{"id":3491984,"url":"https://alion.io/job/commonwealth-fusion-systems-senior-power-electronics-engineer-2","title":"Senior Power Electronics Engineer","company":{"id":8705,"name":"Commonwealth Fusion Systems","domain":"cfs.energy","url":"https://alion.io/company/commonwealth-fusion-systems","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":85,"open_postings":5,"ghost_share":0,"stale_share":0.6,"repost_share":0,"time_to_fill_p50_days":54,"computed_at":"2026-11-01T06:10:25Z"}},"role":"Hardware","role_family":"Hardware","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Devens, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":134000,"max":205000,"currency":"USD","period":"year","gross":null,"usd_annual":205000},"salary_estimate":null,"experience_years_min":8,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"MATLAB","optional":false}],"status":"live","first_seen_at":"2026-10-29T20:13:37Z","employer_posted_date":"2026-10-29","last_verified_at":"2026-11-01T07:12:10Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Join the power movement as a Senior Power Electronics Engineer\nJoin 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.\nWhat you'll do:\nArchitect and design the next generation of high power (>10MVA) medium voltage power supplies for ARC tokamaks utilizing latest Si and SiC semiconductor devices\nCollaborate with power semiconductor device manufacturers to develop and qualify new devices for fusion focused applications\nModel and simulate power electronic circuits and components to evaluate and characterize converter performance, efficiency, stability, etc.\nBuild, test, and validate prototype 4Q power modules (H-bridge, DC link, passives, thermal management, etc.) for use within ARC tokamak power supplies\nTurn qualified prototype designs into productized solutions for ARC power supplies\nDevelop technical requirements, specifications and qualification plans for corresponding power circuit components (capacitors, magnetics, passives, etc.)\nSupport cross-functional team technical developments such as power distribution, energy storage, RF and other systems delivering electrical power for fusion applications\nDocument designs, simulations and test results into engineering reports\nWhat we’re looking for:\n8+ years of related experience with Bachelor’s degree (or) a Master’s degree with 6+ years of experience with power electronics based systems\nHands on product development experience for power electronic converter systems\nKnowledge of various inverter circuit topologies and the benefits and limitations\nExperience with modeling & simulation with analysis tools such as PLECS, PSPICE, MATLAB etc.\nExtensive experience with semiconductor devices (IGBT, MOSFET, etc.) and magnetic components (transformers, inductors etc.)\nFundamental understanding of gate drive circuits, design and device protection\nExperience with packaging design of power conversion equipment and thermal management\nExperience with high power electrical equipment >10MVA\nExperience with hands on testing of electrical components, sub-assemblies and systems in the laboratory and use of oscilloscopes and other measurement equipment\nExcellent written and verbal communication skills, ability to conduct design reviews, organize and present results to both expert and non-technical audiences\nBonus points for:\nMaster’s degree in electrical engineering with a focus on Power Electronics\nExperience with application of compliance standards to the designs (IEC, UL, CSA, NEC etc.)\nExperience in problem solving, root cause analysis and field containment actions\nExperience with hands on prototype build, prototype testing and documentation of results is a plus\nIntelligent gate drive circuit design is a bonus\nMust-have Requirements:\nAbility to lift up to 50lbs\nPerform activities such as standing, typing or sitting for extended periods of time\nWillingness to travel or work required nights/weekends/on-call occasionally\nWork in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high 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