Thermal Engineer for Nuclear Microreactor Systems

Socket.dev; El Segundo (CA); On-site; USD 100,000 - 140,000; Full time

Benefits offered by this job

Stock options

Medical coverage

One Medical membership

Vision plan

Dental plan

Parental leave

Catered lunch

Flexible PTO

Remote work option

Team events

Oceanfront HQ

Job summary

Radiant in El Segundo, CA is seeking a highly motivated Thermal Engineer to join the team. You will develop and execute thermal analysis and CFD to evaluate Kaleidos system performance and document results for clear, actionable outputs.

You will expand CFD capabilities, own the workflow from CAD geometry to analysis outputs, and develop methods to validate lower‑fidelity thermal analyses. This role suits someone graduating in 2026/2027 who thrives in a fast‑paced startup focused on deploying

Qualifications

• BS or MS in Chemical Engineering, Mechanical Engineering, Aerospace Engineering, or related discipline.
• Graduating in December 2026 or Spring 2027.
• A high level of independence in solving challenging engineering tasks is preferred.
• Ability to seek out resources and proactively ask questions to finish projects through completion effectively, accurately, and timely.
• Genuinely excited for our mission to rapidly deploy nuclear microreactors to remote locations requiring abundant, clean energy.
• Knowledge of reactor physics will provide useful context but is not necessary.
• Prior internship experience helpful but not required.

Responsibilities

• Develop and execute thermal analysis and CFD to evaluate design and performance of Kaleidos systems.
• Document analysis results to communicate clear and actionable outputs.
• Expand CFD capabilities, accuracy, and efficiencies via methods and workflow development projects.
• Own pipeline for producing analysis geometry from mechanical design CAD
• Develop methods and calculations to support and build confidence in lower-fidelity thermal analysis methods.

Skills

Thermal analysis

CFD

Independent problem solving

Startup experience

Communication

Education

BS in Chemical Eng

MS in Mechanical Eng

Tools

ANSYS Fluent

CAD software

Job description

Radiant in El Segundo, CA is seeking a highly motivated Thermal Engineer to join the team. You will develop and execute thermal analysis and CFD to evaluate Kaleidos system performance and document results for clear, actionable outputs.

You will expand CFD capabilities, own the workflow from CAD geometry to analysis outputs, and develop methods to validate lower‑fidelity thermal analyses. This role suits someone graduating in 2026/2027 who thrives in a fast‑paced startup focused on deploying