Senior Red Hat Linux Systems Admin — TS Clearance & On-Call

The One 23 Group; Montgomery (AL); On-site; USD 90,000 - 130,000; Full time

Job summary

The One 23 Group is seeking a Senior Linux Systems Administrator to provide Tier II/III administration for Red Hat Enterprise Linux and UNIX servers, primarily at the Pentagon. The role supports GCCS-J and JPES mission environments, requiring active Top Secret clearance and SIPRNet eligibility.

A 24/7 on-call rotation and COOP readiness are part of the job. Responsibilities include server administration, patching, security compliance, backup coordination, and documentation.

Qualifications

• Active Top Secret clearance or higher is required.
• Experience: 10+ years in IT with complex systems and operational environments.
• Advanced UNIX/Linux administration experience, preferably RHEL.
• DoD IAT Level II certification requirements and related security credentials.
• Ability to work independently and in on-call rotations.

Responsibilities

• Administer and maintain RHEL and UNIX servers across production, test, and development environments.
• Perform account administration, OS maintenance, monitoring, and troubleshooting.
• Engineer and sustain Linux server hardware, OS, and supporting software for critical environments.
• Patch management, change control, and vulnerability remediation per DISA STIGs.
• Support backup, recovery, DR, and COOP activities; document incidents and runbooks.
• Coordinate with government leads, admin teams, cybersecurity, and external support.

Skills

Unix/Linux administration

System administration

24/7 on-call support

Security compliance

Education

DoD IAT Level II certifications

U.S. Citizenship

Tools

Red Hat Enterprise Linux (RHEL)

UNIX servers

VMware virtualization

Job description

The One 23 Group is seeking a Senior Linux Systems Administrator to provide Tier II/III administration for Red Hat Enterprise Linux and UNIX servers, primarily at the Pentagon. The role supports GCCS-J and JPES mission environments, requiring active Top Secret clearance and SIPRNet eligibility.

A 24/7 on-call rotation and COOP readiness are part of the job. Responsibilities include server administration, patching, security compliance, backup coordination, and documentation.