Senior Manager, Power Systems

About Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. Rising energy demand is straining the U.S. grid and driving up utility costs, emissions, and interconnection backlogs. Radiant decentralizes energy, producing power close to where it’s used. Its first reactor, Kaleidos, is a factory-built, 1-megawatt, fail-safe microreactor that can be transported by land, sea, or air and runs up to 5 years without refueling.

Deployed locally without a decade-long build or permitting fight, Kaleidos provides independent power for critical infrastructure like military bases, data centers, hospitals, and remote sites. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Air Force, Navy, and has pre-order agreements with Equinix, with deployments beginning in 2028.About the Role 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  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 Earth's first mass-produced portable nuclear reactors, and to extending that capability beyond Earth.

Responsibilities & Duties 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.

Required Qualifications & Skills 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, switch gear, 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…