Linux Systems Administrator

CACI International • Fort Meade, MD

24d • $120,800 - $265,800

About The Position

CACI is seeking an experienced Linux Systems Administrator to support mission-critical enterprise infrastructure in a secure Department of Defense and Intelligence Community environment. The role provides systems administration, network infrastructure support, virtualization, automation, cybersecurity compliance, and enterprise systems maintenance to help ensure high availability, security, and operational readiness. The successful candidate will work independently to troubleshoot complex infrastructure issues, implement secure enterprise solutions, and support highly classified operational environments.

This is a regular, full-time position requiring an active TS/SCI clearance with a current polygraph. The position is contingent on funding and may not be filled immediately; applicants may also be considered for other CACI positions. Travel is not required.

CACI describes a culture centered on integrity, character, and innovation, with autonomy through a flexible time off benefit and access to learning resources. The company highlights continuous growth, mission-focused work, and competitive compensation and benefits. The proposed salary range is $120,800–$265,800; final compensation depends on factors including location, contract labor categories and wage rates, prior experience, skills, education, and certifications.

Requirements

• Active TS/SCI clearance with a current polygraph.
• Bachelor's degree in Information Technology, Computer Science, Engineering, or a related field; additional relevant experience may be substituted for education.
• At least 10 years of progressive Systems Administration experience supporting enterprise IT infrastructure in secure Linux environments.
• DoD 8570/8140 IAT Level II certification, such as Security+, CySA+, CCNA Security, or equivalent.
• Strong experience in several listed technical areas, including enterprise firewall administration, secure networking and VPNs, virtualization, automation, server administration, DoD cybersecurity compliance, vulnerability scanning, hardware deployment, and infrastructure troubleshooting.

Nice To Haves

• Experience with containerization technologies such as Docker and Kubernetes.
• Knowledge of Infrastructure as Code (IaC) and configuration management best practices.
• Experience with enterprise monitoring and logging solutions such as Splunk, Elastic, or SolarWinds.
• Experience with Active Directory, DNS, DHCP, PKI, LDAP, and certificate management.
• Experience with disaster recovery, backup technologies, and high-availability architectures.
• Cisco CCNA/CCNP, Palo Alto PCNSA/PCNSE, VMware VCP, Red Hat RHCSA, or equivalent technical certifications.

Responsibilities

• Administer and support enterprise Linux and Windows server environments, including system hardening, patch management, and infrastructure support.
• Administer Cisco ASA, Cisco Firepower, and Palo Alto firewalls, including security policies, troubleshooting, and enterprise firewall operations.
• Configure, implement, and maintain IPSEC VPNs and secure VPN tunnels, including ASA-to-ASA connectivity.
• Administer VMware or comparable virtualization platforms, including virtual machine provisioning, maintenance, performance tuning, and lifecycle management.
• Develop automation using Python and/or Bash and implement Ansible and Ansible Playbooks for infrastructure provisioning, configuration management, and operational efficiency.
• Perform IAVA patching, vulnerability remediation, and STIG implementation while maintaining compliance with DoD cybersecurity requirements.
• Support Secure The Enterprise (STE) and Secure The Network (STN) processes and security initiatives.
• Use Nessus for vulnerability scanning, analysis, remediation, and continuous security monitoring.
• Install hardware; perform rack-and-stack work, structured cabling, and equipment deployment; and maintain infrastructure documentation and network diagrams.
• Troubleshoot complex systems, network, and security issues in highly available enterprise environments.

Benefits

• Flexible time off benefit.
• Learning resources and learning and development opportunities.
• Healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior