Radiant · 6 hours ago
Nuclear Engineer, Core Physics
El Segundo, CA
Full-time
Onsite
Entry, Mid Level
2+ years expRadiant is an El Segundo, CA-based startup focused on building portable nuclear microreactors. They are seeking a Nuclear Engineer responsible for designing and implementing testing operations for their demonstration campaign, ensuring safety and compliance with testing objectives.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
U.S. Citizen Only
Responsibilities
Collect testing requirements, objectives, and success criteria from nuclear engineers
Develop procedures that satisfy test requirements within the operational bounds of Kaleidos
Perform various reactor physics calculations (neutronic and transient analyses) to verify proposed testing sequence addresses all requirements
Document testing procedures and support operator training and control room GUI development
Qualification
Required
Bachelor's degree in nuclear engineering or equivalent degree from an accredited institution
2+ years of experience with reactor operations
Experience with radiation transport methods, including with codes such as MCNP/OpenMC/Serpent
Knowledge of thermal hydraulic fundamentals
Must be willing to work extended hours and weekends as necessary to accomplish our mission
Must work 100% onsite at El Segundo HQ
Preferred
4+ years of experience with reactor operations
Direct experience as a reactor operator of an existing nuclear reactor
Hands-on experience in developing technical procedures, human factors engineering, or operational interface design
Benefits
Substantial incentive stock plan for all full-time employees.
100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
Sponsored memberships for eligible employees and their dependents.
100% premium coverage for top tier plan + 50% for dependents.
100% premium coverage for top tier plan (including orthodontia) + 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
Daily catered lunch. Free snacks and drinks.
Flexible PTO policy. Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
51-200 employees
Funding
Current Stage
Late StageTotal Funding
$518.82MKey Investors
Andreessen HorowitzUnion Square Ventures
2025-12-17Series D· $300M
2024-11-14Series C· $165M
2023-04-18Series B· $40M
Leadership Team
Doug Bernauer
Chief Executive Officer
Recent News
2026-01-07
The Motley Fool
2026-01-04
Globe and Mail
2026-01-03
Company data provided by crunchbase