Linux Systems Administrator

CACI • Fort Meade, MD

24d

About The Position

The Linux Systems Administrator supports mission-critical enterprise infrastructure in a secure Department of Defense/Intelligence Community environment. The role provides advanced systems administration, network infrastructure support, virtualization, automation, cybersecurity compliance, and enterprise systems maintenance while ensuring high availability, security, and operational readiness. The administrator works independently to troubleshoot complex infrastructure issues, implement secure enterprise solutions, and support highly classified operational environments.

The position is contingent on funding and may not be filled immediately. Applicants may also be considered for other positions at CACI.

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.
• 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 of the listed technical areas, including firewall administration, secure networking, virtualization, automation, enterprise server administration, cybersecurity compliance, vulnerability scanning, hardware deployment, and troubleshooting.

Nice To Haves

• Experience with containerization technologies, including Docker and Kubernetes.
• Experience with 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 firewalls, including Cisco ASA, Cisco Firepower, and Palo Alto systems; manage security policies and troubleshoot firewall issues.
• Configure, implement, and maintain IPSEC VPNs and secure VPN tunnels, including ASA-to-ASA connectivity.
• Administer virtualization platforms such as VMware, 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.
• Administer Windows and Linux enterprise servers, including system hardening, patch management, and infrastructure support.
• Perform IAVA patching, vulnerability remediation, and STIG implementation, and maintain 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; rack and stack and deploy equipment; perform structured cabling; 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 benefits.
• Wellness benefits.
• Financial benefits.
• Retirement benefits.
• Family support benefits.
• Continuing education benefits.
• Time off benefits.
• Competitive compensation and benefits options designed to support employees and their families.

What This Job Offers

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