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.

Radiant is seeking a highly motivated Director, Nuclear Engineering to organize nuclear design and analysis strategy spanning the design, operation, and iteration of our microreactor fleet.

Responsibilities & Duties

Lead and grow a team of nuclear engineers spanning core physics, shielding performance, dose and consequence analysis, and nuclear instrumentation domains

Manage team execution to efficiently deliver against the strategy, remove roadblocks, and adapt to shifting priorities

Identify, manage, and effectively communicate technical, schedule, and regulatory risks

Develop and standardize analysis roadmaps to enable fast iteration across multiple reactor programs

Foster an attitude of ownership and mentorship within the team

Define the approach to nuclear engineering design margins and methodical peer reviews

Interact with universities, national labs, and other outside entities as necessary to accomplish key objectives

Required Qualifications & Skills

Hold a degree in nuclear engineering, physics, or engineering physics from an accredited institution

Minimum 10 years of experience managing a team in reactor design and analysis

Fluency in engineering first principles across nuclear, thermal, electrical, and mechanical domains

Excellence in communicating nuclear engineering concepts to a multidisciplinary audience

Familiarity with DOE authorization and/or NRC requirements and processes, and demonstrated experience with the development of nuclear facility safety bases

Must be willing to relocate to Radiant’s El Segundo office

Experience with Monte Carlo neutron transport codes, including OpenMC, Serpent, or MCNP

Desired Qualifications & Skills

Hands-on experience designing products, hardware, or tests

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.