Linux System Admin

Certifications DoD 8570/8140 IAT Level II certification required Acceptable certifications include: Security+ CE, GSEC, SSCP, CCNA-Security (or equivalent). This role provides Tier III support for Linux-based servers and workstations across classified and unclassified environments, supporting engineering and computational workloads.

Linux Systems Administrator
Location: Dahlgren, VA
Schedule: Hybrid (3 days onsite / 2 days remote)
Clearance: TS or Interim TS (must be able to obtain/maintain Top Secret)
  Overview
Seeking a Linux Systems Administrator (UNIX) to support a Research, Development, Testing & Engineering (RDT&E) environment. This role provides Tier III support for Linux-based servers and workstations across classified and unclassified environments, supporting engineering and computational workloads.
Key Responsibilities

• Administer, maintain, and support Red Hat Enterprise Linux (RHEL 7.x) systems
• Provide Tier III troubleshooting and system performance optimization
• Implement automated system deployments (e.g., Kickstart / Anaconda)
• Apply and maintain DISA STIG compliance within configuration-managed environments
• Support PKI-based authentication and secure access controls
• Administer servers and end-user workstations in classified and unclassified LAN/WAN environments
• Perform system analysis and implement solutions to improve system performance and reliability
• Install, configure, patch, and maintain operating systems and applications
• Manage users, groups, and centralized authentication services
• Configure and manage:
  • Storage (partitions, LVM)
  • File systems (permissions, ACLs, encryption, NFS)
  • Logging (including remote logging)
  • Networking services (HTTP/HTTPS, DNS, SMTP, SSH, NTP)
  • Network configurations (static routes, NAT, packet filtering)
• Monitor system performance and deliver utilization and health reports
• Develop and maintain shell scripts to automate administrative tasks
• Manage backup/recovery, software distribution, and license tracking
• Collaborate with engineers supporting compute-intensive workloads
• Participate in hardware planning, vendor coordination, and cross-team collaboration

Required Qualifications

• 4–6 years of Linux system administration experience
• Experience supporting Linux-based servers and workstations
• Hands-on experience with:
  • Red Hat Enterprise Linux (RHEL 7.x)
  • DISA STIGs and DoD security compliance
• Strong knowledge of:
  • Linux system operations and command-line tools
  • Networking fundamentals in LAN/WAN environments
  • System security (firewalls, SELinux, access controls)
• Experience in classified and/or secure environments preferred
• Strong troubleshooting, analytical, and problem-solving skills
• Ability to multi-task and provide end-user support
• Strong written and verbal communication skills

Certifications

• DoD 8570/8140 IAT Level II certification required
  • Acceptable certifications include: Security+ CE, GSEC, SSCP, CCNA-Security (or equivalent)

Physical Demands

• Ability to lift up to 10–20 pounds
• Ability to stand and walk for extended periods
• Ability to bend, twist, and squat periodically