Senior Power Systems Engineer

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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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 utilizes modern software engineering to rapidly achieve safe factory-built microreactors that leverage existing well-qualified materials. Founded in 2020 Radiant is on track to test its first reactor next year at the Idaho National Laboratory with initial customer deliveries beginning in 2028.

Radiant is seeking a talented Senior Power Systems Engineer to lead the design modeling and validation of electrical power systems supporting our nuclear microreactor platform. You will play a critical role in defining how power is generated conditioned controlled and delivered to customers across grid-connected islanded and rapidly deployable environments.

In this role you will own power system studies from early architecture tradeoffs through detailed modeling testing and system validation. Youll collaborate closely with electrical design controls turbomachinery nuclear thermal and software teams to ensure safe stable and reliable power delivery under a wide range of operating and contingency conditions. This role is central to commercializing Earths first mass-produced portable nuclear reactors.

Responsibilities and Duties:

• Own power system modeling and analysis for microreactor-based power generation systems operating in grid-connected and islanded modes
• Develop and maintain steady-state dynamic and EMT models representing generation assets loads protection schemes and supervisory controls
• Perform power flow fault protection coordination and system stability studies to validate performance across normal and contingency conditions
• Evaluate system behavior during disturbances such as load steps faults breaker operations and loss-of-generation events.
• Support design trade studies to optimize power system architecture control strategies and equipment selection
• Collaborate cross-functionally to align power system models with electrical hardware design control logic communication delays and protection schemes
• Participate in software-in-the-loop (SIL) hardware-in-the-loop (HIL) and system-level testing to validate model fidelity and control performance
• Support system commissioning troubleshooting and post-test analysis through data review and model correlation
• Document analyses assumptions and results to support internal requirements customer needs and regulatory and licensing activities

Required Skills and Qualifications:

• B.S. in Electrical Engineering with an emphasis in power systems or control systems
• 5 years of experience performing power system analysis for generation microgrids or mission-critical power systems
• Experience with sizing and integrating high voltage battery systems with power electronics
• Strong experience with power system modeling and simulation tools (e.g. PSCAD ETAP PSSE Simulink or equivalent)
• Solid understanding of inverter-based resources rotating generation and power system control modes (grid-forming grid-following droop control)
• Experience analyzing system stability protection behavior and fault response in complex electrical systems
• Ability to clearly communicate technical concepts and results to cross-functional teams

Desired Skills and Qualifications:

• M.S. in Electrical Engineering or related discipline
• Experience with islanded or weak-grid power systems supporting critical loads
• Familiarity with interconnection requirements grid codes and relevant IEEE or utility standards
• Experience modeling dynamic loads and fast-changing electrical demand
• Exposure to nuclear aerospace defense or other highly regulated industries
• Experience mentoring junior engineers or leading technical efforts on complex programs

Additional Requirements:

• Must be willing to work extended hours and weekends as necessary to accomplish our mission
• Must work 100% onsite at Radiants El Segundo headquarters

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: .

Benefits and Perks for Eligible Employees:

• 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.
• Burgeoning satellite offices in Oak Ridge TN and Washington D.C. near Capitol Hill.

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.

Unfortunately we are unable to provide visa sponsorship at this time.

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.