Linux System Administrator

Job Title: Linux System AdministratorJob Category: Information TechnologyTime Type: Full timeMinimum Clearance Required to Start: TS/SCI with PolygraphEmployee Type: RegularPercentage of Travel Required: Up to 10%Type of Travel: Local* * *

The Opportunity:

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.

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.

Qualifications:

Required:

• 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)
• Certifications in cloud services (AWS Certified Solutions Architect, Azure Solutions Architect, Google Cloud Professional) are highly desired
• Active CISSP or Security+ certification (comparable certifications in information security may also be considered)

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.

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This position is contingent on funding and may not be filled immediately. However, this position is representative of positions within CACI that are consistently available. Individuals who apply may also be considered for other positions at CACI.

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:

$103,800 - $218,100

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.