{"id":3425087,"url":"https://alion.io/job/commonwealth-fusion-systems-senior-mechanical-engineer-vacuum","title":"Senior Mechanical Engineer - Vacuum","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":"2026-10-31T05:58:55Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","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":["Milpitas, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":146000,"max":210000,"currency":"USD","period":"year","gross":null,"usd_annual":210000},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ANSYS","optional":false},{"name":"SolidWorks","optional":false}],"status":"live","first_seen_at":"2026-10-28T19:38:32Z","employer_posted_date":"2026-10-28","last_verified_at":"2026-10-31T09:24:40Z","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 Mechanical Engineer\nWe’re looking for a Senior Mechanical Engineer to join our R&D and equipment design team to help build the next generation equipment. You will be responsible for the end-to-end design, integration, and implementation of advanced thermal vacuum equipment and R&D machinery.\nThis role requires you to be a technical expert who can drive innovative architecture while maintaining the procedural discipline necessary for high-performance hardware. If you enjoy solving complex thermal-mechanical problems in vacuum environments and mentoring others in a collaborative, fast-paced setting, this is your opportunity to make an impact.\nWhat you'll do:\nLead System Design: Own the design, integration, and validation of R&D equipment\nDefine Requirements: Establish system-level requirements and innovative design concepts that directly correlate mechanical precision to product quality\nStandardize Best Practices: Implement and maintain engineering workflows, and best practices using semiconductor standards as your guide\n Lead Design Reviews: Conduct rigorous reviews for overall mechanical systems and sub-systems, emphasizing manufacturability (DFx) and best practices for mechanical design\nCollaborate & Interface: Generate and maintain critical interfaces with cross-functional teams, including scientists, vacuum specialists, and electrical engineers\nProject Accountability: Report on project milestones to stakeholders, ensuring delivery of on-time and in-spec outcomes\nGet Things Done: Act with speed to drive projects from concept through assembly, testing, and implementation\nWhat we’re looking for:\n Education: Master’s degree in Mechanical Engineering or a related field (or equivalent industrial experience)\nExperience: 7+ years of experience in the design and implementation of complex R&D systems or semiconductor manufacturing equipment\n Thermal & Structural Expertise: Practical experience managing vacuum architecture (pumps, gauges, leak detection) and thermal management systems (chillers, heat exchangers)\nVacuum System Proficiency: Deep understanding of vacuum architecture, including material outgassing, seal integrity, and pump-down optimization\n Software Mastery: Expertise in 3D modeling (SolidWorks and/or NX) and FEA/Thermal simulation tools (COMSOL, ANSYS)\nHands-on Capability: Ability to bridge the gap between design and the shop floor, including experience with manual/CNC machining, prototyping, and hardware troubleshooting\nVendor Management: Experience selecting and qualifying global vendors for specialized components or custom sub-systems\nLeadership: Demonstrated ability to lead effectively in both direct and matrixed organizational structures\nBonus points for:\nSemiconductor Background: Prior success building first-of-kind or experimental tools for semiconductor R&D or thin-film deposition\nStandards Knowledge: Familiarity with SEMI, ASME, ASTM, and other industry-standard mechanical codes\n Motion Control: Experience designing precision motion and motor-controlled systems within challenging environments\nMust-have requirements:\nAbility to lift up to 25 lbs occasionally\nPerform activities such as stooping, climbing, standing, sitting for extended periods of time\nWillingness to travel or work required nights/weekends/on-call occasionally\nDedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, 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