Linux Systems Administrator

Job Title:

Linux Systems Administrator
Job Category:
Information Technology
Time Type:
Full time
Minimum Clearance Required to Start:
Top Secret
Employee Type:
Regular
Percentage of

Travel Required:

Up to 10%
Type of Travel:
Continental US
* * *

CACI is seeking a hands-on Linux Systems Administrator III to join our Infrastructure Team supporting our family of Electronic Warfare (EW) systems.

Support our end-to-end Linux environment, including engineering workstations, build servers, virtual machines, and production systems.

Apply your Linux expertise to build, maintain, troubleshoot, and improve mission-critical infrastructure.

Work across Linux, virtualization, automation, containerization, networking, and cybersecurity technologies.

Identify and implement improvements that increase infrastructure reliability, security, performance, and maintainability.

• Build, configure, maintain, patch, and upgrade Linux bare-metal servers and virtual machines, primarily running Red Hat Enterprise Linux (RHEL) and Ubuntu.
• Independently troubleshoot complex issues across Linux workstations, servers, virtual machines, infrastructure appliances, storage, authentication, and network connectivity.
• Administer and troubleshoot virtualization platforms including Proxmox and VMware vSphere.
• Develop and maintain automation and configuration management solutions using Ansible and Puppet.
• Configure, optimize, troubleshoot, and maintain Linux networking and supporting infrastructure services.
• Implement and maintain system monitoring, logging, and dashboards to proactively identify performance and availability issues.
• Design and implement infrastructure improvements to increase reliability, fault tolerance, scalability, and performance.
• Deploy, administer, and troubleshoot containerized workloads using Docker and Podman, and support Kubernetes environments.
• Review Nessus and other vulnerability scan results and remediate identified vulnerabilities through patching, configuration changes, and system hardening.
• Coordinate and perform recurring system updates, upgrades, and patching across development, test, and production environments.

• Bachelor's degree in Computer Science, Cybersecurity, Engineering, Information Technology, or a related field, or equivalent experience.
• 5+ years of hands-on Linux systems administration experience.
• Strong experience administering and troubleshooting Red Hat Enterprise Linux (RHEL) or similar enterprise Linux environments.
• Experience with Linux installation, configuration, patching, system hardening, and performance troubleshooting.
• Experience with virtualization platforms such as Proxmox and/or VMware vSphere.
• Experience with automation and configuration management tools such as Ansible and Puppet.
• Experience with container technologies including Docker and/or Podman.
• Strong working knowledge of Linux networking, DNS, storage, authentication, and system services.
• Ability to independently troubleshoot complex infrastructure issues across physical and virtual environments.
• Active Top Secret security clearance.

• Security+ certification.
• Hands-on experience administering or supporting Kubernetes or another container orchestration platform.
• Experience with infrastructure monitoring, centralized logging, CI/CD, or automated deployment environments.
• Experience supporting Linux infrastructure in classified, disconnected, or restricted-network environments.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose - to ensure the safety of our nation.

CACI values the…