The Role
Leads architecture, design, simulation, prototyping, testing, qualification, and productization of high-power medium-voltage power supplies for fusion tokamaks. Responsibilities include developing power modules, collaborating with semiconductor manufacturers, specifying components, managing thermal systems, validating electrical equipment above 10MVA, supporting cross-functional power systems, and documenting engineering results. The role also requires design reviews, technical communication, occasional travel or on-call work, and working safely around industrial and high-voltage hazards.
Summary Generated by Built In
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 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
#LI-Onsite
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.
Skills Required
- Bachelor’s degree with 8+ years of related power electronics systems experience, or a master’s degree with 6+ years of experience
- Hands-on product development experience with power electronic converter systems
- Knowledge of inverter circuit topologies and their benefits and limitations
- Experience modeling and simulating power electronic circuits using tools such as PLECS, PSPICE, or MATLAB
- Extensive experience with semiconductor devices such as IGBTs and MOSFETs and magnetic components such as transformers and inductors
- Understanding of gate-drive circuits, device protection, packaging design, and thermal management
- Experience with high-power electrical equipment above 10MVA
- Hands-on laboratory testing of electrical components, subassemblies, and systems using oscilloscopes and other measurement equipment
- Excellent written and verbal communication skills, including conducting design reviews and presenting technical results
- Ability to lift up to 50 pounds
- Ability to stand, type, or sit for extended periods
- Willingness to travel or work occasional nights, weekends, or on-call shifts
- Ability to work in a facility with industrial hazards, including high voltage, high current, strong magnets, fumes, lead, pressure systems, and cryogenics
- Master’s degree in electrical engineering with a power electronics focus
- Experience applying IEC, UL, CSA, NEC, or other compliance standards
- Experience with problem solving, root cause analysis, and field containment actions
- Hands-on prototype building, testing, and documentation experience
- Intelligent gate-drive circuit design experience
Commonwealth Fusion Systems Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Commonwealth Fusion Systems and has not been reviewed or approved by Commonwealth Fusion Systems.
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Healthcare Strength — Health insurance is a core part of the package, with broad medical coverage presented as competitive for a growing tech and engineering employer. This is consistently listed alongside other cornerstone benefits.
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Retirement Support — A 401(k) program with employer match is prominently included in compensation descriptions, signaling support for long-term savings. This appears across roles, including technical and production postings.
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Parental & Family Support — Generous parental leave is cited as a notable element of the offering. It sits alongside paid leave options that many candidates prioritize.
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The Company
What We Do
Commonwealth Fusion Systems (CFS) has the fastest, lowest cost path to commercial fusion energy. CFS is collaborating with MIT to leverage decades of research combined with new groundbreaking high-temperature superconducting (HTS) magnet technology. HTS magnets will enable compact fusion power plants that can be constructed faster and at lower cost. CFS is now building SPARC, the world's first commercially relevant, net energy fusion demonstration device. SPARC will pave the way for the first fusion power plant, ARC, that will produce power on the grid. The ultimate mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. CFS has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by the world’s leading investors, CFS is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. If you are interested in joining our team, check out cfs.energy/careers for more information.
