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# Linux Systems Administrator (3rd shift)

- **Company:** 22nd Century Technologies, Inc.
- **Location:** Montgomery, United States
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Bash Shell, CentOS, CompTIA Security+, Computer Networks, Dynamic Host Configuration Protocol, Linux, File Systems, Domain Name System (DNS), Monitoring of Systems, Python (Programming Language), Linux System Administration, Routing, Performance Tuning, Red Hat Enterprise Linux, Ansible, TCP/IP, Oracle Linux, Software Vulnerability Management, Firewalls (Computer Science), SC Clearance, Patch Management
- **Published:** June 12, 2026
- **Apply:** https://www.clearancejobs.com/jobs/8973031/linux-systems-administrator-3rd-shift

## About the Role

Minimum 4 years of hands-on Linux Systems Administration experience
Active DoD Secret Security Clearance
Current CompTIA Security+ certification (IAT Level II compliant)
Experience administering enterprise Linux environments such as:
Red Hat Enterprise Linux (RHEL)
Rocky Linux
CentOS
Oracle Linux
Strong understanding of:
Linux operating systems and kernel fundamentals
User, group, and permission management
File systems, storage, and volume management
Networking concepts (TCP/IP, DNS, DHCP, routing, firewalls)
System monitoring and performance tuning
Experience with scripting and automation using:
Bash
Python
Ansible
Familiarity with STIG implementation and compliance requirements
Experience with patch management, vulnerability remediation, and system hardening
Ability to troubleshoot complex system and application issues

## Description

We are seeking an experienced Linux Systems Administrator to support mission-critical infrastructure and enterprise services for DISA. The ideal candidate will have a strong background in Linux administration, systems maintenance, troubleshooting, automation, security compliance, and enterprise operations within a DoD environment. This position requires an active Secret clearance and Security+ certification.


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