Radiant Nuclear competitors and alternatives
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.
- 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.
Radiant Nuclear and its competitors compared
Open roles are the postings Alion lists today; their change is shown only for career sites that state posting dates. Funding is the venture money on record. A dash means Alion holds no figure.
| Company | Open roles | Change | Raised | Last round | Lead investors | Employees | Headquarters | Main technologies | Hiring in |
|---|---|---|---|---|---|---|---|---|---|
Radiant Nuclear
This company
|
97 | – | – | – | – | 201-500 | El Segundo, United States | Python, C++, C# | United States |
Aalo Atomics
In common: Nuclear Energy · Python, SQL, C++ · headquarters in United States |
68 | +19%since Oct 12, 2026 | $127M | Venture round $100M2025 | – | 51-200 | Austin, United States | Python, SolidWorks, ASME NQA-1 | United States |
Valar Atomics
In common: Nuclear Energy · Python, SQL, C# · headquarters in United States |
113 | +19%since Oct 12, 2026 | $1.2B | Series B $1.2B2026 | – | 201-500 | El Segundo, United States | Python, SQL, OPC UA | United States |
Antares Nuclear
In common: Nuclear Energy · Python, SQL, C# · headquarters in United States |
77 | – | $380M | Venture round $60M2026 | – | 201-500 | Torrance, United States | Python, MATLAB, ASME NQA-1 | United States |
General Matter
In common: Nuclear Energy · Python, SQL, C# · headquarters in United States |
125 | +14%since Oct 12, 2026 | – | – | – | 51-200 | San Francisco, United States | Python, AutoCAD, C++ | United States |
Oklo
In common: Nuclear Energy · Python, C++, MATLAB · headquarters in United States |
43 | -32%since Oct 12, 2026 | – | – | – | 501-1000 | Santa Clara, United States | Python, SolidWorks, CI/CD | United States |
Last Energy
In common: Nuclear Energy · Python, SolidWorks, Verification & Validation · headquarters in United States |
22 | -19%since Oct 12, 2026 | – | – | – | 201-500 | Austin, United States | SolidWorks, Python, AutoCAD | United States, United Kingdom |
Xcimer Energy
In common: Nuclear Energy · Python, SQL, C# · headquarters in United States |
63 | – | $101.2M | Series A $100M2024 | Hedosophia | 201-500 | Denver, United States | Python, MATLAB, C++ | United States |
Kairos Power
In common: Nuclear Energy · Python, SQL, C++ · headquarters in United States |
64 | +83%since Oct 12, 2026 | $100M | Venture round $100M2026 | – | 201-500 | Alameda, United States | SolidWorks, Python, MATLAB | United States |
X-energy
In common: Nuclear Energy · Python, SQL, MATLAB · headquarters in United States |
97 | – | – | – | – | 1001-5000 | Rockville, United States | Verification & Validation, AWS, Function Calling | United States |
Fuse
In common: Nuclear Energy · Python, C++, MATLAB · headquarters in United States |
42 | – | – | – | – | 51-200 | Palo Alto, United States | Python, C++, MATLAB | United States, Canada |
How the list is made
The list comes from Alion's similar-companies engine, the same one AI agents query through the Alion MCP server. A company ranks higher when it shares more of Radiant Nuclear's industry segments and is less spread over others, when its job postings name the same technologies, when it is headquartered in the same country and when its size is close. The list is rebuilt every week.
How to cite this page
These figures are published under a free licence. You may reuse them, including commercially, as long as you credit Alion and link back to this page.
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