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 we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading 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 an R&D Production Test Engineer

We’re seeking an experienced Test Engineer to support the testing and de-risking of our cutting-edge HTS magnet technology, playing a key role in advancing fusion energy. Embedded within our R&D organization, you’ll take on a broad range of responsibilities, from developing methodologies and procedures with magnet physicists to conducting root cause analysis alongside manufacturing experts working with complex new materials. This dynamic role demands flexibility, cross-disciplinary collaboration, and the ability to execute tests on tight timelines. You’ll lead the integration and operation of complex test stands, define safety standards, develop and refine procedures, and drive continuous improvement to help achieve our extraordinary milestones in making fusion a reality.

What you'll do:

Lead magnet and other test campaigns in cryogenic, vacuum, and high-current environments
Develop detailed test procedures and ensure data integrity with robust instrumentation and controls
Support improvements to test stands, optimizing for test rate and ensuring data quality
Design, analyze, and build test equipment, including mechanical, electrical, and fluid systems
Maintain and document test requirements, risks, and safety protocols
Manage test schedules, budgets, and technical documentation (P&IDs, CAD designs, schematics, etc.)
Improve test processes for repeatability and efficiency
Analyze test data, create custom tools for data analysis, and present findings to cross-functional teams
Lead anomaly investigations and resolution, collaborating with physicists and engineers

What we’re looking for:

Bachelor’s (or higher) in engineering or applied physics, with 2+ years of hands-on testing experience
Expertise in test stand operation, data collection, and cross-functional collaboration
Strong background in test planning, data analysis, and test equipment design
Experience with electromagnetic fundamentals and troubleshooting complex systems
A passion for process improvement and innovative problem-solving
Excellent communication skills, with the ability to present technical topics clearly
Self-motivated, results-driven, and eager to learn

Bonus points for:

Experience with structural FEA software, particularly ANSYS and COMSOL

Proficiency in using NX and Teamcenter for designing complex test equipment and assemblies

Experience with Ignition for developing Human Machine Interfaces

Proficiency in using Jira or similar ticket and task tracking software for managing projects and status

Experience with large-scale data collection, manipulation, and analysis to derive actionable insights

Hands-on experience operating complex test stands for long-duration test campaigns

Must-have requirements:

Ability to occasionally lift up to 50 lbs

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

Willingness to occasionally travel or work required nights/weekends/on-call

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

#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.

R&D Production Test Engineer

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