Linux System Administrator

CACI International•Sterling, VA

22h•$103,800 - $218,100•Onsite

About The Position

CACI’s National Mission Systems (NMS) group is seeking a highly motivated Linux Systems Administrator to support mission‑critical environments by ensuring secure, reliable, and scalable infrastructure across cloud and bare‑metal systems. This role puts you at the center of delivering a secure, resilient cutting‑edge ground infrastructure housing mission critical space-based applications. You will shape how national security missions are executed from space to ground using modern deployment approaches and emerging technologies. This position will work on-site at CACI facility in Sterling, VA.

Requirements

Active TS/SCI security clearance with polygraph
Bachelor’s degree in Computer Science, Information Technology, or related field of study
7+ years of experience in infrastructure, network architecture, and development environments
Proven experience with Linux system administration
Experience with Development/Test and Production Environments
Strong analytical and investigative skills to understand and resolve complex problems
Familiarity in information security and compliance with government policies.
Proficiency in cloud platforms
Strong knowledge of network protocols and security (TCP/IP, VPN, firewalls).
Experience with CI/CD tools and version control systems (Git)
Active CISSP or Security+ certification (comparable certifications in information security may also be considered)

Nice To Haves

Certifications in cloud services (AWS Certified Solutions Architect, Azure Solutions Architect, Google Cloud Professional) are highly desired
Full systems lifecycle experience
Experience with DevOps processes and tools
Experience providing customer support as part of infrastructure, platform, or help desk team.
Recognized subject matter expert in systems administration.
Working knowledge of Puppet, Satellite, IPA, Nagios, and Net App.
Strong problem-solving skills for complex and undefined issues.
Innovative mindset with a track record of making significant improvements to systems or products.

Responsibilities

Ensure optimal performance, scalability, and security of all infrastructure environments.
Perform Linux system administration and support multi‑environment infrastructure (Dev/Test/Prod).
Apply security patches, OS upgrades, and maintain system integrity and compliance.
Design, configure, and maintain LAN/WAN/VPN network infrastructure.
Monitor network performance, troubleshoot issues, and collaborate with external COMMs teams as needed.
Conduct hardware deployments, installation, configuration, and troubleshooting.
Support CI/CD pipeline environments and collaborate with DevSecOps teams to ensure availability and readiness.
Manage containerized environments and automated infrastructure (Docker, Kubernetes, Ansible, Puppet).
Create, manage, and automate cloud and virtual machine infrastructure via repeatable scripts and automation playbooks.
Troubleshoot issues involving servers, user systems, storage, and network connectivity using advanced diagnostic techniques.
Ensure compliance with government IT and security policies, including cross‑security domain requirements.
Collaborate with architects, technical leads, developers, testers, security teams, and other program stakeholders.
Support new infrastructure projects and modernization initiatives involving microservices, containers, and cloud‑native architectures.
Maintain configuration documentation for assigned systems and provide subject‑matter expertise during system design and development.