System Administrator III

Reflexive Concepts, LLC; Georgetown (MD); On-site; USD 110,000 - 170,000; Full time

Job summary

Reflexive Concepts, LLC is seeking a System Administrator (Level 3) to monitor, troubleshoot, and maintain Linux-based HPC systems supporting a national security mission. The role requires 10+ years of sysadmin experience, TS/SCI with full-scope polygraph, and DoD 8570 IAT II certification.

You will work on on-call rotations, manage OS installs, networking, and software builds across diverse Linux distributions, leveraging tools like Jira, Confluence, Grafana, and Ansible to sustain critical

Qualifications

• Ten (10) years of system administration experience.
• Bachelor's Degree or higher in a related technical field.
• An additional five (5) years of system administration experience may be substituted for the degree, for a total of Fifteen (15) years.
• Linux administration on RHEL, CentOS, Rocky, SLES, or Ubuntu.
• OS install, file system configuration, and TCP/IP networking.
• Operating system and application troubleshooting.
• BASH scripting; software compilation and install.
• DoD 8570 IAT Level II certification (with verification code).
• Active TS/SCI clearance with full-scope polygraph (most recent poly within 7 years).
• This position carries an on-call requirement.

Responsibilities

• Monitor, troubleshoot, and maintain Linux-based HPC systems.
• Support mission operations sustainment for a high-impact national security mission.
• Participate in on-call rotations and incident response.

Skills

Linux administration

Networking

Troubleshooting

BASH scripting

Security clearance

On-call readiness

Education

Bachelor's degree or higher

Tools

Jira

Confluence

Grafana

Prometheus

Nagios

Slurm

Git

Salt

Ansible

Job description

Reflexive Concepts is seeking a skilled System Administrator (Level 3) to join our growing team!

Reflexive Concepts is seeking a skilled System Administrator to support mission operations sustainment — monitoring, troubleshooting, and maintaining Linux-based high-performance computing systems on a high-impact national security mission.

Qualifications

• Ten (10) years of system administration experience


• Bachelor's Degree or higher in a related technical field
  
  
  
  • An additional five (5) years of system administration experience may be substituted for the degree, for a total of Fifteen (15) years
  
  
  
  

Required

• Linux administration on RHEL, CentOS, Rocky, SLES, or Ubuntu


• OS install, file system configuration, and TCP/IP networking


• Operating system and application troubleshooting


• BASH scripting; software compilation and install


• DoD 8570 IAT Level II certification (with verification code)


• Active TS/SCI clearance with full-scope polygraph (most recent poly within 7 years)


• This position carries an on-call requirement.

Desired Skills

• Understanding of HPC architecture and high-speed networks (InfiniBand, Slingshot)


• Familiarity with Jira, Confluence, Grafana, Prometheus, Nagios, Slurm, git, Salt, and Ansible


• Strong troubleshooting skills — comfort with the reality that no two systems are exactly alike