Senior Manager, Power Systems

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 talented Senior Manager Power Systems to build and lead the team that designs models and validates electrical power systems for our nuclear microreactor platform. You will manage a team of power systems and power electronics engineers set technical direction and priorities and ensure the team delivers safe stable and reliable power across grid-connected islanded rapidly deployable and space-based environments.

In this role you will guide your team through power system studies from early architecture tradeoffs through detailed modeling testing and system validation while also driving the development of in-house power electronics including converters inverters and generator controls needed to support both terrestrial and space-based reactor platforms. This role is central to commercializing Earths first mass-produced portable nuclear reactors and to extending that capability beyond Earth.

• Build manage and grow a team of power systems and power electronics engineers including hiring mentoring and performance management.

• Set team priorities and roadmaps in partnership with leadership from power conversion controls nuclear and software.

• Communicate progress risks and results to executive leadership and cross-functional stakeholders.

• Lead the team that owns power system architecture single-line diagrams and synchronization strategy for single and multi-reactor configurations grid-connected and islanded.

• Direct FMEAs and disturbance analysis (load steps faults breaker operations loss-of-generation) to validate system stability and protection behavior.

• Own architecture sizing and integration of off-the-shelf hardware for energy storage and power conversion.

• Lead in-house power electronics development (converters inverters generator controls) to support earth and space-based reactor platforms.

• Oversee SIL/HIL and system-level testing commissioning and regulatory/power-quality compliance.

• B.S. in Electrical Engineering with an emphasis in power systems or control systems.

• 8 years of experience designing power systems for generation microgrids or mission-critical power systems.

• 3 years of experience in a formal people management role.

• Experience with sizing and integrating high-voltage battery systems with power electronics.

• Track record developing power electronics for high-power medium-voltage equipment including transformers switchgear inverters active rectifiers DC/DC converters and generator controls.

• Background in leading teams with power system modeling and simulation tools (e.g. PSCAD ETAP PSSE Simulink or equivalent).

• Solid understanding of power system control modes (grid-forming grid-following droop control).

• Experience in analyzing system stability protection behavior and fault response in complex electrical systems.

• Proven ability to lead and develop engineering teams while remaining technically hands-on.

• Ability to clearly communicate technical concepts and results to cross-functional teams and leadership.

• M.S. in Electrical Engineering or related discipline.

• 5 years of experience in a formal people management role.

• Experience with islanded power systems supporting critical loads.

• Familiarity with interconnection requirements grid codes and relevant IEEE or utility standards.

• Experience in modeling dynamic loads and fast-changing electrical demand.

• Exposure to nuclear aerospace defense or other highly regulated industries.

• Track record of building or scaling an engineering team on complex safety-critical programs.

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

• Must work 100% onsite at Radiants 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:

Senior Manager