Reactor Core Thermal Fluids Engineer

Thermal Fluids Engineer responsible for analyzing fluid flow and heat transfer in a reactor core, developing and validating methods for modeling coolant flow using one-dimensional, intermediate-fidelity, and high-fidelity CFD approaches. Responsibilities include modeling core thermal-hydraulic behavior with subchannel codes (DASSH, MOOSE-Subchannel, COBRA-TF) and one-dimensional systems codes (SAS4A/SASSYS-1, RELAP), applying first principles approaches and in-house flow-network models, performing 3-D CFD analyses, and documenting methods for steady-state and transient conditions. The role also covers automation, verification and validation of modeling tools, and cross-functional collaboration to define design requirements and provide feedback to design teams. Bonus qualifications include Python fluency and experience with CI/CD environments, reactor systems codes, subchannel analysis, and high-fidelity CFD. Travel to headquarters in Santa Clara, CA is required quarterly and onboarding requires in-person presence for the first two weeks; some travel to other sites may be necessary. Compensation ranges from $80,000 to $175,000. The posting emphasizes Oklo’s values and includes a recruitment fraud disclaimer.