Senior Linux Systems Admin – TS Clearance | Automation

CACI; Sterling (VA); On-site; USD 87,000 - 182,000; Full time

Job summary

CACI is seeking a hands-on Linux Systems Administrator III to support a robust Linux environment spanning engineering workstations, build servers, VMs, and production systems. You will work across Linux, virtualization, automation, containerization, networking, and cybersecurity to build, troubleshoot, and improve mission-critical infrastructure.

Responsibilities include patching, hardening, and performance tuning of RHEL/Ubuntu systems, managing Proxmox/VMware, and implementing automation with

Qualifications

• Bachelor's degree in Computer Science, Cybersecurity, Engineering, Information Technology, or 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.

Responsibilities

• Build, configure, maintain, patch, and upgrade Linux bare-metal servers and VMs (RHEL/Ubuntu).
• Independently troubleshoot complex issues across Linux workstations, servers, VMs, 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.

Skills

Linux administration

RHEL

Networking

System hardening

Troubleshooting

Top Secret clearance

Automation

CI/CD

DNS / storage

Education

Bachelor's degree in CS/Engineering/IT or related field

Tools

Proxmox

VMware vSphere

Ansible

Puppet

Docker

Podman

Kubernetes

Nessus

Job description

CACI is seeking a hands-on Linux Systems Administrator III to support a robust Linux environment spanning engineering workstations, build servers, VMs, and production systems. You will work across Linux, virtualization, automation, containerization, networking, and cybersecurity to build, troubleshoot, and improve mission-critical infrastructure.

Responsibilities include patching, hardening, and performance tuning of RHEL/Ubuntu systems, managing Proxmox/VMware, and implementing automation with