Linux Systems Administrator

Job Title:

Linux Systems Administrator Job Category:
Information Technology Time Type:
Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type:
Regular Percentage of

Travel Required:

None Type of Travel:
None*
* * We are seeking a highly skilled Linux Systems Administrator to support mission-critical enterprise infrastructure in a secure Department of Defense/Intelligence Community environment. The successful candidate will provide advanced systems administration, network infrastructure support, virtualization, automation, cybersecurity compliance, and enterprise systems maintenance while ensuring high availability, security, and operational readiness.

This position requires an experienced systems engineer capable of working independently, troubleshooting complex infrastructure issues, implementing secure enterprise solutions, and supporting highly classified operational environments.

Required Qualifications Active TS/SCI clearance with a current Polygraph Bachelor's degree in Information Technology, Computer Science, Engineering, or 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 (Security+, CySA+, CCNA Security, or equivalent)
Technical Requirements Candidates should possess strong experience in several of the following areas:

Administration and support of Cisco ASA , Cisco Firepower , and Palo Alto firewalls, including security policy management, troubleshooting, and enterprise firewall administration.

Configuration, implementation, and maintenance of IPSEC VPNs , secure VPN tunneling (including ASA-to-ASA connectivity), and secure enterprise networking.

Administration of VMware or comparable virtualization platforms, including virtual machine provisioning, maintenance, performance tuning, and lifecycle management.

Experience developing automation solutions using Python and/or Bash , with hands-on implementation of Ansible and Ansible Playbooks for infrastructure provisioning, configuration management, and operational efficiency.

Strong knowledge of enterprise server administration across Windows and Linux platforms, system hardening, patch management, and infrastructure support.

Experience performing IAVA patching , vulnerability remediation, STIG implementation, and maintaining compliance with DoD cybersecurity requirements.

Working knowledge of Secure The Enterprise (STE) and Secure The Network (STN) processes and security initiatives.

Experience utilizing Nessus for vulnerability scanning, analysis, remediation, and continuous security monitoring.

Hands-on experience with hardware installation, rack and stack , structured cabling, equipment deployment, and maintaining accurate infrastructure documentation and network diagrams.

Demonstrated ability to troubleshoot complex systems, networks, and security issues while supporting highly available enterprise environments.

Preferred Qualifications

Experience with one or more of the following is highly desirable:

Containerization technologies including Docker and Kubernetes Infrastructure as Code (IaC) and configuration management best practices

Enterprise monitoring and logging solutions (Splunk, Elastic, Solar Winds, etc.)Active Directory, DNS, DHCP, PKI, LDAP, and certificate management

Disaster recovery, backup technologies, and high-availability architectures

Cisco (CCNA/CCNP), Palo Alto (PCNSA/PCNSE), VMware (VCP), Red Hat (RHCSA), or equivalent technical certifications

This position is contingent on funding and may not be filled immediately. However, this position is representative of positions within CACI that are…