Senior Mechanical Engineer, Nuclear Reactor Systems

Valar Atomics Inc.; Torrance (CA); On-site; USD 140,000 - 180,000; Full time

Benefits offered by this job

Equity ownership

Unlimited PTO

Free onsite meals (lunch & dinner)

PPE stipend

Autonomy & ownership

Job summary

Valar Atomics Inc. seeks a Senior Mechanical Engineer for the Numenor reactor program. This role will own mechanical subsystems from concept through build, test, and commissioning, including the reactor, control rods, helium pressure boundary, helium services, HVAC, and Citadel.

The position requires hands-on hardware focus, CAD proficiency, and strong analysis skills. You will collaborate with safety, IC&E, quality, and supply chain, mentor juniors, and help scale production for the first unit.

Qualifications

• Bachelor's degree in Mechanical Engineering or related field.
• 5+ years of mechanical engineering on complex hardware (pressure systems, heat transfer, mechanisms, large structures).
• Experience taking hardware from design through build and test.
• Proficiency in CAD and engineering drawing standards.
• Experience with ASME pressure vessel and piping codes (Section VIII, B31.3).
• Experience with high-temperature, high-pressure systems.
• Nuclear industry experience is a plus.

Responsibilities

• Own the mechanical design of assigned subsystems from requirements and concept through detailed design and design freeze.
• Perform and review stress, thermal, and fluid analyses (FEA and CFD).
• Develop 3D CAD models, assemblies, and drawings with GD&T and tolerance analysis.
• Plan and execute hardware through procurement specifications, vendor management, and factory build.
• Plan and execute component and integrated testing with the V&V team and support commissioning.
• Mentor junior engineers and contribute to design standards and configuration management.
• Lead root cause investigations and drive corrective actions on hardware issues.

Skills

5+ years exp

CAD proficiency

Stress analysis

Thermal design

Engineering drawings

Prototype to production

Nuclear systems

ASME codes knowledge

Education

Bachelor's degree in Mechanical Engineering

Tools

SolidWorks

Creo

NX

Job description

Valar Atomics Inc. seeks a Senior Mechanical Engineer for the Numenor reactor program. This role will own mechanical subsystems from concept through build, test, and commissioning, including the reactor, control rods, helium pressure boundary, helium services, HVAC, and Citadel.

The position requires hands-on hardware focus, CAD proficiency, and strong analysis skills. You will collaborate with safety, IC&E, quality, and supply chain, mentor juniors, and help scale production for the first unit.