{"id":1753409,"url":"https://alion.io/job/radiant-nuclear-senior-software-engineer-front-end","title":"Senior Software Engineer, Frontend","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":"2026-10-12T06:55:09Z"}},"role":"Frontend","role_family":"Frontend","seniority":"senior","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":158000,"max":219450,"currency":"USD","period":"year","gross":null,"usd_annual":219450},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"PixiJS","optional":false},{"name":"Playwright","optional":false},{"name":"React Router","optional":false},{"name":"React.js","optional":false},{"name":"TypeScript","optional":false},{"name":"Vite","optional":false},{"name":"Vitest","optional":false},{"name":"WebGPU","optional":false},{"name":"WebRTC","optional":false},{"name":"WebSockets","optional":false},{"name":"Axum","optional":true},{"name":"FastAPI","optional":true},{"name":"JavaScript","optional":true},{"name":"Python","optional":true},{"name":"Rust","optional":true}],"status":"live","first_seen_at":"2026-10-02T18:16:51Z","employer_posted_date":"2026-10-02","last_verified_at":"2026-10-12T10:29:46Z","board_verified":true,"closed_at":null,"days_open":9,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":9},"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 Senior Software Engineer to own the frontend for our in-house telemetry and fleet management platform. You’ll join the Mission Software team, build on top of a highly technical telemetry streaming platform, and work on fleet monitoring systems for Radiant’s portable nuclear reactor, Kaleidos. You’ll also build additional features for engineers and operators, adding new data analysis and configuration capabilities to a critical platform. The ideal candidate is outgoing and organized, ready to collaborate with other engineers. The code you write will help design, run, and mass-produce the first high-temperature gas-cooled portable microreactor ever to be commercialized.\nResponsibilities & Duties\nOwn critical parts of the frontend for our internal telemetry and fleet management platform, working in a modern React + TypeScript + Vite codebase.\n\nDevelop highly reliable, performant systems for data review and analysis.\n\nDevelop frontend pages for complex device configuration and telemetry systems.\n\nCollaborate with other members of the Mission Software team and reach consensus among stakeholders across the company.\n\nRequired Qualifications & Skills\nBachelor's degree in Computer Science, Engineering, Physics, or a related technical field.\n\n5+ years of professional experience in web development, frontend development, and / or desktop GUI development.\n\nProficient in using React + TypeScript for SPAs, testing with Vitest + Playwright\n\nExperience building highly performant, complex, mission-critical systems using technologies like WebSockets, WebRTC, or SSE.\n\nHas worked on a complicated UI system before, driving forward critical features\n\nStrong code review & debugging skills.\n\nDesired Qualifications & Skills\nExperience using the following technologies: TanStack Query + React Router, Pixi.js + WebGPU, Yjs or similar CRDT\n\nHMI or dashboarding design experience\n\nHands-on hardware tech experience, working closely with hardware engineers to develop deeply coupled applications.\n\nOur Tech Stack:\nTypescript\n\nReact\n\nVite\n\nPixi.js & Yjs\n\nRust + Axum Web / Python + FastAPI\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. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.","description_format":"text","description_chars":5233,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Equity","Parental leave"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-03T09:47:09Z"}],"visa":[],"liveness":{"score":90,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.903,"p_room":1,"age_days":9,"expected_fill_days":89,"reasons":["conf:2","velocity","win:early"],"computed_at":"2026-10-12T06:55:09Z"},"pay":{"stated_usd_annual":219450,"is_top_pay":true},"html_url":"https://alion.io/job/radiant-nuclear-senior-software-engineer-front-end","json_url":"https://alion.io/job/radiant-nuclear-senior-software-engineer-front-end.json","meta":{"generated_at":"2026-10-12T11:27:13Z","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":17772,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-13T00:00:00Z"}},"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":690814},"rest":"https://alion.io/mcp/rest/get_company?id=690814"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fradiant-nuclear-senior-software-engineer-front-end"},{"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%2Fradiant-nuclear-senior-software-engineer-front-end"},{"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%2Fradiant-nuclear-senior-software-engineer-front-end"},{"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/radiant-nuclear-senior-software-engineer-front-end\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fradiant-nuclear-senior-software-engineer-front-end"}]}