Senior Mechanical Commissioning Test Engineer

Commonwealth Fusion Systems

1050

Devens, MA, United States

Posted on: 2025-10-21

Category: renewables

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Employment type:

Full time

Experience required:

Senior

Salary

Salary not provided

About the company:

Commonwealth Fusion Systems (CFS) is on a mission to deliver clean fusion energy to the planet fast enough to matter for humanity’s biggest challenges.

It’s urgent. The gap between the energy we need and the energy we have is widening every day. Fusion is a critical part of the energy transition away from fossil fuels, a new chapter for the world’s energy supply.

We’re committing to delivering fusion power plants and a full-fledged fusion energy industry as we’ve delivered on other promises. Like the world’s strongest high-temperature superconducting magnet, the game-changing technology that’s making commercial fusion energy a reality.

We’ve raised over $2 billion in capital — more than any other fusion energy company — and attracted top talent to design, build, and deliver commercial fusion power plants. And we’re working with policymakers and suppliers to make fusion energy available globally.

As we push toward the fusion-energy future, we’ll keep setting and meeting milestones, sharing and validating our progress, and encouraging others to do the same.

About Commonwealth Fusion Systems:

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Senior Mechanical Commissioning Test Engineer

The Senior Mechanical Commissioning Test Engineer is responsible for the initiation, development, revision and execution support of the Mechanical Test procedure development process associated with the SPARC Assembly project initiative.

#LI-Onsite

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

What you'll do:

Execute long term complex testing procedures performed in the field encompassing multiple disciplines and several stages based on project maturity and progress - mechanical test focus involving (but not limited to) code driven or guided leak and pressure testing initiatives including mass spectrometry leak detection methods

Collaborate with CFS Engineering groups to develop SPARC Assembly (SASY) in-situ test procedures

Serve as an test implementation expert for testing of assigned disciplines or tasks, provide guidance and instruction to cross functional groups within CFS

Identify potential issues pro-actively during the test planning and procedure development phase to ensure proper risk management and quality assurance of test results in a fast-paced environment

Provide in-field support during high risk test evolutions or simple / complex troubleshooting (leak testing, pressure testing, etc.)

Collaborate with internal teams / external vendors for test feature custom design & fabrication

Ensure that activities being performed in the field are being conducted in accordance with CFS Standards and regulatory standards (NEC, NFPA, ASME, ASTM, OSHA, etc.) or best industry practices

Adhere to the highest standards of safety and ensure that activities taking place under her or his oversight are being performed in strict accordance with CFS safety policies and applicable regulatory safety standards

Collaborate with CFS EHSS and CFS engineering teams to proactively identify risks and align mitigation requirements for all activities. Participate in Risk Assessment activities and Root Cause Analysis as necessary

What we're looking for:

BS in Engineering or related field

10+ Years Commissioning (similar and cross functional experience in operations or maintenance is acceptable)

High proficiency Google documents, BlueBeam or Acrobat, and 3D modeling programs

Bonus points for:

Mechanical testing or commissioning experience

OSHA 10

NFPA 70E

Must-have requirements:

Ability to occasionally lift up to 50 lbs

Perform activities such as stooping, climbing, typing, standing, or sitting for extended periods of time

Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

Willingness to occasionally travel to witness FAT at vendor locations worldwide. May work second/third shifts and/or weekends as dictated by project needs

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