Radiant · 2 days ago
Nuclear Engineer
El Segundo, CA
Full-time
Onsite
Entry, Mid Level
1+ years expRadiant is a startup based in El Segundo, CA, focused on developing portable nuclear microreactors. The Nuclear Engineer will be responsible for developing nuclear engineering solutions for the Kaleidos microreactor, including areas such as radiation shielding and reactor physics modeling, while collaborating with a team in a fast-paced environment.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Ownership of Nuclear design and analysis, examples include:
Shielding: Operational dose and shutdown activation analysis, waste categorization, and alignment of shielding design to customer and regulatory requirements
Neutronics: Analysis of ex-vessel reactor fluxes and energy deposition, criticality safety, and verification and validation (V&V) of the nuclear toolbox and reactor models
Accident and Dose Consequence: Radiological dose consequence from different accident scenarios for the Kaleidos demonstration and production units
Transient Analysis: Run coupled neutronics and thermal calculations to further understanding of the reactor dynamics of the Kaleidos reactor design
Collect requirements, provide expertise and feedback to engineers in other functional areas via clear, constructive communication
Other nuclear design and analysis duties as assigned
Qualification
Required
Bachelor's degree in nuclear engineering or equivalent degree from an accredited institution
1-2+ years of nuclear engineering industry experience (MS equivalent to 2 yrs)
Experience with radiation transport methods, including with codes such as MCNP/OpenMC/Serpent
Proficient in at least one of the following programming languages: Python, C++, C#, FORTRAN, or another scientific computing language
Basic knowledge of thermal hydraulic principles
Self-motivated with strong organizational, written, and oral communication skills
Experience working in an engineering organization and developing high-quality work
Preferred
Experience with variance reduction techniques and associated software (Attila4MC and/or ADVANTG) is a plus
Strong experience with OpenMC, Serpent, MCNP, Attila4MC, MOOSE, RELAP, Pronghorn, GRIFFIN, or other similar nuclear software packages
Competency in distributed software development processes and high-performance computing environments
Familiarity with CAD design software (NX, SolidWorks, and/or SpaceClaim) is a plus
Familiarity with dose consequence methods and software such as MAACS or NRC-RADTRAN
At least 1 year of software development or scripting experience
Hands-on experience designing hardware and/or performing tests
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