{"id":4209585,"url":"https://alion.io/job/commonwealth-fusion-systems-power-electronics-engineer","title":"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":"B","score":83,"open_postings":6,"ghost_share":0,"stale_share":0.667,"repost_share":0,"time_to_fill_p50_days":52,"computed_at":"2026-11-12T10:38:37Z"}},"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":107000,"max":160000,"currency":"USD","period":"year","gross":null,"usd_annual":160000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"MATLAB","optional":false}],"status":"live","first_seen_at":"2026-11-12T18:46:12Z","employer_posted_date":"2026-11-12","last_verified_at":"2026-11-13T00:32:33Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"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 inverters and power supplies for ARC and beyond. We need a results driven power electronic engineer to lead our inverter development.\nWhat you'll do:\nLead the testing, qualification and commissioning of SPARC power supplies operating up to 2kV and 50kA\nCollaborate with power semiconductor device manufacturers to develop and qualify new Si and SiC devices for the next generation of high power (>10MVA) medium voltage power supplies for ARC tokamaks\nDesign and develop high-power 4Q H-bridge inverter topologies using SiC MOSFETs, IGBTs, or other high-power semiconductor devices for use within ARC tokamak power supplies\nLead the build, test, and validation of prototype 4Q power modules including the evaluation performance/losses and validate inverter protection mechanisms, fault detection, fault response time, and safe shutdown behavior\nModel and simulate power electronic circuits and components to evaluate and characterize converter performance, efficiency, stability, etc\nCoordinate with mechanical, PCB, firmware, and manufacturing engineering teams to develop control circuits and packaged sub modules\nDevelop technical requirements, specifications and qualification plans for corresponding power circuit components (capacitors, magnetics, passives, etc.) and vendor selection\nSupport cross-functional team technical developments such as power distribution, energy storage, RF and other systems delivering electrical power for fusion applications\nWhat we’re looking for:\n5+ years of related experience with Bachelor’s degree (or) a Master’s degree with 3+ years of experience with power electronics based systems\nHands on product development experience for power electronic converter systems\nExtensive knowledge of semiconductor devices (IGBT, MOSFET, etc.)\nExperience with high power semiconductor devices (>1kA)\nExperience with modeling & simulation with analysis tools such as PLECS, PSPICE, MATLAB etc.\nExperience with packaging design of power conversion equipment and thermal management\nHands on testing experience in a 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\nResults driven and ability to embrace and convince stakeholders on a change in design direction in pursuit of a high-quality product release\nBonus points for:\nMaster’s degree in electrical engineering with a focus on Power Electronics\nExperience with DC power systems\nFamiliarity with cascaded or interleaved systems utilizing smaller submodules to create a higher power output\nEnergy storage experience\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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