R&D Engineer - Magnets

R&D Engineer - Magnets

Commonwealth Fusion Systems, Devens, MA, USA

Salary: USD 70k-120k per year + equity

Posted on July 7, 2026

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. We’re working with policymakers and suppliers to build the energy industry of the future. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private fusion company in the world.

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 the 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.

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

• Develop new HTS magnet designs and their associated subsystems, including 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 and in designing and building R&D HTS magnets and their 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
• Collaborate with instrumentation and control engineers to develop necessary instrumentation and data acquisition systems
• Maintain documentation, schedules, and budgets for test campaigns, including design reviews, wiring lists, P&IDs, schematics, CAD assemblies, drawings, BOMs, data acquisition systems, and operations software
• Develop custom tools to analyze generated data and compile 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

• Bachelor’s degree in engineering or science; mechanical engineering, electrical engineering, applied physics, or similar preferred
• 2+ years’ experience as an R&D or test engineer designing, building, and commissioning complex electromechanical systems
• Experience 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 developing and executing test procedures
• Proficiency with CAD design in Siemens NX or equivalent software
• Familiarity with electromagnetic fundamentals – voltage, current, resistance, Ohm’s law, AC/DC, right‑hand rule, solenoids, etc.
• Excellent troubleshooting and problem‑solving skills with great attention to detail
• Experience developing and presenting comprehensive trade studies comparing technical approaches
• Data reduction and analysis skills for processing generated data
• Effective communication of technical topics to technical and non‑technical audiences
• High self‑motivation and drive to execute quickly
• Collaboration skills including active listening and facilitating productive discussions
• Willingness to challenge the status quo in search of better, more efficient methods

• Experience with modeling/analysis software such as ANSYS, COMSOL, or PLECS
• Experience writing Python or MATLAB data…