# Principal Thermal Modeling Engineer at Radiant

- Company: Radiant
- What the company does: 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.
- Company website: https://www.radiantnuclear.com
- Type: Startups
- Level: Principal and up
- Location: El Segundo, CA
- Work setup: On-site
- Pay: $182K to $293K base salary per year (USD)
- Posted: 2026-11-05
- Apply by: 2026-12-20
- Apply: https://jobs.ashbyhq.com/radiant-industries/9bd3659b-315f-48dc-aba0-3086181526be?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/radiant-principal-thermal-modeling-engineer/

## 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

Tags: Engineering

Source: 1752vc Careers, https://www.1752.vc/careers/jobs/radiant-principal-thermal-modeling-engineer/