R&D Production Test Engineer

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.

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.

• 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

• 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

• 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

• 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,…