New Graduate Nuclear Engineer – Portable Microreactors

About the role

Radiant Industries is seeking a highly motivated new graduate nuclear engineer to support the design and analysis of its portable microreactor, Kaleidos. This onsite role in El Segundo offers hands‑on experience with cutting‑edge nuclear simulation tools and cross‑functional collaboration.

Key responsibilities

• Assist with nuclear design and analysis tasks, including shielding, neutronics, thermal, and fuel studies.
• Support coupled neutronics‑thermal calculations and develop rapid shielding design models.
• Document methods, results, and findings in technical reports and presentations.
• Perform criticality safety analysis for the production plant of Kaleidos reactors.

Required profile

• BS or MS in Mechanical Engineering, Nuclear Engineering, or related discipline.
• Graduating in December 2026 or Spring 2027.
• Strong academic foundation in reactor physics, thermal‑hydraulics, and radiation shielding.
• Proficiency in at least one programming language (Python, C++, C# or similar).

Required skills

• Python, C++, C#
• OpenMC, Serpent, MCNP, MOOSE, BISON, RELAP, CFD, Pronghorn, GRIFFIN

What we offer

• Substantial incentive stock plan for all full‑time employees.
• Comprehensive medical, vision, dental, and voluntary benefits.
• 8‑weeks paid parental leave and additional pregnancy leave for CA employees.
• Daily catered lunch, free snacks, flexible PTO, and remote workday allocation.