---
title: 'Sr/Staff Electrical Engineer at Mariana Minerals'
canonical: 'https://feeny.ai/job/sr-staff-electrical-engineer-mariana-minerals-san-francisco-zkj0pgy4kw0x'
type: 'job'
last_seen: '2026-09-11'
---

# Sr/Staff Electrical Engineer at Mariana Minerals

- **Company:** Mariana Minerals
- **Location:** San Francisco, CA
- **Compensation:** $140k–$210k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-05-28
- **Last confirmed live:** 2026-09-11
- **Apply:** https://jobs.ashbyhq.com/marianaminerals/0f7487f1-7396-4bd1-8339-66615e10b94a/application

**Skills:** Electrical engineering design, Power system modeling, ETAP, SKM PowerTools, EasyPower, NEC, IEEE, NFPA 70E, ANSI/IEC standards, Single-line diagrams, Protective device coordination, Arc flash hazard assessment

> Lead the design and implementation of high, medium, and low voltage power distribution systems for critical mineral infrastructure projects. Perform power system studies, select electrical equipment, and support construction and commissioning efforts.

## 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!

## About Mariana Minerals

## Company Overview
- **One-liner**: Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies.
- **Entity Type**: Private (Series A, $85M funding in July 2025)
- **Headquarters**: San Francisco, California, United States
- **Founded**: Not publicly available
- **Founders**: Turner Caldwell (Co-Founder & CEO)

## Core Business
- **Primary industry**: Metal Ore Mining / Critical Minerals
- **Target customers**: B2B – energy, AI, and defense supply chains (including downstream manufacturers and government entities)
- **Mission or purpose**: "Create a future of critical mineral abundance" by reimagining the global minerals supply chain with software, automation, and data-driven decision making.

## Products & Services
- **Copper One (formerly Lisbon Valley Copper Mine)**: World’s first autonomous mine, located in Utah. Produces copper using integrated automation and software control. Restarted production in April 2026.
- **Lithium One**: Lithium project (on the roadmap or early development).
- **Other mineral projects**: Graphite, Uranium, Rare Earth Metals, Cobalt, Nickel, Aluminium – at various stages (stealth or roadmap).
- **CapitalProjectOS**: Internal software platform for capital project management (mentioned in leadership bio).
- **Technology Stack**: React, dbt, TypeScript, Python, TensorFlow, PyTorch, microservices, SCADA, Autodesk, and many others – indicating a strong software engineering backbone.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (private company)
- **Key Metric**: Total funding – $85M Series A (July 2025, 1 investor)
- **Notable Investors/Partners**: Lead investor not publicly disclosed (Andreessen Horowitz was pitched but not confirmed as an investor). Partners include Bot Auto, WeRide, Pronto, Atoms (based on LinkedIn mentions). Also works with UMA (Utah Mining Association).
- **Growth Signals**: Headcount grew 3,575% YoY to 107 employees (as of mid-2026). 73 active job postings. Opened the world’s first autonomous mine (Copper One) in April/May 2026, generating significant industry news and social media engagement.

## Competitive Advantages
- **Software-first approach**: The company builds automation and data systems from the ground up, rather than layering tech onto legacy mining operations. This enables fully autonomous mining.
- **Vertical integration**: They develop, own, and operate mineral projects, controlling the entire value chain from extraction to processing.
- **Deep tech stack**: Use of AI/ML (TensorFlow, PyTorch), simulation, and real-time control systems to optimize mining operations.
- **First-mover in autonomous mining**: Copper One is claimed to be the world’s first autonomous mine, giving them a significant lead in operational efficiency and safety.

## Strategic Focus
- Scale autonomous mining operations beyond copper (lithium, graphite, uranium, etc.)
- Secure domestic supply of critical minerals for U.S. energy, AI, and defense needs.
- Continue aggressive hiring across engineering, operations, and field roles.
- Expand from Utah to additional sites (Houston engineering office, potential new projects).

## Why Work Here
- **Culture principles**: "Extreme Ownership", "Engineer Out Requirements, Then Automate", "Share Your Legos" – emphasizing accountability, simplification, and collaboration.
- **Work environment**: High-growth startup with a mission-driven focus on critical infrastructure. Offices in San Francisco (HQ), Houston (Engineering), and La Sal, Utah (mine site). Hybrid/remote policy not explicitly stated, but multiple office locations suggest flexibility for field vs. office roles.
- **Notable perks**: Opportunity to work on cutting-edge autonomous systems and AI in a traditional industry. Strong engineering culture with modern tech stack (React, Python, ML). Rapid career growth due to company expansion.
- **Talent sources**: Attracts talent from Tesla, Redwood Materials, Lilac, ExxonMobil, Amazon Web Services, and other tech/energy companies – indicating a high-caliber peer group.

## Sources
1. [marianaminerals.com](https://marianaminerals.com/)
2. [marianaminerals.com/careers](https://marianaminerals.com/careers)
3. [marianaminerals.com/about](https://marianaminerals.com/about)
4. [jobs.ashbyhq.com/marianaminerals](https://jobs.ashbyhq.com/marianaminerals)
5. [linkedin.com/company/mariana-minerals](https://www.linkedin.com/company/mariana-minerals)

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