R&D Engineer II

Commonwealth Fusion Systems

1050

Devens, MA

Posted on: 2026-06-12

Category: renewables

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Employment type:

Full time

Experience required:

Intermediate

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 we're 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 R&D Engineer II

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 R&D engineer will seamlessly flex between disciplines and groups to effectively execute tests and projects on aggressive schedules supporting CFS's mission. The 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.

#LI-Hybrid

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:

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

3+ years’ experience as an R&D engineer or test engineer designing, building, commissioning complex electromechanical systems

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

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