Senior Mechanical Engineer, Fluid Systems (Nuclear)

Radiant, based in El Segundo, CA, seeks a Senior Mechanical Engineer to own critical Kaleidos fluid systems from design through build and production. You will lead trade studies, component selection, thermal hydraulic analysis, piping design, vendor selection, assembly, and testing.

You will drive subsystem risk analyses, BOM management, supplier development, and cross-functional collaboration to deliver the first new commercial reactor design in decades by 2026.