Engineering Manager, Hardware-in--Loop; HIL

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed.

1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028.

Radiant is seeking an Engineering Manager, HIL
, to lead the electrical engineering team responsible for test infrastructure and system integration for Kaleidos, Radiant's commercial microreactor unit targeted for deployment in 2028. You will manage a team of electrical engineers while owning cross-functional stakeholder relationships and driving execution from early architecture through hardware bring-up, testing, and commissioning. The ideal candidate brings deep electrical engineering expertise, proven people management experience, and a track record of delivering complex hardware programs on tight timelines.

Responsibilities & Duties

• Lead and grow a team of electrical engineers, owning hiring, performance management, and technical development.

• Own electrical and software integration requirements spanning power distribution, signal conditioning, sensor mapping, actuator interfaces, and device simulation.

• Manage schedule, budget, and vendor relationships for electrical hardware and integration activities.

• Drive electrical validation strategy; establish test procedures, methodologies, and best practices across the team.

• Own cross-functional alignment with embedded, controls, software, and mechanical engineering teams.

• Oversee test infrastructure build-out and establish the test environment as a foundational asset ahead of the 2028 deployment target.

• Lead design reviews and communicate technical decisions to cross-functional stakeholders and leadership.

Required Qualifications

• BS in Electrical Engineering, Mechanical Engineering, Computer Engineering or a related discipline.

• 8+ years of progressive engineering experience across hardware, controls, or test systems, with hands-on design, integration, and validation.

• 5+ years archictecting hardware-in-the-loop (HIL) systems, including signal conditioning, DAQ/IO interfaces, plant model integration, and embedded controls validation.

• 2+ years of engineering management experience, including hiring and team development.

• Demonstrated ability to drive programs with significant scope and ambiguity under tight timelines.

• Experience with DAQ and test systems (e.g., NI PXI, dSpace, Speedgoat, or similar).

• Proficiency with LabVIEW, Test Stand, and at least one scripting language (Python, C++, C#, or similar).

• Strong electrical, software, hardware debugging and root cause analysis skills.

Desired Qualifications

• MS or PhD in Electrical Engineering or a related discipline.

• 4+ years of engineering management experience, including hiring and team development.

• Familiarity with real-time simulation systems and/or FPGA-based hardware.

• Experience with controls fundamentals and software testing processes.

• Background in high-reliability, safety-critical, or regulated industry environments (aerospace, defense, nuclear, medical, or automotive).

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…