Senior Thermal Engineer (Nuclear)

TL;DR

Senior Thermal Engineer (CFD/Nuclear): Designing and implementing high-fidelity thermal CFD and FEA simulations for portable nuclear microreactor systems with an accent on turbulent flow, heat transfer, and multiphysics modeling. Focus on building automated simulation workflows, improving analysis accuracy, and solving complex thermal challenges across reactor, cooling, and shielding systems.

Location: 100% onsite at the El Segundo, California headquarters; extended hours and weekends may be required. The position involves access to technology subject to U.S. export controls.

Salary: $139,500–$224,700 annually, plus equity.

Company

hirify.global is a startup developing mass-produced, portable nuclear microreactors for hospitals, data centers, remote sites, and military bases.

What you will do

• Own and execute thermal CFD analyses for reactor systems and performance evaluation.
• Develop models for turbulent flow, heat transfer, and multiphysics interactions.
• Define and implement CFD simulation best practices.
• Build automated workflows that improve simulation capabilities, accuracy, and efficiency.
• Collaborate with interdisciplinary teams on reduced-order analysis methods and design decisions.

Requirements

• Bachelor’s degree in engineering, physics, or a related field from an accredited institution.
• 5+ years of relevant industry experience.
• 5+ years of experience with STAR-CCM+, Ansys Fluent, or another commercial CFD code.
• Proficiency with CAD software, particularly Siemens NX.
• Mastery of finite element and computational fluid dynamics modeling principles and methods.
• Experience communicating and distilling technical information for cross-functional teams.

Nice to have

• Experience with radiation heat transport modeling.
• Knowledge of nuclear reactor design.
• Strong ownership, self-motivation, and an end-to-end approach to work.

Culture & Benefits

• Substantial incentive stock plan for full-time employees.
• Comprehensive medical, dental, and vision coverage, with dependent coverage options.
• Eight weeks of paid parental leave for all parents, plus additional paid pregnancy leave for California employees.
• Flexible PTO, catered lunches, snacks, drinks, and commuter and FSA/HSA options.
• Company and team-bonding events in an in-person work environment.