{"id":853054,"url":"https://alion.io/job/radiantnuclear-nuclear-engineer-sensors","title":"Nuclear Engineer, Sensors","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":88,"open_postings":26,"ghost_share":0,"stale_share":0.5,"repost_share":0,"time_to_fill_p50_days":53,"computed_at":"2026-11-01T06:10:25Z"}},"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":["El Segundo, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":115175,"max":162225,"currency":"USD","period":"year","gross":null,"usd_annual":162225},"salary_estimate":null,"experience_years_min":1,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"Fortran","optional":false},{"name":"MCNP","optional":false},{"name":"Python","optional":false},{"name":"Verification & Validation","optional":false},{"name":"SolidWorks","optional":true}],"status":"live","first_seen_at":"2026-09-11T23:39:23Z","employer_posted_date":"2026-09-11","last_verified_at":"2026-11-02T01:48:08Z","board_verified":true,"closed_at":null,"days_open":51,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":51},"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.\nAbout the Role\nRadiant is seeking a highly motivated Nuclear Engineer, Sensors to own sensor and instrumentation solutions for our Kaleidos microreactor. This includes radiation detection, neutron flux monitoring, and instrumentation design and qualification for reactor physics, shielding, and safety analysis applications. You will lead and own instrumentation initiatives and studies, strategic direction, and work closely with a collaborative nuclear and engineering team in a fast-paced startup environment. The ideal candidate is passionate about advanced reactor design, detail-oriented, effectively communicates, and has a tenacity to solve interesting technical challenges.\nResponsibilities & Duties\nOwnership of sensor and instrumentation design and analysis, examples include:\nRadiation Detection: Design, specify, and qualify in-core and ex-core detector systems (fission chambers, ion chambers, and other detector technologies) for neutron flux and radiation monitoring.\n\nDetector Modeling: Support detector response modeling and verification using radiation transport codes to ensure sensor design meets performance requirements.\n\nEnvironmental Qualification: Evaluate and validate sensor survivability and performance under high-temperature, high-radiation, and accident-condition environments.\n\nSystems Integration: Partner with reactor control and data acquisition (DAQ) engineers to integrate sensor outputs into reactor monitoring, protection, and control systems.\n\nVerification & Validation: Support V&V of instrumentation against customer and regulatory requirements.\n\nCollect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication.\n\nOther nuclear instrumentation and sensor design/analysis duties as assigned.\n\nRequired Qualifications & Skills\nBachelor's degree in nuclear engineering or equivalent degree from an accredited institution.\n\n1-2+ years of nuclear engineering industry experience (MS equivalent to 2 yrs), with exposure to radiation detection or instrumentation.\n\nExperience with radiation transport methods, including with codes such as MCNP/OpenMC/Serpent.\n\nProficient in at least one of the following programming languages: Python, C++, C#, FORTRAN, or another scientific computing language.\n\nBasic knowledge of thermal hydraulic principles.\n\nSelf-motivated with strong organizational, written, and oral communication skills.\n\nExperience working in an engineering organization and developing high-quality work.\n\nDesired Qualifications & Skills\nHands-on experience designing, testing, or qualifying sensors/instrumentation in harsh environments (high temperature, high radiation).\n\nExperience with data acquisition (DAQ) systems and integration with reactor control systems.\n\nExperience with variance reduction techniques and associated software (Attila4MC and/or ADVANTG), is a plus.\n\nCompetency in distributed software development processes and high-performance computing environments.\n\nFamiliarity with CAD design software (NX, SolidWorks, and/or SpaceClaim), is a plus.\n\nFamiliarity with dose consequence methods and software such as MAACS or NRC-RADTRAN.\n\nAt least 1 year of software development or scripting experience.\n\nHands-on experience designing hardware and/or performing tests.\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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