Commissioning Engineer

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’re building a core commissioning team of talented, versatile engineers who know how to take a plant from mechanical completion to running. As a Commissioning Engineer, you’ll own electrical and mechanical commissioning scopes: energizing power systems, bringing up equipment and utilities, and getting new systems online safely.

You’ll work alongside local commissioning teams, own your commissioning assignments, and make sure we’re building and using our systems throughout commissioning.

Your first year will likely be focused on Copper One, our operating copper mine and refinery in Utah, or Lithium One, our new lithium facility in Texas. After that, you’ll go wherever we’re bringing new capacity online, anywhere in the world. Between commissioning pushes, you’ll support design teams and projects at other sites. There’s always something being built.

This is a hands-on role for scrappy, collaborative engineers who thrive during startup. You’ll solve problems in the field, do some of your own design work when needed, bring new systems online for the first time, and do it safely, every time.

• Lead commissioning teams at various locations. The candidate must be willing to travel to sites during commissioning.

• Develop detailed commissioning plans in advance of commissioning activities.

• Ensure documentation is complete, including LOTO procedures, work instructions, maintenance procedures, detailed plans, schedules, budgets, etc.

• Own scopes relative to engineering expertise.

• Lead safe startup practices so everyone gets home safe.

• Confirm proper installation and functionality of equipment. Lead specific activities on site during dry and wet commissioning.

• Lead ramping activities for assigned commissioning area(s).

• Ensure equipment is functional, including controls functionality.

• Train and hand over equipment to onsite operators and maintenance personnel.

• Serve as a technical expert to assist in process engineering after handover to operations as needed.

• Simplify commissioning procedures, then assist in building tools in MarianaOS to automate and scale.

• Document and share lessons learned so every site starts from a stronger playbook.

• Support design teams and projects at other sites between commissioning cycles.

• Contribute to design reviews and Haz Ops during the design phase.

• Travel up to 80%, including extended site assignments during onsite commissioning. Short-notice trips are possible. Between projects, work from a Mariana office or, preferably, an operating asset when needed.

• Bachelor’s degree or higher in chemical, mechanical, electrical, or a related engineering field preferred, or proven hands‑on experience commissioning industrial systems.

• Hands‑on commissioning experience on greenfield or new‑plant startups, with deep expertise in electrical or mechanical systems and working knowledge of the other.

• Background in battery/EV, semiconductor, data centers, advanced manufacturing, or similar fast‑paced industrial environments strongly preferred.

• Working knowledge of equipment common in mining and/or refining and plant utilities.

• Ability to read and mark up single‑lines, P&IDs, schematics, and mechanical drawings.

• Desire to help build a smart P&m.

• Preferred: PLC/controls and instrumentation startup experience, experience at a company that designs, installs, and commissions its own equipment, and comfort using AI tools to speed up your work.

• Coll…