{"id":122289,"url":"https://alion.io/job/commonwealth-fusion-systems-staff-multiphysics-modeler","title":"Staff Multiphysics Modeler","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":"2026-10-30T05:48:23Z"}},"role":"Energy","role_family":"Energy","seniority":"staff","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":152000,"max":230000,"currency":"USD","period":"year","gross":null,"usd_annual":230000},"salary_estimate":null,"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Confluence","optional":true},{"name":"MATLAB","optional":true},{"name":"Python","optional":true}],"status":"live","first_seen_at":"2026-07-16T20:41:53Z","employer_posted_date":"2026-07-16","last_verified_at":"2026-10-30T08:20:58Z","board_verified":true,"closed_at":null,"days_open":105,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":105},"description":"Join the power movement as a Staff Multiphysics Modeler\nThe Staff Multiphysics Modeler will work closely with the CFS tritium program and process engineering team to develop a fuel cycle model for the world's first fusion power plant, ARC, located in Chesterfield County, Virginia.\nThe Staff Multiphysics Modeler will develop simulation toolkits and workflows that integrate first-principles multiphysics simulations with industrial process models to support technology development and subsystem integration for key fuel cycle systems, supported by the CFS fuel team to understand system requirements.\nThe ideal candidate is an expert in heat and mass transport modeling, with an appreciation for simplicity and drive to build. This individual knows the power of optimizing devices by tuning material parameters, and appreciates a simple non-dimensional analysis and rigorous integrated simulations as the problem space requires. The candidate enjoys teaching and building tools that others can use independently.\nApplicants must have a degree in a relevant engineering or science discipline as well as experience in process modeling and programming. Applicants must have a demonstrated ability to apply a first principles approach in solving complex engineering problems and experience conducting cost-benefit to evaluate the economics of proposed solutions. Applicants must have demonstrated success working on engineering projects in multi-disciplinary teams generating effective solutions to complex problems.\nWhat you'll do:\nLead the development of an integrated power plant fuel cycle model\nDevelop models for unit operations and incorporate multi-effects in components\nDevelop simulation tools to enable targeted R&D for key fuel cycle technologies\nOwn the fuel cycle simulation tools and models\nValidate models and identify key R&D requirements to enable validation where there are currently gaps in the literature\nCollaborate cross-functionally with both internal and external experts to ensure fuel cycle models are feasible, economic and state-of-the-art\nDevelop processes and layouts for fueling subsystem blocks that are communicated through standard engineering documents\nGenerate detailed work plans and define milestones, integrated with R&D, to deliver validated models\nProvide guidance to colleagues for use of developed modeling tools and outputs\nIdentify emerging trends and opportunities and influence CFSs’s fuel cycle modeling strategy\nWhat we're looking for:\nMaster’s degree or similar experience with 10+ years in chemical engineering, mechanical engineering, physics, materials science, physical chemistry or similar\n10+ years experience modeling process systems\n10+ years experience in computer programming\nExpertise with transport phenomena and chemical processes in gasses including demonstrated experience building integrated process models\nProven experience as an “expert” to evangelizing solutions and working across teams for shared solutions\nExperience building and managing large data sets\nUnderstanding of scalable simulations\nTrack record in version control\nData reduction and results analysis\nBonus points for:\nExperience with Python and/or Matlab\nExperience with multiphysics tools such as Comsol\nExposure to process simulators like HYSYS\nUse of engineering management tools\nConfluence/JIRA and remote collaboration tools\nFusion energy experience\nChemical engineering\nAtom and molecular mass transport\nMust-have requirements:\nAbility to occasionally lift up to 50 lbs\nPerform activities such as sitting, typing, standing, stooping, or climbing for extended periods of time\nDedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics\nWillingness to travel or work required nights/weekends/on-call occasionally","description_format":"text","description_chars":3838,"description_truncated":false,"requirements":{"experience_years_min":10,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"master","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Nuclear Energy","Nuclear 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