Position Description

HPC Linux Administrator
Location TN - Oak Ridge
Job Code 4893
# of openings 1
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The National Center for Computational Sciences (NCCS) at Oak Ridge National Lab (ORNL), which hosts several of the world’s most powerful computer systems, is seeking highly qualified individuals to play a key role in improving the security, performance, and reliability of the NCCS computing environments.  

In this role, you will work within the HPC Clusters Group inside of the NCCS Systems Section to support numerous activities of the center.

The HPC Clusters Group administers and supports the division’s HPC computing infrastructure, which includes system installation, deployment, acceptance, performance testing, upgrades, problem diagnosis, and troubleshooting.
The Systems Section within National Center for Computational Sciences Division (NCCS).  The HPC Systems Section administers and supports the division’s computing, networking, and storage systems.
The NCCS provides state-of-the-art computational and data science infrastructure, coupled with dedicated technical and scientific professionals, to accelerate scientific discovery and engineering advances across a broad range of disciplines. NCCS hosts the Oak Ridge Leadership Computing Facility, one of DOE’s National User Facilities.


  • Work with the team to define and implement best practices and standards within the organization
  • Automate systems administration tasks utilizing open-source configuration management tools
  • Assist with designing, building, and maintaining HPC Linux systems
  • Tune operating systems and applications to increase performance and reliability of services
  • Diagnose system operational problems quickly and effectively
  • Document system administration procedures for routine and complex tasks
  • Participate in an on-call rotation providing 24-hour, 7-day support and off-hours maintenance windows
  • Coordinate with vendors to resolve hardware and software problems


  • Bachelor’s Degree in computer science or closely related field and a minimum of 5 years of experience in Linux/UNIX Systems Administration.
  • An equivalent combination of education and experience will be considered.
  • Familiarity or direct experience installing and utilizing SLURM.
  • Experience deploying and maintaining automated configuration management software (Puppet).


  • Excellent interpersonal/communication skills, and the ability to work as part of a team
  • Strong working knowledge of Unix system fundamentals and common network protocols.  Knowledge or experience working with Infiniband and parallel filesystems (Lustre, GPFS) is a plus.
  • Experience managing Linux/UNIX operating systems in a heterogeneous environment.
  • Solid understanding of networked computing environment concepts
  • Ability to develop and maintain programs and scripts that aid in the operation and automation of administrative tasks using various shell and scripting languages
  • Ability to identify requirements and to define, plan, and implement requisite solutions
  • Ability to plan organize, prioritize tasks, and complete assigned projects with minimal supervision
  • Experience with continuous integration and continuous deployment software methodologies and how they apply to systems engineering
  • An understanding of site reliability engineering fundamentals
  • Familiarity with code review processes / best practices and familiarity with tools like Git, GitHub and GitLab
  • Experience using tools such as Grafana and Nagios to monitor systems, metrics, and create dashboards
  • Experience designing and implement highly available systems/services
  • Experience participating in an open-source community with patches accepted upstream
  • Experience with developing systems tools, preferably using Python, Golang, Ruby, or BASH
  • Experience building custom packages for RHEL/Rocky using RPM
  • Familiarity or direct experience with various container strategies and orchestration tools such as Docker, PodMan, Singularity, OpenShift/Kubernetes
  • Familiarity or direct experience installing and utilizing job management and benchmarking tools such as STREAM/OSU, MPI benchmarks, IOR, etc.
  • Experience implementing systems level security technologies like SELinux and following security best-practices

We offer a comprehensive benefits package; salary depends on experience. To find out more about our company, please visit us at www.atlintl.com.

ATL is an Equal Employment Opportunity employer. It is our policy to make all employment decisions free from discrimination based on race, gender, religion, age, national or ethnic origin, disability, marital status, veteran status, or any other criteria protected by federal and state law. All matters relating to employment, including recruitment and selection, compensation, benefits, transfer, promotion, training, and education are decided purely based on qualification, experience, merit, ability, and performance of the candidate or employee. All interested parties are encouraged to apply for any of our job openings for which they meet the basic qualifications.

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