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# Linux System Administrator, Level 3

- **Company:** Independent Software
- **Location:** Annapolis Junction, MD, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Proxmox, Microsoft Windows, Application Firewall, JIRA, User Authentication, Bash Shell, Computer Networks, Linux, DevOps, Domain Name System (DNS), Perl (Programming Language), Monitoring of Systems, Internet Protocol, Python (Programming Language), Kernel-Based Virtual Machine, Linux System Administration, Windows Servers, NetBackup, NetApp Applications, Red Hat Enterprise Linux, Ansible, Virtualization Technology, Scripting, Data Storage Management, Cloud Platform System, Hyperconverged Infrastructure, Backend, Nutanix, Firewall Services Module, Cisco, Vmware
- **Published:** October 28, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9268374/linux-system-administrator-level-3

## About the Role

* Linux system administration experience appropriate to the position level.
 * Solid experience with STE/STN environments and DISA STIG compliance on Linux systems.
 * Storage management experience, including CFS/DFS and NetApp.
 * Experience with virtualization technologies such as Proxmox, Red Hat KVM, or VMware.
 * Knowledge of IP networking and firewall administration.
 * Experience working with containers or cloud environments.

Desired Skills:

 * Experience with automation tools such as Ansible or Salt.
 * Scripting experience using Bash, Python, or Perl.
 * Familiarity with backup and recovery solutions such as Rubrik or NetBackup.
 * Experience with hyperconverged infrastructure platforms such as Harvester, Nutanix, or Cisco HyperFlex.

Education and Experience:

 * High School Diploma/GED or Associate's Degree in a technical field: 20 years of relevant experience.
 * Bachelor's Degree or higher in a technical field: 10 years of relevant experience.

Certifications:

 * Must possess a current DoD 8570/8140 IAT Level II certification

Clearance Requirement:

 * Must possess an active TS SCI with appropriate Polygraph to be considered for this role

## Description

As a Linux System Administrator, Level 3 at Independent Software, you will support mission-critical systems in a complex, multi-environment infrastructure. You will work alongside a large team of System Administrators, System Engineers, Network Engineers, and government personnel to maintain, troubleshoot, and enhance Linux and Windows systems supporting both development and operational missions.

This position involves hands-on system administration, DevOps support, system monitoring, and troubleshooting across multiple classified environments., * Administer, maintain, and troubleshoot Linux and Windows servers, including physical and virtual systems.

 * Support DevOps activities and sustainment of live, mission-critical systems.
 * Monitor system health, investigate issues, and resolve incidents and service requests using JIRA.
 * Maintain infrastructure services, including authentication, DNS, shared drives, home directories, and network communications.
 * Support backend environments across multiple classification levels, including mission and operations users.
 * Implement and maintain DISA STIG compliance and system security configurations.
 * Manage storage systems, virtualization platforms, IP networking, and firewall configurations.
 * Collaborate with System Administrators, System Engineers, Network Engineers, and government stakeholders to resolve technical issues and support mission requirements.
 * Communicate system updates, technical challenges, and operational priorities across multiple teams and contracts.