Computational Fluid Dynamics Thermal-Hydraulics Engineer

Computational Fluid Dynamics Thermal-Hydraulics Engineer

Thanks for your interest in Oklo! We are searching for a CFD Thermal‑Hydraulics Engineer to join our team.

The role involves analyzing fluid flow and heat transfer within a reactor and associated systems, performing high‑fidelity thermal‑fluid simulations using commercial CFD tools, documenting analyses, and interfacing with design teams.

• Develop high‑fidelity CFD analyses of thermal‑hydraulic behavior in reactor core, vessel, heat exchangers, power conversion, and balance of plant systems.
• Proactively design, model, and analyze thermal‑hydraulic systems; develop and use efficient analysis methods building confidence in designs.
• Perform engineering analyses across thermal, fluid, safety, manufacturability, and cost domains.
• Collaborate cross‑functionally to define design requirements and provide technical feedback to rapid‑iterating design teams.
• Document work with modern tools and produce clear, thoughtful technical reports.

• Bachelor’s, Master’s, or PhD in nuclear, mechanical, or aerospace engineering.
• Proficiency with STAR‑CCM+, ANSYS Fluent, OpenFOAM, Nek‑5000, or equivalent.
• Strong foundation in heat transfer, fluid dynamics, and thermodynamics principles.
• Experience with data processing (pre‑processing, post‑processing, scripting).

• Thermal‑hydraulic engineering and multi‑physics analysis for power systems.
• Nuclear engineering principles and multi‑physics analysis for advanced reactors.
• Heat‑exchanger, turbo machinery, and fluid‑control system analysis.
• Modern software engineering practices and programming language proficiency.
• Fluency in Python.
• Reactor transient analysis experience.
• Experience with safety codes (GOTHIC, RELAP, TRACE, SAM, SAS4A/SASSYS‑1).

• Passionate about clean energy and advanced fission.
• Quick learner and self‑motivated.
• Team‑player with strong communication skills.
• Comfortable in fast‑paced, iterative environments.
• Creative problem‑solver, critical thinker.
• Excellent written and verbal technical communication.

You are a startup person who drives efficiency, thrives without excessive hierarchy, and enjoys fast‑paced collaboration. You are self‑motivated, a strong communicator, a creative thinker, and detail‑oriented.

Remote employees may need to travel to headquarters in Santa Clara, CA, twice a quarter for meetings, off‑sites, and other company events.

Salary: $73,000 – $157,000 base, plus performance incentives and equity. Benefits include flexible time off, 401k, health insurance, FSA, and other perks.

Oklo Inc. develops fast‑fission power plants at scale, builds a domestic critical isotope supply chain, and advances nuclear fuel recycling. The company holds a DOE site‑use permit and is collaborating with DOE and National Laboratories.

• Collaboration
  :
  We go further together, sharing ownership and building trust via transparency and respect.
• Humility
  :
  We act for the company and world, focused on mission over personal recognition.
• Ownership
  :
  We take pride in delivery, proactively solving problems.
• Pathfinding
  :
  We chart new ground with curiosity, courage and creativity.

Oklo is aware of recent recruitment fraud attempts. Legitimate communications come exclusively from an official Oklo email. Oklo will never ask for sensitive personal information, payments, or account credentials during hiring.