UNIX​/Linux OS Administrator, Sr Principal

Position Overview

UNIX/Linux OS Administrator – GDIT, Offutt AFB, NE

Responsible for administering and securing Linux/Unix environments for USSTRATCOM’s critical national security missions. Work includes system maintenance, security hardening, and 24/7 IT service support for classified networks.

• Perform system administration for enterprise Linux/Unix solutions.
• Install, configure, and maintain Linux/Unix operating systems.
• Analyze and resolve issues related to servers, hardware, applications, and software.
• Monitor system performance and ensure compliance with security standards.
• Manage daily operations of all Linux servers and associated resources.
• Configure and deploy virtual machines, including backup and recovery procedures.
• Maintain patch releases, design patch strategies, and keep systems updated per program standards.
• Provide Tier 2 and Tier 3 troubleshooting support and interface with end‑users and technical teams.
• Conduct Security Technical Implementation Guide (STIG) compliance assessments, harden Linux systems per DoD standards, and uphold security policies.

• BS degree in a related field (or equivalent experience).
• 10+ years of IT/DoD systems administration experience.
• Top Secret clearance with SCI eligibility.
• Required certifications: ITIL 4 Foundation (within 9 months of start) and one of GFACT, CND, Security+, or GSEC.
• Strong experience with Linux distributions (RHEL, CentOS, Ubuntu, SUSE).
• Experience with VMware, Hyper‑V, KVM, or cloud‑based VMs.
• Knowledge of security hardening standards (DISA STIGs, CIS benchmarks).
• OS patching and vulnerability remediation expertise.
• SELinux or App Armor experience.
• Firewall rule management (firewalld, iptables).
• Secure configuration of SSH, PAM, and sudo policies.
• Strong communication skills for troubleshooting and translating technical issues.
• Incident response and root‑cause analysis capabilities.
• Ability to collaborate with networking, storage, and security teams.

• Health benefits:
  
  Medical, Dental, Vision.
• 401(k) with company match.
• Educational assistance and e‑Learning.
• Flexible work week.
• Internal mobility and career advancement support.
• Rewards and recognition programs.
• Collaborative, innovative work environment.

Salary range: $120,275 – $162,725 (subject to experience and location).

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans