{"company":{"id":690814,"name":"Radiant Nuclear","domain":"radiantnuclear.com","url":"https://alion.io/company/radiantnuclear"},"answer":"As of Nov 13, 2026, Alion lists 10 companies most like Radiant Nuclear: Aalo Atomics, Valar Atomics, Antares Nuclear, General Matter, Oklo, Last Energy, Xcimer Energy, Kairos Power, X-energy and Fuse.","highlights":["Radiant Nuclear itself has 97 open roles on Alion.","Of them, General Matter is hiring the most, with 125 open roles.","Valar Atomics has raised the most venture funding on record: $1.2B.","Open roles at Kairos Power rose the most: from 35 on Oct 12, 2026 to 64 now."],"as_of":"2026-11-13","cite":"Alion, \"Radiant Nuclear competitors and alternatives: 10 similar companies compared on hiring and funding\", as of Nov 13, 2026. https://alion.io/company/radiantnuclear/competitors","indexable":true,"target":{"name":"Radiant Nuclear","url":"https://alion.io/company/radiantnuclear","domain":"radiantnuclear.com","open_roles":97,"open_roles_change":null,"funding":{"total_raised_usd":null,"last_round":null,"last_round_usd":null,"last_round_date":null,"lead_investors":[]},"size_band":"201-500","headquarters":{"city":"El Segundo","country":"US"},"technologies":["Python","C++","C#"],"hiring_countries":["US"],"similarity":null},"competitors":[{"name":"Aalo Atomics","url":"https://alion.io/company/aalo","domain":"aalo.com","open_roles":68,"open_roles_change":{"since":"2026-10-12","from":57,"to":68,"pct":19},"funding":{"total_raised_usd":127000000,"last_round":"venture","last_round_usd":100000000,"last_round_date":"2025-08-19","lead_investors":[]},"size_band":"51-200","headquarters":{"city":"Austin","country":"US"},"technologies":["Python","SolidWorks","ASME NQA-1"],"hiring_countries":["US"],"similarity":{"score":18.8,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","C++","MATLAB","Fortran"],"same_hq_country":true}},{"name":"Valar Atomics","url":"https://alion.io/company/valar-atomics","domain":"valaratomics.com","open_roles":113,"open_roles_change":{"since":"2026-10-12","from":95,"to":113,"pct":19},"funding":{"total_raised_usd":1200000000,"last_round":"series_b","last_round_usd":1200000000,"last_round_date":"2026-08-10","lead_investors":[]},"size_band":"201-500","headquarters":{"city":"El Segundo","country":"US"},"technologies":["Python","SQL","OPC UA"],"hiring_countries":["US"],"similarity":{"score":18.35,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","C#","C++","MATLAB"],"same_hq_country":true}},{"name":"Antares Nuclear","url":"https://alion.io/company/antaresindustries","domain":"antaresindustries.com","open_roles":77,"open_roles_change":null,"funding":{"total_raised_usd":379999219,"last_round":"venture","last_round_usd":59999682,"last_round_date":"2026-08-03","lead_investors":[]},"size_band":"201-500","headquarters":{"city":"Torrance","country":"US"},"technologies":["Python","MATLAB","ASME NQA-1"],"hiring_countries":["US"],"similarity":{"score":17.28,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","C#","C++","MATLAB"],"same_hq_country":true}},{"name":"General Matter","url":"https://alion.io/company/general-matter","domain":"generalmatter.com","open_roles":125,"open_roles_change":{"since":"2026-10-12","from":110,"to":125,"pct":14},"funding":{"total_raised_usd":null,"last_round":null,"last_round_usd":null,"last_round_date":null,"lead_investors":[]},"size_band":"51-200","headquarters":{"city":"San Francisco","country":"US"},"technologies":["Python","AutoCAD","C++"],"hiring_countries":["US"],"similarity":{"score":16.8,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","C#","C++","MATLAB"],"same_hq_country":true}},{"name":"Oklo","url":"https://alion.io/company/oklo-inc","domain":"oklo.com","open_roles":43,"open_roles_change":{"since":"2026-10-12","from":63,"to":43,"pct":-32},"funding":{"total_raised_usd":null,"last_round":null,"last_round_usd":null,"last_round_date":null,"lead_investors":[]},"size_band":"501-1000","headquarters":{"city":"Santa Clara","country":"US"},"technologies":["Python","SolidWorks","CI/CD"],"hiring_countries":["US"],"similarity":{"score":16.7,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","C++","MATLAB","SolidWorks","Digital Twin"],"same_hq_country":true}},{"name":"Last Energy","url":"https://alion.io/company/lastenergy","domain":"lastenergy.com","open_roles":22,"open_roles_change":{"since":"2026-10-12","from":27,"to":22,"pct":-19},"funding":{"total_raised_usd":null,"last_round":null,"last_round_usd":null,"last_round_date":null,"lead_investors":[]},"size_band":"201-500","headquarters":{"city":"Austin","country":"US"},"technologies":["SolidWorks","Python","AutoCAD"],"hiring_countries":["US","GB"],"similarity":{"score":16.35,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SolidWorks","Verification & Validation","Siemens NX","Abaqus"],"same_hq_country":true}},{"name":"Xcimer Energy","url":"https://alion.io/company/xcimer","domain":"xcimer.energy","open_roles":63,"open_roles_change":null,"funding":{"total_raised_usd":101240000,"last_round":"series_a","last_round_usd":100000000,"last_round_date":"2024-06-04","lead_investors":["Hedosophia"]},"size_band":"201-500","headquarters":{"city":"Denver","country":"US"},"technologies":["Python","MATLAB","C++"],"hiring_countries":["US"],"similarity":{"score":15.98,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","C#","C++","MATLAB"],"same_hq_country":true}},{"name":"Kairos Power","url":"https://alion.io/company/kairospower","domain":"kairospower.com","open_roles":64,"open_roles_change":{"since":"2026-10-12","from":35,"to":64,"pct":83},"funding":{"total_raised_usd":100000000,"last_round":"venture","last_round_usd":100000000,"last_round_date":"2026-09-21","lead_investors":[]},"size_band":"201-500","headquarters":{"city":"Alameda","country":"US"},"technologies":["SolidWorks","Python","MATLAB"],"hiring_countries":["US"],"similarity":{"score":15.95,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","C++","MATLAB","Fortran"],"same_hq_country":true}},{"name":"X-energy","url":"https://alion.io/company/x-energy","domain":"x-energy.com","open_roles":97,"open_roles_change":null,"funding":{"total_raised_usd":null,"last_round":null,"last_round_usd":null,"last_round_date":null,"lead_investors":[]},"size_band":"1001-5000","headquarters":{"city":"Rockville","country":"US"},"technologies":["Verification & Validation","AWS","Function Calling"],"hiring_countries":["US"],"similarity":{"score":15.55,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","SQL","MATLAB","SolidWorks","Digital Twin"],"same_hq_country":true}},{"name":"Fuse","url":"https://alion.io/company/f-2","domain":"f.energy","open_roles":42,"open_roles_change":null,"funding":{"total_raised_usd":null,"last_round":null,"last_round_usd":null,"last_round_date":null,"lead_investors":[]},"size_band":"51-200","headquarters":{"city":"Palo Alto","country":"US"},"technologies":["Python","C++","MATLAB"],"hiring_countries":["US","CA"],"similarity":{"score":15.5,"shared_segments":["Nuclear Energy"],"shared_technologies":["Python","C++","MATLAB","Fortran","SolidWorks"],"same_hq_country":true}}],"method":"Ranked by Alion's similar-companies engine (the MCP tool similar_companies): shared industry segments and the overlap of the two segment sets, technologies named in both companies' job postings, the same headquarters country, a size band near it. Open roles are the visible postings on Alion today; their change is shown only for boards that state posting dates.","html_url":"https://alion.io/company/radiantnuclear/competitors","json_url":"https://alion.io/company/radiantnuclear/competitors.json","license":"CC BY-SA 4.0","meta":{"source":"Alion","built_at":"2026-11-13T08:51:28Z","generated_at":"2026-11-13T10:46:09Z"}}