Radiant builds Kaleidos, a portable, factory-built nuclear microreactor that delivers a megawatt of clean power anywhere it is needed. Backed by a16z, Felicis and USV.
About the role
Radiant is seeking a Principal Thermal Modeling Engineer with deep expertise in CFD and thermal FEA to set the technical direction for thermal and fluid simulation of the Kaleidos microreactor. You will lead the most complex and consequential modeling problems for a high-temperature gas reactor, defining the methods, standards, and validation strategy that inform decisions across reactor systems, cooling systems, shielding, and more. Found on 1752vc Careers, the job board for startup and VC roles.
What they're looking for
- Bachelor’s degree in engineering, physics, or a similar field from an accredited institution, advanced degree (MS or PhD) preferred
- 10+ years of relevant industry experience, with a track record of technical leadership on complex, high-consequence programs
- Extensive experience with STAR-CCM+, Ansys Fluent, or other commercial CFD codes, including advanced turbulence and conjugate heat transfer modeling
- Mastery of finite element and computational fluid dynamics principles and methods, with demonstrated experience validating models against test data
- Proficiency with CAD software (Siemens NX)
- Experience building automated simulation workflows and scripting tools
More about this role
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 Principal Thermal Modeling Engineer with deep expertise in CFD and thermal FEA to set the technical direction for thermal and fluid simulation of the Kaleidos microreactor. You will lead the most complex...
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