HPC Linux Systems Engineer, Classified Environment

Oak Ridge National Laboratory • Oak Ridge, TN

4d • Onsite

About The Position

The Field Intelligence Operations Division invites candidates to apply to join our National Security Computing team to contribute to the design, implementation, and management of HPC systems within a classified environment. We are looking for candidates with experience in HPC architecture, cluster management, and parallel computing, with a proven ability to work within highly secure and regulated environments. This role involves close collaboration with security teams, scientists, and IT leadership to ensure that the HPC infrastructure meets the stringent performance, security, and compliance requirements necessary for classified work. As part of our team, you will be joining a vibrant group of professionals eager to provide premier customer service to ensure people and information technology remain secure. The team is collaborative and strives to ensure security practices and procedures are understood, implemented, and enforced. All team members deliver ORNL’s mission by aligning behaviors, priorities, and interactions with our core values of Impact, Integrity, Teamwork, Safety, and Service. This evergreen posting represents multiple openings for roles across ORNL’s high-performance computing classified ecosystem.

Requirements

• BS degree in computer science, engineering, or a related field.
• A minimum of 5 years of experience in Linux systems administration, or an equivalent combination of education and experience.
• Ability to obtain and maintain a Secret Compartmented Information (SCI) clearance from the Department of Energy.
• Must be able to pass a pre-placement drug test and participate in an ongoing random drug testing program.
• May be subject to random polygraph testing.

Nice To Haves

• Experience administering HPC clusters or large-scale Linux computing environments.
• Familiarity with batch schedulers (e.g., SLURM, PBS, LSF) and parallel file systems (Lustre, GPFS/Spectrum Scale).
• Experience implementing and managing automation and configuration management frameworks (Ansible, Puppet, Salt).
• Proficiency in scripting or programming (Python, Bash, Go).
• Understanding of networking fundamentals and high-speed interconnects (InfiniBand, Ethernet).
• Experience deploying or supporting identity management and multi-factor authentication systems (PingFederate, RSA SecureID, Entra ID).
• Familiarity with virtualization or containerization technologies (VMware, KVM, Podman, Apptainer).
• Experience troubleshooting and tuning high-performance storage, networking, and computer systems.
• Excellent communication, collaboration, and problem-solving skills.
• Demonstrated ability to lead or contribute to complex technical projects with minimal supervision.

Responsibilities

• Install, integrate, and administer Linux-based HPC clusters, storage systems, and high-speed networks.
• Monitor and optimize system performance, reliability, and scalability for large-scale computational workloads.
• Diagnose complex hardware and software issues, coordinating with vendors and internal engineering teams to implement solutions.
• Participate in system design, deployment, acceptance testing, and upgrades for leadership-class and research computing systems.
• Develop and maintain automation, configuration management, and monitoring solutions using tools such as Ansible, Puppet, Bash, or Python.
• Collaborate with scientists, researchers, and technical staff to ensure HPC resources effectively support scientific and mission objectives.
• Support identity management, authentication, and access control frameworks to maintain secure and compliant environments.
• Document system architectures, processes, and best practices, and contribute to internal knowledge sharing.
• Participate in on-call rotations and off-hours maintenance windows as required to support 24x7 operations.

Benefits

• Access to professional development and leadership opportunities.
• Enjoy life in East Tennessee, with a thriving research community, scenic outdoor recreation, and a high quality of life.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior