System Administrator III

Reflexive Concepts, LLC; Maryland; On-site; USD 110,000 - 170,000; Full time

Job summary

Reflexive Concepts, LLC is seeking a skilled System Administrator (Level 3) to join our growing team and support mission operations sustainment — monitoring, troubleshooting, and maintaining Linux-based high-performance computing systems on a high-impact national security mission.

Ideal candidates hold DoD 8570 IAT Level II certification, an active TS/SCI clearance with a full-scope polygraph (most recent poly within 7 years), and are prepared for an on-call duty.

Qualifications

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

• Monitoring, troubleshooting, and maintaining Linux-based high-performance computing systems on a high-impact national security mission.

Skills

Linux administration

Bash scripting

Troubleshooting

HPC architecture

Education

Bachelor's Degree or higher in a related technical field

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