Sr/Staff Electrical Engineer

Mariana Minerals; San Francisco (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Mariana Minerals seeks a Senior/Staff Electrical Engineer to own MV/LV power systems for its refining and minerals processing facilities in San Francisco Bay Area. You will set the electrical design basis and perform studies, then review third-party deliverables while self-performing critical packages through procurement, field, commissioning, and energization.

You will lead design against NEC/IEEE/NFPA 70E standards, build ETAP models, and manage long-lead equipment procurement.

Qualifications

• 8+ years designing MV/LV power distribution for industrial process facilities (EPC/owner’s engineer).
• Hands-on ETAP, SKM PowerTools, or EasyPower modeling.
• Deep knowledge of load flow, short circuit, motor starting, protective coordination, and arc flash.
• Specification and procurement of MV switchgear, unit substations, transformers, MCCs, VFDs, and e-houses.
• Fluency in NEC, IEEE, NFPA 70E and hazardous-area classification.
• Able to redline EPC deliverables and produce them in-house when faster.
• Bachelor of Science Electrical Engineering; PE strongly preferred.

Responsibilities

• Own MV/LV design basis including voltage levels, grounding, fault levels, redundancy, and standby power.
• Build and maintain plant load list and carry through from concept to detailed design.
• Size and configure distribution: MV switchgear, substations, e-houses, MCCs, LV/MV VFDs, UPS, DC systems.
• Maintain ETAP model as single source of truth; update with load changes.
• Prepare datasheets and specs for MV/LV equipment.
• Lead procurement: technical bid eval, vendor drawing reviews, FAT, long-lead management.
• Write electrical scope of work for third-party contracts and review deliverables.
• Self-perform packages when advantageous; coordinate across multi-disciplinary phases.
• Classify hazardous areas and design equipment accordingly.
• Support construction/commissioning: RFI resolution, testing, and turnover packages.
• Write energization plans and switching procedures for energized plant commissioning.

Skills

MV/LV power design

ETAP modeling

Load flow and protection coordination

Procurement and specs

NEC/IEEE/NFPA 70E

EPC/Owner's engineer experience

PE preferred

Education

Bachelor of Science Electrical Engineering

Professional Engineer (PE) preferred

Tools

ETAP

SKM PowerTools

EasyPower

Job description

About Mariana Minerals

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.

Role Overview

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 then 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 that through procurement, into the field, and out through commissioning and energization.

What You’ll Do

• Own the MV/LV design basis. 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, and carry it through concept and detailed design
• Size and configure the distribution. Main MV switchgear, unit substations, e-houses and 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, and keep it current as loads move
• 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 the long-lead equipment
• Write the electrical scope of work in our third party engineering contracts, and review and approve deliverables
• Self-perform the packages that are faster or better done in-house
• Classify hazardous areas for hydromet, pyromet, and reagent handling areas, and design equipment accordingly
• Coordinate across multi-disciplinary detailed engineering phases
• Support construction and commissioning. RFI resolution and field changes, insulation resistance and hipot, relay injection, NETA ATS acceptance testing, and MCC and 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

What You’ll Bring

• 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 the 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 in hazardous area classification
• Comfortable both redlining EPC deliverables and producing them yourself when that is faster
• Bachelor of Science Electrical Engineering. PE strongly preferred

Our culture is built on four 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.

Join us as we build the future of responsible mineral sourcing and supply!

Compensation Range: $140K - $210K