{"id":231306,"url":"https://alion.io/job/antares-nuclear-inc-nuclear-engineer-iii","title":"Nuclear Engineer II","company":{"id":1877835,"name":"Antares Nuclear","domain":"antaresindustries.com","url":"https://alion.io/company/antaresindustries","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":85,"open_postings":5,"ghost_share":0,"stale_share":0.6,"repost_share":0,"time_to_fill_p50_days":50,"computed_at":"2026-11-05T05:54:30Z"}},"role":"Energy","role_family":"Energy","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":["Los Angeles, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":120000,"max":175000,"currency":"USD","period":"year","gross":null,"usd_annual":175000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"MCNP","optional":false},{"name":"Python","optional":true}],"status":"live","first_seen_at":"2026-06-24T23:24:18Z","employer_posted_date":"2026-06-24","last_verified_at":"2026-11-05T23:12:28Z","board_verified":true,"closed_at":null,"days_open":134,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":134},"description":"About Us\nAt Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, elevate global living standards, and expand humanity's presence in outer space. To achieve our mission, we’re building mass-producible, inherently safe, deployable microreactors that can be used terrestrially, underwater, and in space.\nThe Antares team hails from SpaceX, the White House, the Pentagon, the Department of Energy, MIT, Rigetti Computing, General Atomics, Relativity Space, Ursa Major, and National Laboratories like Idaho, Oak Ridge, Los Alamos, and Savannah River. Antares has raised over $600M in venture capital from top-tier investors and has hundreds of million-dollars on contract with the military services, NASA, and the Department of Energy.\nAbout the Role\nAs a member of the nuclear engineering team, you will become the responsible engineer for a key component of the Antares reactor design such as reactivity controls and instrumentation, radiation shielding, fuels, materials, thermal hydraulics, safety, or licensing. The ideal candidate has a mix of industry and academic experience, and has worked in a team-oriented environment to mature nuclear concepts. While you may have a specialty, you’re not afraid to operate as a generalist in a growing organization.\nRoles and Responsibilities:\nAssist with neutronics modeling and simulations using MCNP, Serpent, or SCALE\n\nSupport Multiphysics analyses (thermal-hydraulics, heat transfer, structural mechanics)\n\nParticipate in experimental validation of simulation results\n\nCollaborate with senior engineers on iterative design tasks\n\nContribute to documentation and regulatory reporting\n\nParticipate in hardware demonstrations and prototype testing\n\nBasic Qualifications:\nBachelor's degree in Nuclear Engineering or related technical field\n\nFamiliarity with neutron transport software (MCNP, Serpent, SCALE)\n\nPreferred Skills & Experience:\nFamiliarity with Python or similar programming language\n\nCoursework or internships involving Multiphysics modeling\n\nInterest or experience in microreactors, heat pipe cooled reactors, or other advanced reactors\n\nExposure to fast-paced project environments\n\nProven ability to quickly learn new technical concepts\n\nStrong communication skills\n\nPay Ranges\nNuclear Engineer I: 120k-135k\nNuclear Engineer II: 135k-165k\nYour actual level and base salary will be determined on a case-by-case basis and may vary based on the following considerations: job-related knowledge and skills, education, and experience.\nCulture\nAt Antares, we like to specifically tie each role to our founding document’s set of values-here are the top five cultural values we think you should believe at your core to be successful:\nThink in Systems - Energy and Defense are complex ecosystems with numerous stakeholders with competing priorities, conflicting policies, perverse incentives, and emergent and path-dependent properties. First principles thinking alone is insufficient. Think probabilistically and then take action. “If you want to be certain, then you are apt to be obsolete.” Over-optimizing the components often degrades the system\n\nObsess over the End User - The customer and end user are often not the same. We will never build globally competitive commercial products if we lose sight of our end users and their entire interaction with the product life cycle\n\nBe Unconstrained by Convention - Our only limits are the laws of physics. Many, even experts, will say what we are working on is impossible. They said the same about SpaceX reusing rockets. Generationally impactful companies, by definition, must accomplish the seemingly impossible. If it were easy, it would have already been done. Never shy away from a solution because it has never been tried before, and never choose to do something because that's “how it's always been done”\n\nGo Where the Work Is - Never miss a chance to meet a customer, user, or stakeholder face to face, even if that means hopping on a plane. If you can’t make it, find a teammate who can channel your intentions and go in your place. Deep work can be done from anywhere, but we believe teams are built in person, and aim to maximize our time together\n\nOperate in the Grey - Embrace nuance in pursuit of truth. Question every fundamental assumption\n\nEqual Opportunity\nAntares is an Equal Opportunity Employer. Employment decisions are based solely on merit, competence, and qualifications, without regard to race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability, or any other legally protected status.\nITAR Requirements\nTo conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. 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