Engineering Manager, Hardware-in-the-Loop (HIL)

About Radiant

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.

About the Role

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, TestStand, 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.

Benefits and Perks

• 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.

• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees, to rapidly upscale into nuclear.

• 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. Radiant’s 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 today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [email protected].

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 applicant’s capacity to serve in compliance with U.S. export controls.