Radiant · 4 days ago
Senior Nuclear Engineer
El Segundo, California, United States
Full-time
Onsite
Mid, Senior Level
4+ years expRadiant is a startup based in El Segundo, CA, focused on developing portable nuclear microreactors. The Senior Nuclear Engineer will be responsible for modeling methods and reactor physics calculations to support safety analyses, playing a key role in the commercialization of the first mass-produced nuclear reactor.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Own modeling methods of core neutronics and reactor physics calculations supporting Radiant’s transient safety analyses
Perform calculations of energy deposition distributions, reactivity coefficients, kinetics parameters, and control blade worths to input into Digital Twin models
Verify assumptions and assess conservatism of neutronics models
Document methods for both technical and non-technical audiences
Assist in Verification & Validation (V&V) efforts for the Digital Twin
Review and support other nuclear analyses across the company in reactor physics, shielding, and radiation detection
Qualification
Required
Bachelor's degree in nuclear engineering or a similar field from an accredited institution
4+ years of experience with Monte Carlo nuclear engineering software such as OpenMC, MCNP, Serpent, SCALE, etc
Experience documenting analysis methods and assumptions
Strong programming skills in any language, preferably Python
Preferred
Knowledge and experience in reactor kinetics
Basic knowledge of thermal hydraulic principles
Experience communicating and distilling information with cross-functional teams
Driven, self-motivated, and takes ownership of work end to end
Benefits
Stock: Substantial incentive stock plan for all full-time employees.
Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
One Medical: Sponsored memberships for eligible employees and their dependents.
Vision: 100% premium coverage for top tier plan + 50% for dependents.
Dental: 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