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Salary
$134k – $205k per year
Location
In office (Devens)
Seniority
Senior · 8+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 30, 2026. First seen by Alion on Oct 29, 2026. Commonwealth Fusion Systems scores A on the Alion truth index.

Overview
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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 Power Electronics Engineer

Join the Pulsed Electrical Distribution System (PEDS) team at CFS as we begin development on the next-generation power supplies that will power ARC, the first grid-scale commercial fusion power plant. In 2027 our power supplies will supply SPARC with over 1GW of pulsed power. Develop a fusion engineering skillset and learn from SPARC as we demonstrate Q>1. Apply your power electronic experience to develop and qualify next-generation power supplies for ARC and beyond. We need a skilled power electronic engineer to lead our team.

What you'll do:

  • Architect and design the next generation of high power (>10MVA) medium voltage power supplies for ARC tokamaks utilizing latest Si and SiC semiconductor devices
  • Collaborate with power semiconductor device manufacturers to develop and qualify new devices for fusion focused applications
  • Model and simulate power electronic circuits and components to evaluate and characterize converter performance, efficiency, stability, etc.
  • Build, test, and validate prototype 4Q power modules (H-bridge, DC link, passives, thermal management, etc.) for use within ARC tokamak power supplies
  • Turn qualified prototype designs into productized solutions for ARC power supplies
  • Develop technical requirements, specifications and qualification plans for corresponding power circuit components (capacitors, magnetics, passives, etc.)
  • Support cross-functional team technical developments such as power distribution, energy storage, RF and other systems delivering electrical power for fusion applications
  • Document designs, simulations and test results into engineering reports

What we’re looking for:

  • 8+ years of related experience with Bachelor’s degree (or) a Master’s degree with 6+ years of experience with power electronics based systems
  • Hands on product development experience for power electronic converter systems
  • Knowledge of various inverter circuit topologies and the benefits and limitations
  • Experience with modeling & simulation with analysis tools such as PLECS, PSPICE, MATLAB etc.
  • Extensive experience with semiconductor devices (IGBT, MOSFET, etc.) and magnetic components (transformers, inductors etc.)
  • Fundamental understanding of gate drive circuits, design and device protection
  • Experience with packaging design of power conversion equipment and thermal management
  • Experience with high power electrical equipment >10MVA
  • Experience with hands on testing of electrical components, sub-assemblies and systems in the laboratory and use of oscilloscopes and other measurement equipment
  • Excellent written and verbal communication skills, ability to conduct design reviews, organize and present results to both expert and non-technical audiences

Bonus points for:

  • Master’s degree in electrical engineering with a focus on Power Electronics
  • Experience with application of compliance standards to the designs (IEC, UL, CSA, NEC etc.)
  • Experience in problem solving, root cause analysis and field containment actions
  • Experience with hands on prototype build, prototype testing and documentation of results is a plus
  • Intelligent gate drive circuit design is a bonus

Must-have Requirements:

  • Ability to lift up to 50lbs
  • Perform activities such as standing, typing or sitting for extended periods of time
  • Willingness to travel or work required nights/weekends/on-call occasionally
  • 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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