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Commonwealth Fusion Systems

Senior R&D Engineer

Devens, MA, United States

$134,000 to $205,000 USD / year

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Job details

Pay: $134,000 to $205,000 USD / year
Experience: 7+ years’ experience as an R&D engineer or test engineer designing, building, commissioning complex electromechanical systems
Posting language: English
Posted: Nov 4, 2026

Original job description

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 a Senior R&D Engineer

The NINT Magnet R&D team is responsible for testing and retiring risks for CFS's NINT (non-insulated-non-twisted) HTS magnets. This includes executing development test campaigns for CFS's next-generation NINT magnet technology, and leading RCCA efforts through analysis and testing to resolve issues that may arise with the SPARC NINT magnets currently in production, tokamak integration, and commissioning. HTS magnet technology is inherently multidisciplinary, and a successful Senior R&D engineer will seamlessly flex between disciplines and groups to effectively lead the execution of tests and projects on aggressive schedules supporting CFS's mission. The Senior R&D engineer must have a fundamental understanding of mechanical, electrical, materials, fluids, and systems engineering, or some combination thereof. It is also the role of the R&D engineer to constantly push and challenge the requirements, risks, and test objectives that they are given to help the combined stakeholders come to a consensus on why the planned test is required and what data is deemed essential for the outcome to be achieved.

What you'll do:

Develop new HTS magnet designs and their associated subsystems, which includes the designing and building R&D test samples, and developing their manufacturing processes and test operations
Design, build, and commission test equipment required to accomplish R&D test campaign objectives
Perform structural, electrical, and/or thermal analyses in support of R&D sample design and to predict test results
Build expertise in testing HTS magnets as well as how to design and build R&D HTS magnets and their associated subsystems, including power delivery, cryogenic cooling, and structures
Support the production, integration, and commissioning of SPARC NINT coils as issues requiring HTS magnet build and test expertise arise
Understand, challenge, and maintain well documented requirements and risks for the system or component under test, and align stakeholders on why the planned test is required and what data is deemed essential for the desired outcome to be achieved
Collaborate with I&C engineers to develop necessary instrumentation and data acquisition systems
Maintain documentation, schedules, and budgets for test campaigns. Documentation includes: design reviews, wiring lists, P&IDs, schematics, CAD assemblies, drawings, BOMs, data acquisition systems, and operations software
Develop custom tools to analyze generated data. Compile test results in presentations for review
Prepare and deliver presentations containing trade studies, design reviews, test readiness reviews, and test data reviews to teams of engineers and physicists

What we’re looking for:

Bachelor’s degree in engineering or science field is required; mechanical engineering, electrical engineering or similar, or applied physics degree preferred
7+ years’ experience as an R&D engineer or test engineer designing, building, commissioning complex electromechanical systems
Experience working on a multi-disciplinary engineering project, ideally as a technical leader
Excellent fundamental knowledge of mechanical systems such as static structures and heat transfer
Experience with selecting and utilizing instrumentation and control components such as thermocouples, voltage and current sensors, oscilloscopes, pressure transducers, strain gauges, heaters, flow meters, fittings and valves
Experience with developing and executing test procedures
Proficiency with CAD design in Siemens NX or equivalent CAD software
Familiarity with electromagnetic fundamentals - voltage, current, resistance, Ohm’s law, AC/DC, right-hand rule, solenoids, etc
Excellent troubleshooting / problem-solving skills with great attention to detail
Experience developing and effectively presenting comprehensive trade studies comparing the pros & cons of various technical approaches
Data reduction and analysis skills that can be used in generating anticipated results and processing generated data
Effective at communicating technical topics to both technical and non-technical audiences
High self-motivation and drive to execute quickly
Collaboration skills including active listening and facilitating production discourse on problems
Willingness to challenge the status quo in search of better, more efficient methods

Bonus points for:

Experience with modeling/analysis software, especially ANSYS, COMSOL, and PLECS
Experience writing Python or MATLAB data tools for processing and analyzing data
Experience with high voltage and high current power equipment design and use – power supplies, water-cooled cables, insulation
Experience debugging electronics hardware and test software
Experience with designing and commissioning new test facilities
Experience designing fluid systems – P&IDs, component selection, ASME design codes
Experience with cryogenic equipment design for use with liquid nitrogen and supercritical helium – vacuum jacketed equipment, cryocoolers, phase separators, cold traps
Experience with high vacuum equipment design and use – roughing pumps, turbopumps, ion gauges, residual gas analyzers
Experience developing or improving manufacturing processes and handing off processes to production teams

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

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.

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