFPA 70E, and hazardous area classification.
• Comfortable both redlining EPC deliverables and producing them yourself when faster.
• Bachelor of Science in Electrical Engineering. PE strongly preferred.

About Us

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.

Our culture is built on three principles:

• Everyone Gets Home Safe. We never put speed or cost ahead of people.
• Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.
• Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.
• Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.

Pay

Compensation Range: $140K - $210K