Senior Systems Administrator

Senior Systems Administrator

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, DoD, 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.

Location: Fort Huachuca, AZ