{"id":1499232,"url":"https://alion.io/job/xcimer-energy-cryophysicist","title":"Cryophysicist","company":{"id":685639,"name":"Xcimer Energy","domain":"xcimer.energy","url":"https://alion.io/company/xcimer","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":95,"open_postings":22,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":133,"computed_at":"2026-10-04T05:45:00Z"}},"role":"Science & Research","role_family":"Science & Research","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Denver, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140000,"max":165000,"currency":"USD","period":"year","gross":null,"usd_annual":165000},"salary_estimate":null,"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-09-29T21:01:35Z","employer_posted_date":"2026-09-29","last_verified_at":"2026-10-05T02:13:26Z","board_verified":true,"closed_at":null,"days_open":5,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":5},"description":"Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change. Join us in powering a better world with inertial fusion!\nThis is a full-time, onsite role based at our headquarters in Denver, CO.\nWe are welcoming applicants for a Cryophysicist position on Xcimer’s Fill and Injection Station Team. The successful candidate will join a growing group of engineers and scientists aimed at developing the processes and technologies to build a first of its kind Inertial Fusion Energy fueling station for Xcimer’s fusion reactor plant. In this role, you will lead the experimental and theoretical design, characterization, and optimization of physical systems operating at ultra-low temperatures. You will manage relations and work closely with collaborators from national labs and universities to drive research objectives that will critically impact future system design and architecture. This is an entry- to mid-level role focused on experimental and theoretical R&D.\nResponsibilities\nExperimental Research\nDesign, build, and iterate on experiments aimed at advancing target filling processes and technologies.\nEvaluate, analyze, and improve system designs aimed at streamlining rapid target throughput.\nOwn the documentation and management of internal test stands and their experiments.\nPartner with a varied team of scientists, engineers, and designers to translate experience into realizable products.\nModeling and Simulation\nAdvance the team’s predictive capabilities utilizing COMSOL Multiphysics to model physical systems.\nLeverage Python to develop in-house simulations for thermal transport, fluid flow, and materials interactions.\nProvide insight into results from collaborators and internal experiments using analysis and modeling methods.\nOwn documentation and artifacts for developed models and simulations.\nWork Share Rotation\nSplit your time between the Xcimer Fill and Injection Station team and our external collaborators.\nServe as the primary contact for the knowledge transfer between our collaborators and Xcimer.\nBalance the role of being both mentor and mentee to both teams.\nResearch and Development\nProvide fresh perspectives on challenging engineering problems concerning high pressure, high vacuum, and cryogenic environments.\nOwn research tasks which will help push the team’s understanding of system capabilities and risks.\nIntegrate into an agile team focused on advancing technologies through rapid prototyping and reliance on the build-test-fail-repeat methodology.\nQualification\nEducation: Master’s + 3 years experience or PhD in applied physics, engineering physics, mechanical engineering, aerospace engineering, vacuum engineering, or related field\n Experience: 0 - 3+ years of experience in the fields of cryophysics, thermodynamics, superconducting magnetics, or similar background\nExpertise in ultra low temperature engineering and design with a focus on thermal transport, mechanical compatibility, or liquefaction\nDemonstrated experience on system design and integration teams.\nDemonstrated experience working in laboratory environments and hands-on experience with ultra-low temperature installations.\nDemonstrated experience building thermal, fluid flow, and materials models.\nExperience with both wet and dry cryogenic systems.\nExperience collaborating with a multidisciplinary team of engineers, scientists, and non-domain experts supporting system design.\nHighly self-motivated, with the ability to work independently without guidance.\nAdvanced verbal and written communications skills.\nMust be a U.S. citizen or national, U.S. permanent resident (current Green Card holder), or lawfully admitted into the E.S. as a refugee or granted asylum.\nDesired\nFamiliarity with instrumentation controls and scripts, specifically PyVISA and SCPI commands.\nFamiliarity with project life-cycle management and the AGILE structure.\nCryogenics handling safety training.\nExperience with vendor interactions and supply management.\nExperience working in a start-up or quick paced environment.\nBackground supporting team expansion and providing mentoring to junior contributors.\nExperience working on R&D teams or developing low TRL products.","description_format":"text","description_chars":4590,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"master","optional":false},"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Nuclear Energy","Lasers & Laser Systems","Air Defense"],"lifecycle":[{"event":"open","at":"2026-09-30T03:28:54Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":4,"expected_fill_days":133,"reasons":["conf:0","win:early"],"computed_at":"2026-10-04T05:45:00Z"},"pay":{"stated_usd_annual":165000,"is_top_pay":true},"html_url":"https://alion.io/job/xcimer-energy-cryophysicist","json_url":"https://alion.io/job/xcimer-energy-cryophysicist.json","meta":{"generated_at":"2026-10-05T02:16:11Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":2990,"day_limit":5000,"remaining_today":2010,"minute_limit":60,"resets_at":"2026-10-06T00:00:00Z"}}}