Linux Systems Administrator

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

Job summary

CACI International Inc. is seeking a hands-on Linux Systems Administrator III to join our Infrastructure Team, supporting EW systems. You will manage Linux environments, build and patch servers, and troubleshoot across VMs, workstations, and infrastructure components.

You’ll work with Proxmox and VMware, automate with Ansible/Puppet, and deploy container technologies including Docker/Podman and Kubernetes, ensuring reliability and security in a mission-critical setting.

Qualifications

• Bachelor's degree or equivalent experience.
• 5+ years of hands-on Linux systems administration experience.
• Active Top Secret security clearance.
• Security+ certification is a plus.
• Experience with Red Hat Enterprise Linux (RHEL) and Ubuntu.
• Experience with virtualization platforms such as Proxmox and VMware vSphere.
• Experience with automation/configuration tools like Ansible and Puppet.
• Experience with container technologies including Docker/Podman.
• Strong knowledge of Linux networking, DNS, storage, authentication, and services.

Responsibilities

• Build, configure, maintain, patch, and upgrade Linux servers and VMs (RHEL/Ubuntu).
• Troubleshoot complex issues across Linux workstations, servers, and networks.
• Administer virtualization platforms (Proxmox, VMware vSphere).
• Develop automation/configuration management with Ansible and Puppet.
• Configure networking, storage, monitoring, and logging services.
• Deploy and troubleshoot Docker/Podman containers and Kubernetes environments.

Skills

Linux administration

Networking

Troubleshooting

System hardening

Security practices

Scripting

Education

Bachelor's degree in Computer Science, Cybersecurity, Engineering, IT, or related field

Tools

Proxmox

VMware vSphere

Docker

Podman

Kubernetes

Ansible

Puppet

Job description

Job Title: Linux Systems AdministratorJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start: Top SecretEmployee Type: RegularPercentage 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.Active Top Secret security clearance.Desired: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 - $181,800CACI is an Equal Opportunity 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 other protected characteristic.