Director, Nuclear Engineering

Radiant is an El Segundo CA-based startup building the worlds first mass-produced portable nuclear microreactors. The companys first reactor Kaleidos is a 1-megawatt fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals data centers remote sites and military bases. Radiants unique practical approach to nuclear development leverages modern software engineering to rapidly deliver safe factory-built microreactors that use existing well-qualified materials. Founded in 2020 Radiant is on track to test its first reactor at the Idaho National Laboratory this summer with initial customer deliveries beginning in 2028.

Radiant is seeking a highly motivated Director Nuclear Engineering to organize nuclear design and analysis strategy spanning the design operation and iteration of our microreactor fleet.

Responsibilities & Duties:

• Lead and grow a team of nuclear engineers spanning core physics shielding performance dose and consequence analysis and nuclear instrumentation domains

• Manage team execution to efficiently deliver against the strategy remove roadblocks and adapt to shifting priorities

• Identify manage and effectively communicate technical schedule and regulatory risks

• Develop and standardize analysis roadmaps to enable fast iteration across multiple reactor programs

• Foster an attitude of ownership and mentorship within the team

• Define the approach to nuclear engineering design margins and methodical peer reviews

• Interact with universities national labs and other outside entities as necessary to accomplish key objectives

Required Qualifications & Skills:

• Hold a degree in nuclear engineering physics or engineering physics from an accredited institution

• Minimum 10 years of experience managing a team in reactor design and analysis

• Fluency in engineering first principles across nuclear thermal electrical and mechanical domains

• Excellence in communicating nuclear engineering concepts to a multidisciplinary audience

• Familiarity with DOE authorization and/or NRC requirements and processes and demonstrated experience with the development of nuclear facility safety bases

• Must be willing to relocate to Radiants El Segundo office

• Experience with Monte Carlo neutron transport codes including OpenMC Serpent or MCNP

Desired Qualifications & Skills:

• Hands-on experience designing products hardware or tests

Additional Requirements:

• Must be willing to work extended hours and weekends as necessary to accomplish our mission

• Must work 100% onsite at El Segundo HQ

• Stock: Substantial incentive stock plan for all full-time employees.

• Medical: 100% up to base silver level plan for employee 50% dependents offers up to Platinum plans.

• One Medical: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage 50% for dependents.

• Dental: 100% top tier plan coverage orthodontia extra 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.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiants new hire compensation package includes base salary substantial equity grants and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance experience education and qualifications and are designed to support continued growth as scope responsibility and impact expand at Radiant.

The best of todays advanced reactor builders dont wait for job postings. They join the winning team. If thats you contact us directly for immediate opportunities: .

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race color religion sex sexual orientation gender identity or expression pregnancy age national origin disability status genetic information protected veteran status or any other characteristic protected by law.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicants capacity to serve in compliance with U.S. export controls.

Required Experience:

Director