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Salary
$134k – $205k per year
Location
In office (Devens)
Seniority
Senior · 7+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Nov 10, 2026. First seen by Alion on Nov 4, 2026. Commonwealth Fusion Systems scores B on the Alion truth index.

Overview
Company
Impact
Profile match
Commonwealth Fusion Systems is a commercial fusion energy company headquartered in Devens, Massachusetts, and founded in 2018. The firm specializes in the development of high-temperature superconducting magnets and compact tokamak devices, specifically the SPARC net-energy machine and the ARC commercial power plant. It operates through a strategic partnership with the Massachusetts Institute of Technology and focuses on scaling fusion technology to provide carbon-free, baseload power to global energy markets.

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
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