This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description Thermal-Hydraulics Engineers at Oklo are responsible for analyzing fluid flow and heat transfer within a reactor and associated systems. This work includes engineering analyses of thermal-fluid dynamics, clear and thorough documentation of the analyses, as well as interfacing with design teams. A Core Thermal-Hydraulics Methods Engineer will contribute to the development, qualification, and validation of methods for modeling coolant flow within reactor cores using one-dimensional models and intermediate-fidelity subchannel models. - Modeling core thermal-hydraulic behavior using: - Subchannel codes such as DASSH, or MOOSE-Subchannel - One-dimensional systems codes such as SAS4A/SASSYS-1 or SAM - First principles approaches and in-house flow network models - Developing methods to analyze core thermal-hydraulic behavior at steady-state and during transients - Developing and utilizing analysis methods that efficiently and effectively build confidence in a design - Automation, verification, and validation of modeling and simulation tools in support of analyses - Collaborating cross-functionally to define design requirements, and providing technical feedback to quick-iterating design teams - Document work using modern tools and techniques, and write well-written, thoughtful technical reports Qualifications - Bachelors, Masters, or PhD in a technical field, such as nuclear, mechanical, or aerospace engineering - Proficiency with thermal-hydraulics (thermal fluids) analysis methods - Core competencies in heat transfer, fluid dynamics, and thermodynamics first principles - Experience with low-fidelity and intermediate-fidelity (e.g., porous body and correlation-based) models for heat transfer and fluid flow - Experience with numerical methods and software development for heat transfer and fluid flow problems - Experience with data processing (e.g., pre-processing, post-processing, scripting) Requirements - Fluency with Python - Experience with CI/CD computing environments - Experience with reactor systems codes, such as SAS4A/SASSYS-1, SAM, RELAP, TRACE, or GOTHIC - Experience with qualification and validation of analyses - Experience with subchannel analysis codes, such as DASSH, MOOSE-Subchannel, COBRA-TF, or similar - Experience with high-fidelity computational fluid dynamics analysis Benefits - Salary: $73,000-$157,000 - Flexible time off - Equity - Competitive pay - 401k - Health insurance - FSA - Flexible work hours - Other benefits Company Description Oklo Inc. is developing fast fission power plants to deliver clean, reliable, and affordable energy at scale; establishing a domestic supply chain for critical radioisotopes; and advancing nuclear fuel recycling to convert nuclear waste into clean energy. Oklo was the first to receive a site use permit from the U.S. Department of Energy for a commercial advanced fission plant, was awarded fuel material from Idaho National Laboratory, and submitted the first custom combined license application for an advanced reactor to the U.S. Nuclear Regulatory Commission. Oklo is also developing advanced fuel recycling technologies in collaboration with the U.S. Department of Energy and U.S. National Laboratories.

• Project Engineering & Consulting (50%): Serve as a team member on customer projects, focusing on design, architecture, integration, implementation, and documentation. This includes research, benchmarking, performance and functional testing, reference architectures, sizing, migration, integration, development, and tooling. • Consultative Support (50%): Provide case-initiated consultative support to strategic users, customers, and prospects, assisting with implementation, onboarding, production launches, and Proof of Concepts (POCs). • Provide architectural, technical, and migration assistance, including hands-on tasks. • Work as a member of the Support Team, handling L1 to L3 cases and communications when not actively assigned to customer projects. • Partner closely with ClickHouse Product Management, Engineering, and Sales to contribute to the product roadmap and account plans. • Develop and assist with a wide range of content, including Public and Internal Documentation, Knowledge Base articles, ClickHouse Learning, Reference Architecture, blogs, and benchmark results. • Assist with hiring and mentoring new team members as we grow and scale. • Be available for scheduling and on-call needs to deliver high-quality 24x7 support in a global, distributed environment, including up to 35% estimated onsite regional travel.

• Support a federal agency’s technical division and act as a subject matter expert for technical matters associated with the agency’s real property portfolio that includes facilities and supporting infrastructure. • Utilize subject matter expertise to deliver solutions to engineering requirements for DHS projects to include both new construction and maintenance and repair of existing real property. • Communicate with senior leadership; engineering subject matter experts (SMEs), project managers and facility managers about issues and solutions regarding project requirements. • Perform quality assurance reviews of design documents and engineering studies and provide associated technical recommendations. • Review project progress from an engineering perspective, measuring performance and proposing necessary corrective actions to maintain agreed-upon requirements. • Travel to project sites at geographically dispersed locations nationwide as required to verify progress of work, ensure conformity with specifications and accepted engineering practices, attend program management reviews and contribute to technical Integrated Project Teams • Provide engineering inputs to cost estimates; utilize value engineering analysis as needed. • Assist with all aspects of facility development, including planning, programming, design and construction phases. • Provide input on appropriate standards, and guidelines, as well as interpretation and compliance for building code and regulations. • Collaborate with other personnel including other architects, engineers, project managers, facility managers, planning and budget staff. • Oversee the implementation and execution of engineering projects as needed. • Work with service providers including the U.S. Army Corps of Engineers (USACE), the U.S. General Services Administration (GSA), and other outside contractors to ensure acceptable delivery of project services.

• Lead & deliver: Set technical direction, break down roadmaps, and lead engineers through design, implementation, and rollout of DevEx initiatives. • Own CI/CD: Standardize build/test/release workflows using Jenkins and GitHub (Actions/Apps), with reusable pipelines, shared libraries, and policy gates. • Run GitOps at scale: Operate and evolve Flux-based GitOps for environment promotion, rollback, and drift detection across multiple clusters. • Package & deploy: Define and maintain Helm chart standards, release processes, and documentation for service teams. • Kubernetes platform: Design guardrails, multi-tenant patterns, and golden templates on EKS (and support for GKE/Rancher/other distros where applicable). • Hybrid environments: Build consistent developer workflows spanning AWS and on-premdatacenters/virtualization platforms; ensure connectivity, secrets, and artifact flows work end-to-end. • Observability & reliability: Establish SLOs for platform services; integrate logs/metrics/traces, progressive delivery, and automated rollback. • Security & compliance: Embed security scanning, SBOMs, and policy-as-code into pipelines and cluster admission. • Enablement: Produce high-quality docs, examples, CLI/templates, and run office hours to uplevel teams. • Stakeholder management: Partner with Security, SRE, and product teams; communicate trade-offs and progress to engineering leadership. • Embrace and champion the thoughtful adoption of AI to improve team performance and business outcomes. • Leverage AI tools (e.g., generative AI, automation platforms, data copilots) to improve productivity, decision-making, and output quality in your day-to-day work.