Oak Ridge National Laboratory

Requisition Id 16983 Overview: The Field Intelligence Operations Division (FIOD) of the National Security Directorate (NSSD) is seeking a Senior High Performance Computing (HPC) Engineer for Classified Computing, where you will help shape advanced computing capabilities supporting some of the nation's most important national security and scientific missions. In this role, you will lead the design, implementation, modernization, and operation of HPC environments built to solve complex computational challenges within highly secure classified environments. You will bring expertise in HPC architecture, cluster management, parallel computing, and performance optimization while helping evaluate and introduce emerging technologies that advance mission capabilities. You will work alongside a multidisciplinary team of HPC and systems engineers, cybersecurity professionals, scientists, researchers, and mission partners to develop computing solutions that deliver exceptional performance...

Requisition Id 17088 Overview: Oak Ridge National Laboratory (ORNL) is seeking a Group Leader for the Quantum HPC (QHPC) Group within the Science Engagement section in the National Center for Computational Sciences (NCCS). NCCS Provides state-of-the-art computational and data science infrastructure coupled with dedicated scientific and technical professionals tackling large-scale science and technology problems across a broad range of domains for accelerating scientific discovery and engineering advances. NCCS hosts the Oak Ridge Leadership Computing Facility (OLCF) which is a DOE National User Facility. OLCF operates Frontier, the nation's first exascale supercomputer. The QHPC group is part of a larger quantum science community at ORNL, focusing on the integration of quantum resources with classical HPC infrastructure. The research involves both the hardware and software integration of quantum devices into the NCCS ecosystem and science applications carried out on hybrid...

Requisition Id 16887 Overview: We are seeking a Postdoctoral Research Associate who will support the Ceramics and Ceramics Composites (CCC) Group within the Materials Science and Engineering Division (MSTD) at Oak Ridge National Laboratory (ORNL), and who will focus on ORNL's continued development of methods to quantify shear (yield) strength of monolithic ceramic materials as a function of temperature. You will use and help refine techniques developed at ORNL that estimate shear strength based on the brittle-to-ductile transition, hot hardness testing, spherical indentation, and other new pending methods. Additionally, you will develop/refine finite element and numerical analysis models to portray shear strength response as a function of temperature, and to attempt to ultimately reconcile those various experimentally measured responses. Major Duties/Responsibilities: Hot hardness testing and postmortem Spherical indentation and postmortem Estimate critical particle size...

Requisition Id 17132 Overview: Active DOE Q or active Top Secret clearance is required for consideration. The Field Intelligence Operations Division is seeking a highly skilled Senior SharePoint Developer and Administrator to lead the design, development, administration, and maintenance of an on-premises SharePoint Server environment in a classified, air-gapped setting. This role will support a licensed SharePoint deployment serving a broad user base and will be responsible for custom solution development, platform engineering, configuration, maintenance, troubleshooting, and continuous improvement of the environment. The ideal candidate has experience with SharePoint Server, enterprise portal administration, permissions and content management, workflow support and automation, and development of custom SharePoint components, scripts, and interfaces in secure environments. Candidates should be comfortable operating within strict security, compliance, and change management...

Requisition Id 17067 Overview: For this role, we are seeking an enthusiastic postdoctoral researcher to either refine or develop their expertise in composites manufacturing and characterization. As part of this role, the ideal candidate will be passionate about manifesting higher-level project deliverables into a timely, high-quality product. The immediate project needs for this candidate are in the development and optimization of products for a variety of industries from automotive to aerospace made from new bio- and waste-derived plastic resins and fillers. The ideal candidate for this role would be passionate about leveraging their experience or developing new expertise in composites manufacturing through a variety of methods from benchtop to pilot-scale. They should then be passionate about leveraging the one-of-a-kind characterization capabilities available across the laboratory to perform necessary characterization techniques to understand, optimize, and refine the...

Requisition Id 16549 Overview: We are hiring a HPC Software Engineer to design, operate and maintain clusters, servers, and workstations supporting services where science happens at ORNL! This position resides in the Emerging Technologies & Computing group in the Research Computing Division in the Information Technology Services Directorate at Oak Ridge National Laboratory (ORNL). The Emerging Technology Computational Group facilitates ORNL goals through HPC systems engineering, integration, and support for the research community at ORNL. By providing design, deployment, optimization, monitoring, and tooling support across multiple clustered infrastructures, we facilitate Lab-wide R&D projects. Our HPC clusters range in scope from just a handful of nodes to over fifty-thousand cores. We partner with ORNL research organizations to enable research excellence and delivery. We work with other clustered computing and HPC groups to help research programs identify the best...

Requisition Id 17087 Overview: Oak Ridge National Laboratory (ORNL) is seeking a Group Leader for the Workflow and Ecosystem Services (WES) Research and Development group in the National Center for Computational Sciences (NCCS). The group creates and deploys workflow, data, and AI-agent technologies that connect leadership-class computing with experimental and observational science. Its primary goal is to improve the efficiency, dependability, and trustworthiness of scientific workflows, from traditional HPC and data pipelines to agentic workflows in which AI agents plan, execute, monitor, and adapt computational and experimental campaigns, running in distributed large-scale advanced computing environments. The group also delivers AI-ready and FAIR scientific data, together with the orchestration, provenance, and benchmarking methods that make agentic and traditional workflows reliable at scale. The group's main objective is to empower scientists and researchers by enabling...

Requisition Id 17153 O verview: Oak Ridge National Laboratory (ORNL) is the largest US Department of Energy science and energy laboratory, conducting basic and applied research to deliver transformative solutions to compelling problems in energy and security. Our diverse capabilities span a broad range of scientific and engineering disciplines, enabling the laboratory to explore fundamental science challenges and conduct the research needed to accelerate the delivery of solutions to the marketplace. The Reactor and Nuclear Fuel Cycle Analysis Group (RNFCA) Group is seeking candidates to apply for the Advanced Nuclear Reactor and Fuel Cycle Engineer (Associate) role. This role is responsible for working with state-of-the-art modeling and simulation capabilities for lattice physics, reactor core, spent fuel, and fuel cycle applications through leadership in the development and analysis of SCALE and/or the Virtual Environment for Reactor Applications (VERA) simulations and in...

Requisition Id 17152 Overview: Oak Ridge National Laboratory (ORNL) is the largest US Department of Energy science and energy laboratory, conducting basic and applied research to deliver transformative solutions to compelling problems in energy and security. Our diverse capabilities span a broad range of scientific and engineering disciplines, enabling the laboratory to explore fundamental science challenges and conduct the research needed to accelerate the delivery of solutions to the marketplace. The Reactor and Nuclear Fuel Cycle Analysis Group (RNFCA) Group is seeking candidates to apply for the Advanced Nuclear Reactor and Fuel Cycle Engineer (Staff) role. This role is responsible for working with state-of-the-art modeling and simulation capabilities for lattice physics, reactor core, spent fuel, and fuel cycle applications through leadership in the development and analysis of SCALE and/or the Virtual Environment for Reactor Applications (VERA) simulations and in...

Requisition Id 17154 Overview: We are seeking a Materials Characterization Laboratory Technical Professional in the Applied Materials Analysis Group in the Materials Characterization Section, of the Nuclear Nonproliferation Division, part of the National Security Sciences Directorate Oak Ridge National Laboratory (ORNL). This role is responsible for managing the lab spaces through ensuring highly specialized equipment is maintained at maximum operability time, including coordination of vendor support and appropriate downtime to reduce impact to research. In addition, this role will manage the documentation and inventory system for the laboratory as well as be the key point of contact for all day to day operations within the lab space. This role also has the availability to support R&D activities as this role will become a SME in the functionality of several specialized instruments. It will become expected that as this role develops, the candidate will begin...

Requisition Id 16802 Overview: We are seeking a Postdoctoral Research Associate for the development and application of advanced multiphysics simulations, and machine learning (ML) methods relevant to additive manufacturing (AM), virtual manufacturing, material characterization, topology optimization, and real-time sensing. This position resides in the Computational Sciences and Engineering Division (CSED) at Oak Ridge National Laboratory (ORNL). CSED focuses on transdisciplinary computational science and analytics at scale to enable scientific discovery across the physical sciences, engineered systems, and biomedicine and health. It provides foundations and advances in quantum information sciences to enable quantum computers, devices, and networked systems. It develops community applications, data assets, and technologies and provides assurance to build knowledge and impact in novel, crosscut-science outcomes. The candidate will be a postdoctoral researcher within the...

Requisition Id 16764 Overview: The National Center for Computational Sciences (NCCS) at the Oak Ridge National Laboratory (ORNL) is seeking a postdoctoral research associate in the area of Application-driven Composable Distributed Storage. The candidate will be able to make research contributions in understanding and efficient use of distributed data storage and I/O subsystems for High-Performance Computing (HPC), scientific Artificial Intelligence (AI), and scientific edge computing. We are a leader in computational and computer science, with signature strengths in high-performance computing and data analytics with applications in a large variety of science domains. NCCS is home to some of the fastest supercomputers and storage systems in the world. This position is in the Technology Integration group within NCCS. Specific areas of research interest include: Flexible, composable storage service architectures that expose useful data container abstractions and interfaces...

Requisition Id 16907 Overview: The Advanced Engineering Technologies (AET) Group is seeking a Computational Fluid Dynamics Analyst specializing in the use and development of computational simulation software for complex aerodynamic systems in the support of the nonproliferation mission space. This position will involve the creation and use of custom developed and off-the-shelf computational approaches in a research and development atmosphere. Major Duties / Responsibilities: You will, in collaboration with principal investigators and project management at ORNL, participate in the development of simulation software to model complex system flows in processes relevant to the nuclear nonproliferation mission space. You will be expected to be a heavy end user of the tools generated, participate in model validation activities, identify workflow improvements, and communicate issues to the development team for tool Analysis of ad hoc problem sets relevant to the nuclear...

Requisition Id 17143 Overview: We are seeking a Project Manager who will focus on programmatic and portfolio management in the Cyber Resilience and Intelligence Division (CRID), of the National Security Sciences Directorate (NSSD) at Oak Ridge National Laboratory (ORNL). Successful candidates will work across our research portfolio working with our sponsors, staff and laboratory leadership. This role balances scientific and engineering talent with R&D needs, shepherd's proposals, monitors and provides financial updates, ensures completion of milestones, identifies emerging mission needs, shapes new program opportunities, and cultivates sponsor relationships across the defense, homeland security, and intelligence communities. This position will play a critical role in guiding program growth, aligning research capabilities with sponsor priorities, and building partnerships that advance CRID's technical and mission impact. Successful candidates will work across our research...

Requisition Id 17064 Overview: We are seeking a Nuclear Materials and Supplier Integrator for our Nuclear Materials and Procurement Group (NM&P) within the Research Reactors Division (RRD). In this group, we have the responsibility of assuring the availability of certified spare parts and materials needed to maintain and operate the High Flux Isotope Reactor (HFIR) and Cold Neutron Source plant systems at Oak Ridge National Laboratory (ORNL). The HFIR is a Category 1 nuclear facility and requires a high degree of rigor be applied to HFIR nuclear procurement processes. We are seeking a nuclear procurement professional who will provide procurement leadership and support in a variety of standard and specialized procurement activities through application of innovative and creative techniques! You will play a vital part in the entire supply chain process for the HFIR, including reactor materials procurement, commercial grade dedication, materials management, and so much more!...

Requisition Id 17150 Overview : We are seeking a Senior Nuclear Operations Strategist for Business Management Services (BMS) in the Research Reactors Division (RRD) of Neutron Sciences Directorate (NScD). The mission of BMS is to provide excellent, efficient, and compliant nuclear grade services to support safe and reliable High Flux Isotope Reactor (HFIR) operations. The BMS Section is responsible for Reactor Certification and Qualification, Nuclear Materials and Procurement, Information Technology (IT) implementation, Document Control and Records management, financial planning, and budget management. The Senior Nuclear Operations Strategist works closely with the BMS Section Head to lead a variety of division-wide activities, ensuring operational excellence, strategic alignment, and organizational effectiveness within the section and the division. Major Duties/Responsibilities: Collaborate with RRD leadership in developing and executing divisional management and nuclear...

Requisition Id 17151 Overview: Oak Ridge National Laboratory (ORNL) is the largest US Department of Energy science and energy laboratory, conducting basic and applied research to deliver transformative solutions to compelling problems in energy and security. Our diverse capabilities span a broad range of scientific and engineering disciplines, enabling the laboratory to explore fundamental science challenges and conduct the research needed to accelerate the delivery of solutions to the marketplace. The Reactor and Nuclear Fuel Cycle Analysis Group (RNFCA) Group is seeking candidates to apply for the Postdoctoral Research Associate, Advanced Nuclear Reactor and Fuel Cycle Engineer role. This role is responsible for working with state-of-the-art modeling and simulation capabilities for lattice physics, reactor core, spent fuel, and fuel cycle applications through leadership in the development and analysis of SCALE and/or the Virtual Environment for Reactor Applications (VERA)...

Requisition Id 16816 Overview: The Geospatial Science and Human Security Division (GSHSD) is currently seeking world-class research and development professionals for the National Security Sciences Directorate within Oak Ridge National Lab. The geospatial data engineer will support the development of next generation data strategies that will support and deploy operational situational awareness products for sponsors across the Federal Government. We're looking for staff who bring fresh ideas from areas including information retrieval, distributed computing and storage, and data processing workflows. We need our staff to be flexible and be enthusiastic to take on problems across the organization as we continue to solve complex global scale problems in the areas associated with spatial computing. The Geospatial Data Engineer will focus on the implementation of scalable data storage and processing solutions for high-volume and high-velocity data applications. The proposed...

Requisition Id 17149 Overview: We are seeking a Postdoctoral Research Associate who will focus on using optical fibers for measuring property evolution, dimensional changes, and corrosion in harsh, high temperature, nuclear environments. This position resides in the Nuclear and Extreme Environment Measurement (NEEM) Group in the Nuclear Energy and Fuel Cycle Division, Fusion and Fission Energy and Science Directorate at Oak Ridge National Laboratory (ORNL). The NEEM Group focuses on pushing the limitations of materials, sensors, and experiments through technology development, advanced instrumentation, irradiation experiments, and rapid design/fabrication. As part of the research team, you will investigate optical fiber instrumentation. More specifically, this position would develop Fabry-Perot interferometer-based sensors to measure thermal and irradiation creep in advanced nuclear materials, as well as measuring the corrosion and oxidation of zirconium in light water reactor...

Requisition Id 16693 Overview: We are seeking a Cooling Systems Engineer to provide technical engineering oversight of cooling systems supporting the Spallation Neutron Source (SNS) and High Flux Isotope Reactor (HFIR). This position resides in the Cooling Systems Group in the Site Services Group, Research Accelerator Division, Neutron Sciences Directorate at Oak Ridge National Laboratory (ORNL). Major Duties/Responsibilities: Provide systems-level engineering support on piping specification, material selection, heat exchanger thermal sizing, and pump selection, translating decisions into clear direction for designers and technicians. Perform hydraulic and CFD analysis to evaluate system performance, support design changes, and guide equipment selection. Evaluate operational data from facility monitoring software to identify performance trends and recommend improvements. Review cooling system components - piping, pumps, water treatment - and provide engineering support...