Senior Systems Administrator

Public Trust: None

Requisition Type: Pipeline

Your Impact

Own your opportunity to support our nation's defense. Make an impact by connecting and securing critical operations across the globe, keeping our country safe and secure.

Job Description

Senior Systems Administrator

Overview:

The Senior Systems Administrator supports the U.S. Army Information Systems Engineering Command (USAISEC), Communications Security Directorate (CSD), by providing comprehensive enterprise-level system, network, and workstation administration services across classified and unclassified environments. This role ensures the availability, security, continuity, and performance of all CSD-managed IT systems, user endpoints, network infrastructure, and supporting technologies.

Job Duties:

• Administer, update, and maintain physical and virtual Windows, Linux, UNIX, and Active Directory servers.
• Install, configure, and sustain system and application software, patches, and updates.
• Monitor system performance and resolve operational issues.
• Manage support tickets with vendors and Government partners and coordinate warranty actions.
• Provide daily end‑user technical support for workstations, peripherals, and communication devices.
• Deploy and maintain workstations and associated hardware.
• Create and manage user accounts across classified and unclassified networks.
• Troubleshoot hardware, software, and connectivity issues.
• Deliver user training on core operating systems and software tools.
• Issue outage notifications for planned and unplanned service events.
• Serve as Key Management Infrastructure (KMI) Client Platform Administrator.
• Configure and maintain LAN/WAN devices including routers, switches, encryptors, and firewalls.
• Monitor network uptime, traffic, and performance.
• Install, test, and maintain copper and fiber cabling, resolving physical and logical network issues.
• Document cabling, port assignments, and network configurations.
• Enforce cybersecurity policies in alignment with Army, DOW, and RMF requirements.
• Manage domains, permissions, privileged accounts, and access controls.
• Support RMF and ATO processes through system documentation and compliance artifacts.
• Run vulnerability scans, validate security controls, and support continuous monitoring.
• Respond to security incidents, malware events, and classified spillage.
• Isolate affected systems, preserve evidence, and support remediation activities.
• Execute and verify daily system backups.
• Transport classified backup media to off‑site secure facilities as required.
• Maintain and test contingency and disaster recovery plans.
• Prepare for outages, hardware failures, and service disruptions.
• Support long‑term IT planning and lifecycle replacement strategies.
• Evaluate and recommend emerging technologies.
• Participate in technical boards, working groups, and governance activities.
• Prepare and deliver technical briefings and analysis.
• Support system testing, including scenario‑based and configuration‑based evaluations.
• Maintain system documentation, SOPs, and troubleshooting guides.
• Ensure documentation supports rapid onboarding of new personnel.
• Improve tools, processes, and procedures as directed by leadership.

WHAT YOU’LL NEED TO SUCCEED
Bring your technology expertise and drive for innovation to GDIT. The Systems Administrator SME must have:
● Education: At least 2 Certifications within the following disciplines: Systems and network administration, Operating systems, Server Virtualization, Videoconferencing, Fiber optic cabling, Audio/visual systems, Network and systems management and control, Media access/digital interfaces, Voice over Internet Protocol (VoIP), and/or System and/or network protocols

● Experience: 10+ years of related experience
● Must meet DoD 8140 Cyber Workforce Qualification Program requirements for System Administrator (DCWF 451), Intermediate level
● US citizenship required

● Security clearance level: TOP SECRET

Location: Fort Huachuca, AZ

GDIT IS YOUR PLACE
At GDIT, the mission is our purpose, and our people are at the center of everything we do.
● Growth: AI-powered career tool that identifies career steps and learning opportunities
● Support: An internal mobility team focused on helping you achieve your career goals
● Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
● Flexibility: Full-flex work week to own your priorities at work
● Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY
Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

Work Requirements

Years of Experience

10 + years of related experience

* may vary based on technical training, certification(s), or degree

Certification

Travel Required

Less than 10%

Citizenship

U.S. Citizenship Required