Senior Power Systems Engineer

Overview

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s 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.

Radiant’s 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.

Senior Power Systems Engineer — 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. You’ll collaborate closely with electrical design, controls, turbo machinery, 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 Earth’s first mass-produced portable nuclear reactors.

• 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

• 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, PSS E, 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

• 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