Linux Systems Engineer

CACI International Inc; Fort Meade (MD); On-site; USD 120,800 - 265,800; Full time

Job summary

CACI International Inc is seeking a Systems Administrator in Fort Meade, MD to maintain and secure enterprise IT infrastructure in a DoD environment. The role requires a TS/SCI clearance with a current polygraph, a bachelor’s degree, and hands-on experience with Windows and Linux servers, firewalls, VPNs, and virtualization.

The candidate will implement automation with Python and Ansible, manage security compliance, and ensure high availability with monitoring and vulnerability scanning.

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 environments.
• DoD 8570/8140 IAT Level II certification (Security+, CySA+, CCNA Security, or equivalent).

Skills

Active TS/SCI clearance with polygraph

10+ years Systems Administration

DoD 8570/8140 IAT Level II cert

Education

Bachelor's degree in IT, CS, Engineering, or related field

Tools

Cisco ASA

Cisco Firepower

Palo Alto firewalls

IPSEC VPN

VMware

Python

Bash

Ansible

Windows Server

Linux

Nessus

Job description

Job Title: 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: Up to 10%

Type of Travel: Local

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 environments
• DoD 8570/8140 IAT Level II certification (Security+, CySA+, CCNA Security, or equivalent)

Technical Requirements

• 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

• Containerization technologies including Docker and Kubernetes
• Infrastructure as Code (IaC) and configuration management best practices
• Enterprise monitoring and logging solutions (Splunk, Elastic, SolarWinds, 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

Pay Range

$120,800 - $265,800

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.