Harness Design Engineer

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 a Harness Design Engineer to support the design, build, and integration of electrical wire harnesses in a fast-paced startup environment. You’ll work alongside experienced mechanical and electrical engineers to solve challenging problems in system architecture, sensor/actuator selection, packaging, and system integration for advanced hardware. This role offers hands-on exposure to end-to-end hardware development from CAD and analysis through build, test, and validation.

Responsibilities & Duties:

• Own the design of the harnessing system from concept to integration, and serve as the subject matter expert on the interconnection between electrical and hardware systems.

• Create harness drawings for manufacturing and act as the primary point of contact for the harness manufacturing team.

• Support the creation of the reactor electrical schematics using Zuken E3 Cable and maintain the pinout tables throughout the design cycle.

• Make decisions about conductor sizing, wire type, and shielding methods for low and high voltage using industry standards for guidance.

• Use an understanding of electrical failure mechanisms, including voltage drop, thermal effects, and interference, to identify and mitigate risks.

• Select materials, with support from the materials team, for harnessing in challenging environments across the reactor.

• Support technicians with harness integration on the reactor as the system owner.

• Work with the electrical team to commission the system and troubleshoot issues across the reactor.

• Provide nonconformance solutions throughout the build and integration phases of development to limit program delays and maximize system uptime.

Required Qualifications & Skills:

• Bachelor’s degree in Electrical Engineering, Mechanical Engineering, or a closely related field from an accredited institution.

• 3+ Years of professional hands-on harness design or manufacturing experience.

• Strong understanding of harnessing architecture, grounding schemas, power requirements, and shielding.

• Strong understanding of electrical systems and the ability to interpret schematics.

• Proficiency with analog instrumentation including 4-20mA sensors, accelerometers, resolvers, RTDs, and thermocouples.

• Experience with Zuken E3 Cable, EPLAN, or similar harness design and schematic capture tools.

• Proficiency with inductive devices such as solenoid valves.

• Familiarity with Siemens NX or similar 3D CAD tools.

• Basic understanding of high-voltage systems up to 1000 volts.

Desired Qualifications & Skills:

• 5+ Years of professional hands-on harness design or manufacturing experience.

• Harness design for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial), including radiation, thermal cycling, or vibration exposure.

• Familiarity with industry harnessing standards such as IPC/WHMA-A-620, SAE AS50881, or NEC/NFPA requirements.

• Hands-on experience supporting harness build and integration on the floor, including troubleshooting and nonconformance resolution during commissioning.

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 full-time 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.