HPC Linux Systems Engineer, Classified Environment

Oak Ridge National Laboratory; Oak Ridge (TN); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

Professional development opportunities

Access to diverse teams

Job summary

Oak Ridge National Laboratory is seeking candidates for a role in the National Security Computing team to design and manage HPC systems in a classified environment. Applicants should have at least 5 years of experience in Linux administration and be skilled in HPC architecture and cluster management.

This role requires close collaboration with security teams and a focus on delivering premier customer service while ensuring compliance with stringent security standards.

Qualifications

• Minimum of 5 years of experience in Linux systems administration.
• Experience with HPC clusters or large-scale Linux computing environments.
• Familiarity with identity management and multi-factor authentication systems.

Responsibilities

• Install, integrate, and administer Linux-based HPC clusters.
• Monitor and optimize system performance and reliability.
• Collaborate with scientists and researchers.

Skills

HPC architecture

Cluster management

Parallel computing

Linux systems administration

Scripting (Python, Bash)

Communication skills

Education

BS degree in computer science, engineering or related field

Tools

Ansible

Puppet

Bash

Python

SLURM/PBS/LSF

Lustre

InfiniBand

Job description

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.

Major Duties and 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.

Basic Qualifications

• 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.

Preferred Qualifications

• 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.

Special Requirement

• SCI Clearance: This position requires the ability to obtain and maintain a Secret Compartmented Information (SCI) clearance from the Department of Energy. As such, this position is a Workplace Substance Abuse (WSAP) testing designated position. WSAP positions require passing a pre‑placement drug test and participation in an ongoing random drug testing program. In addition, due to the SCI, you may also be subject to random polygraph testing.

About ORNL

As a U.S. Department of Energy (DOE) Office of Science national laboratory, ORNL has an impressive 80‑year legacy of addressing the nation’s most pressing challenges. Our team is made up of over 7,000 dedicated and innovative individuals! Our goal is to create an environment where a variety of perspectives and backgrounds are valued, ensuring ORNL is known as a top choice for employment. These principles are essential for supporting our broader mission to drive scientific breakthroughs and translate them into solutions for energy, environmental, and security challenges facing the nation.

Why Join Us

• Collaborate with diverse teams of scientists, engineers, and technologists from across the DOE complex and academia.
• Grow your career in a mission‑driven, innovation‑focused environment with 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.

This position will remain open for a minimum of 5 days after which it will close when a qualified candidate is identified and/or hired.

ORNL is an equal opportunity employer. All qualified applicants, including individuals with disabilities and protected veterans, are encouraged to apply. UT‑Battelle is an E‑Verify employer.