{"id":2389214,"url":"https://alion.io/job/radiant-nuclear-lead-nuclear-materials-engineer","title":"Lead Nuclear Materials Engineer","company":{"id":690814,"name":"Radiant Nuclear","domain":"radiantnuclear.com","url":"https://alion.io/company/radiantnuclear","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":92,"open_postings":26,"ghost_share":0,"stale_share":0.115,"repost_share":0,"time_to_fill_p50_days":89,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["El Segundo, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":140500,"max":202475,"currency":"USD","period":"year","gross":null,"usd_annual":202475},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-10-12T17:29:01Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-14T01:32:44Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"About Radiant\nRadiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.\nLead Nuclear Materials Engineer\nRadiant is seeking a highly motivated Lead Nuclear Materials Engineer to lead Radiant’s nuclear materials team in the development, testing, and qualification of materials and related manufacturing processes used in the Kaleidos 1MWe nuclear microreactor. The ideal candidate is excited to grow an in-house nuclear materials team, is proficient in materials selection, testing, and analysis, takes great ownership of their work end-to-end, and thrives in a highly cross-functional, fast-paced environment. Your team’s ownership spans fuel, moderators, shielding, neutron poisons, and irradiation testing. You will be a key contributor to building the world's first mass-produced, rapidly-deployable nuclear reactor.\nResponsibilities & Duties\nSet the technical direction for the nuclear materials team, including the definition of project scopes, the guidance of day-to-day engineering and support activities, and the development of a nuclear materials roadmap to support future reactor designs and builds\n\nDeliver materials solutions for fuel, moderator, shielding, and neutron poison designs for Kaleidos\n\nAccountable for nuclear materials engineering team’s technical output\n\nLead and mentor team members technically and professionally\n\nCommunicate project status, issues, and schedules to teammates and executives\n\nPresent to external stakeholders and regulatory bodies (DOE, NRC)\n\nReview test plans, purchase orders, and analysis\n\nProvide surge materials engineering support as-needed\n\nManage irradiation testing from design of experiment through irradiation to post irradiation examination (PIE)\n\nRequired Qualifications & Skills\nBachelor’s degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a materials science and engineering focus.\n\n5+ years of experience working in the development, testing, and/or analysis of nuclear materials for demanding load cases and environments\n\nHands-on experimental or testing experience in laboratory or production environments\n\nDesired Qualifications & Skills\nMaster’s or PhD degree from an accredited institution in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with a materials science and engineering focus.\n\n2+ years of engineering leadership and management experience at a company building and/or testing hardware for nuclear, aerospace, or other extreme environments\n\nExpert-level competency in at least one area of nuclear materials such as fuel, neutron poisons, shielding, or moderators\n\nExperience with development and qualification of material systems for use in high temperature and irradiation environments.\n\nKnowledge of standard test methods for materials and experience with development of design allowables.\n\nSelf-motivated with strong organizational, written, and oral communication skills.\n\nDemonstrated ability to work collaboratively with design and operations teams to deliver high-value results.\n\nExperience with using text-based software development tools (Python or similar).\n\nAdditional Requirements:\nMust be willing to work extended hours and weekends as necessary to accomplish our mission.\n\nMust work 100% onsite at El Segundo HQ.\n\nBenefits and Perks\nStock: Substantial incentive stock plan for all full-time employees.\n\nMedical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.\n\nOne Medical: Sponsored memberships for employees and their dependents.\n\nVision: 100% top tier plan coverage + 50% for dependents.\n\nDental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.\n\nVoluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.\n\n8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.\n\nDaily catered lunch. Free snacks and drinks.\n\nFlexible PTO policy. Remote workday allocation.\n\nCompany and team-bonding events, happy hours and in-person camaraderie.\n\nBeautiful El Segundo headquarters close to the Pacific Ocean.\n\nTotal Compensation and Benefits\nRadiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.\nThe best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: .\nWe are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.\nThis position involves access to technology that is subject to U.S. export controls. 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