Linux Systems Administrator

Linux Systems Administrator at CACI International Inc

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI

Employee Type: Regular

Percentage of

Travel Required:

Up to 10%

Type of Travel: Continental US

We are seeking a cleared, skilled and experienced Red Hat Enterprise Linux Administrator with expertise in Puppet configuration management to join our IT team. The ideal candidate will play a crucial role in integrating, maintaining and optimizing our Linux-based infrastructure, ensuring its stability, security, and scalability. You will also be responsible for leveraging Puppet automation to streamline system provisioning, configuration, and management processes.

Candidates must be willing to work onsite at Langley AFB and have an active/current TS/SCI. Experience supporting real-time 24/7/365 support in a shift work environment is highly desired. (Shift differential pay offered.)

• Install, configure, and maintain Red Hat Enterprise Linux servers and related software.
• Perform routine system monitoring, performance tuning, and troubleshooting to ensure system reliability and performance.
• Maintain Puppet manifests and modules to automate configuration and deployment tasks.
• Implement Puppet best practices to ensure efficient and consistent management of infrastructure resources.
• Perform version control and testing of Puppet code changes.
• Collaborate with other teams to provision and configure Linux servers to meet application and business requirements.
• Develop and maintain infrastructure as code (IaC) scripts and templates to facilitate server deployments.
• Install patches according to the Patch Management Plan leveraging Satellite and YUM.
• Respond and resolve service outages, technical queries and other system related issues.
• Create and maintain system documentation, including procedures and configurations.
• Train and assist other team members on Linux and job-related tasks.

• Active TS/SCI security clearance.
• Bachelor’s degree in computer science, information technology, or a related field (or equivalent work experience).
• Minimum 5 years of relevant IT work experience.
• Security+ CE certification or equivalent.
• Proven experience as a Linux Administrator with a focus on Red Hat Enterprise Linux.
• Strong proficiency in Puppet configuration management, including writing/maintaining Puppet manifests and modules.
• Solid understanding of Linux server virtualization and containerization technologies (e.g., VMware, Docker).
• Knowledge of scripting languages (e.g., Ansible, Bash, Python) for automation tasks.
• Familiarity with version control systems (e.g., Git).
• Excellent problem‑solving skills and the ability to work effectively in a team environment.

• Minimum of two years of DCGS experience.
• Relevant certification (e.g., RHCE, Puppet Certified Professional, Linux Essentials) are a plus.
• Experience with one or more of the following technologies: YUM, Red Hat Satellite, Kickstart, Harbor, Kubernetes.
• Experience with shift work.

• A culture of integrity – CACI places character and innovation at the center of everything we do.
• An environment of trust – every employee brings unique contributions; autonomy and flexible time off benefit.
• A focus on continuous growth – you will advance your career and our legacy.
• Your potential is limitless; so is ours.

Pay Range: $75,200-$158,100

CACI 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.