{"id":854647,"url":"https://alion.io/job/f-cryogenic-systems-engineer","title":"Cryogenic Systems Engineer","company":{"id":691631,"name":"Fuse","domain":"f.energy","url":"https://alion.io/company/f-2","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":75,"open_postings":10,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-24T06:02:35Z"}},"role":"Energy","role_family":"Energy","seniority":"junior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Leandro, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":110000,"max":165000,"currency":"USD","period":"year","gross":null,"usd_annual":165000},"salary_estimate":null,"experience_years_min":2,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Mass Spectrometry","optional":false},{"name":"ANSYS","optional":true}],"status":"live","first_seen_at":"2026-08-19T05:34:14Z","employer_posted_date":"2026-08-19","last_verified_at":"2026-10-24T12:45:10Z","board_verified":true,"closed_at":null,"days_open":66,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":66},"description":"About Fuse\nWe are building one of the most potentially consequential companies of the century. Our mission is to accelerate the world's transition to fusion energy while safeguarding humankind. This is not a normal company. This is not a normal job. We are committed for the long term to win.\nAbout the Role\nFuse is constructing Z-Star, a next-generation pulsed-power facility. Z-Star requires two deeply integrated cryogenic systems: a high-vacuum cryopumping system and a 4 K target/liner cryogenic cooling system.\nAs the Cryogenic Systems Engineer, you'll design, commission, operate, and maintain both systems and serve as the facility's resident expert in cryogenic and vacuum science.\nCore Responsibilities\nCryopump System Design & Operations\nDesign, procure, install, and commission the multi-stage vacuum system for the Z-Star chamber, including turbomolecular roughing pumps, cryopump arrays, and associated gate valves, interlocks, and controls.\n\nDefine cryopump sizing, placement, and regeneration schedules to meet target base pressure and shot-repetition-rate requirements.\n\nDevelop and maintain vacuum protocols including chamber venting, backfilling with inert gas, and controlled pump-down procedures compatible with shot operations.\n\nMonitor and trend vacuum performance; diagnose and resolve outgassing sources, virtual leaks, and pump degradation.\n\n4 K Target Cryogenic System\nDesign and commission the liquid helium cryostat and cryogenic delivery system for liner/target cooling, including vacuum-jacketed transfer lines, LHe reservoir management, and temperature-control instrumentation.\n\nDevelop procedures for target loading, cool-down, hold time at 4 K, and rapid warm-up following a shot.\n\nCharacterize and minimize cryogenic heat loads from radiation, conduction, and parasitic pathways to maintain stable 4 K conditions through the target preparation window.\n\nCryogenic Infrastructure Management\nManage liquid helium and liquid nitrogen supply, storage dewars, and transfer operations on-site, including logistics, safety, and vendor relationships.\n\nMaintain all cryogenic hardware: cryopumps, compressors, cold heads (Gifford-McMahon or Pulse Tube), transfer lines, pressure-relief systems, and monitoring instrumentation.\n\nDevelop and implement a preventive-maintenance program for all cryogenic and vacuum equipment aligned with the facility shot schedule.\n\nTrain facility operations staff on cryogenic safety procedures and emergency response.\n\nDiagnostics & Instrumentation\nSpecify, install, and maintain cryogenic instrumentation: Cernox or PT-100 temperature sensors at multiple stages, capacitance manometers, ionization gauges, residual gas analyzers (RGA), and pressure transducers.\n\nIntegrate cryogenic-system monitoring into the facility control and interlock system.\n\nSafety & Compliance\nAuthor and enforce cryogenic safety procedures, including ODH assessments, pressure-vessel requirements, LHe handling, and cold-burn precautions, in compliance with applicable U.S. codes.\n\nPerform pressure-vessel and cryostat inspection and documentation per applicable ASME/CSA standards.\n\nMinimum Qualifications\nB.Sc. or M.Sc. in Physics, Mechanical Engineering, Engineering Physics, or Chemical Engineering with demonstrated cryogenics specialization.\n\n2+ years of hands-on experience designing, operating, or maintaining cryogenic systems at liquid-helium temperatures (4 K) in a research or industrial facility.\n\nProficiency with cryopump systems including sizing, installation, and regeneration cycles.\n\nStrong working knowledge of vacuum science and technology: pumping speed, conductance, outgassing, leak detection using He mass spectrometry, residual gas analysis, and pressure measurement.\n\nExperience designing or operating liquid-helium dewars, cryostats, and VJ transfer lines.\n\nFamiliarity with cryogenic instrumentation including thermometry, pressure, flow, and liquid-level measurement from 4 K to 300 K.\n\nPreferred Qualifications\nExperience with fusion energy, pulsed power, or particle-accelerator cryogenic systems, particularly high-voltage-isolated cryogenic assemblies.\n\nFamiliarity with MagLIF-type target cryostats or ICF cryogenic target-preparation systems.\n\nExperience with Gifford-McMahon (GM) or Pulse Tube (PT) cryocoolers for closed-cycle refrigeration.\n\nKnowledge of cryogenic safety standards including ASME Section VIII, CGA G-5.4, ODH analysis procedures, and pressure-relief system design.\n\nExperience with large vacuum-chamber systems (>10 m³) in a pulsed or repetitive-shot experimental facility.\n\nProficiency in thermal modeling and simulation using ANSYS, COMSOL, or equivalent tools.\n\nWhat We Value\nGive a shit. Build things you're proud of.\n\nTake responsibility. If something is broken and you can fix it, fix it. See things through.\n\nMove fast. Make decisions, learn quickly, and keep moving forward.\n\nThink bigger. Simplify relentlessly. Don't default to the safe answer.\n\nDisagree and commit. The best idea wins. Once a decision is made, we move.\n\nDesire to win. This is hard. Expect intensity. We are here to win.\n\nPlan B is to make Plan A work.\n\nBenefits\nMedical, dental, and vision coverage.\n\nRelocation assistance for roles that require it.\n\nFlexible time off. Take what you need, no accrual tracking.\n\n2 weeks of paid time off built into the end of each year, subject to team and business needs.\n\nSupportive leave of absence policies.\n\nPaid leave for new parents.\n\nITAR Requirements\nTo conform to U.S. Government technology export regulations, including the International Traffic in Arms Regulations (ITAR), you must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.\nEqual Opportunity\nFuse is an Equal Opportunity Employer; employment with Fuse is governed on the basis of merit, competence, and qualifications and will not be influenced by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, ancestry, immigration status, sexual orientation, gender identity, marital status, mental or physical disability, or any other legally protected status.","description_format":"text","description_chars":6222,"description_truncated":false,"requirements":{"experience_years_min":2,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Flexible time off","Relocation assistance"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":true,"industries":["Nuclear Energy"],"lifecycle":[{"event":"open","at":"2026-09-13T05:41:29Z"}],"visa":[],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.271,"p_room":0.28,"age_days":66,"expected_fill_days":28,"reasons":["conf:1","stale_co","velocity","win:tail","crowd:junior"],"computed_at":"2026-10-24T06:02:35Z"},"pay":{"stated_usd_annual":165000,"is_top_pay":true},"html_url":"https://alion.io/job/f-cryogenic-systems-engineer","json_url":"https://alion.io/job/f-cryogenic-systems-engineer.json","meta":{"generated_at":"2026-10-24T15:23:47Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":21995,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":691631},"rest":"https://alion.io/mcp/rest/get_company?id=691631"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ff-cryogenic-systems-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Ff-cryogenic-systems-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Ff-cryogenic-systems-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/f-cryogenic-systems-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ff-cryogenic-systems-engineer"}]}