Linux Systems Administrator

CACI International; Town of Texas (WI); On-site; USD 87,000 - 182,000; Full time

Job summary

CACI International in Wisconsin seeks a hands-on Linux Systems Administrator III to join our Infrastructure Team supporting EW systems. You will build, troubleshoot, and maintain mission-critical Linux environments including workstations, build servers, and virtual machines.

Responsibilities include patching, hardening, automating with Ansible and Puppet, managing virtualization (Proxmox, VMware), and deploying Docker/Podman containers while coordinating updates across dev/test/prod.

Qualifications

• Bachelor’s degree in a related field or equivalent experience.
• 5+ years of hands-on Linux systems administration.
• Experience with RHEL or similar enterprise Linux.
• Experience with virtualization platforms (Proxmox, VMware).
• Experience with Ansible and Puppet.
• Experience with Docker/Podman and networking.

Responsibilities

• Build, configure, maintain, patch, and upgrade Linux servers and VMs running RHEL/Ubuntu.
• Troubleshoot complex issues across Linux workstations, servers, VMs, storage, and network.
• Administer virtualization platforms such as Proxmox and VMware vSphere.
• Develop and maintain automation/configuration management with Ansible and Puppet.
• Configure and maintain Linux networking, storage, and services.
• Deploy container workloads with Docker and Podman; support Kubernetes environments.
• Review vulnerability scans and remediate findings; patching and hardening.
• Coordinate system updates across development, test, and production environments.

Skills

Linux system administration

RHEL

VMware vSphere

Proxmox

Ansible

Puppet

Docker / Podman

Networking

Security clearance

Education

Bachelor's degree or equivalent experience

Tools

Proxmox

VMware vSphere

Ansible

Puppet

Docker

Podman

Job description

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

* * *

The Opportunity

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.
Responsibilities:
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.

Required

• 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.
• Ability to obtain and maintain a Top Secret security clearance.

Desired

• 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.

What You Can Expect

A culture of integrity.

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.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation’s most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

The proposed salary range for this position is:

$86,600 - $181,800

CACI is anEqualOpportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any otherprotectedcharacteristic.