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# Senior Systems Administrator

- **Company:** Information Systems Solutions
- **Location:** Sierra Vista, AZ, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Comptia Cloud+, Microsoft Windows, Active Directory, Software Applications, Systems Engineering, VoIP, Unix, CompTIA Security+, Cyber Security, Linux, Monitoring of Systems, Key Management, Microsoft Security Essentials, Network Architecture, Network Monitoring, Network Administration, Network Protocols, Server Virtualization, Visual Systems, Wide Area Networks, Network Routers, Peripherals, Firewalls (Computer Science), Information Technology, Communication Devices
- **Published:** June 27, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9000229/senior-systems-administrator

## About the Role

Must meet DoD 8140 Cyber Workforce Qualification Program requirements for System Administrator (DCWF 451), Intermediate level. One of the following:

· CompTIA Cloud+

· CompTIA Security+

· GIAC Global Industrial Cyber Security Professional (GICSP)

· GIAC Security Essentials Certification (GSEC)

· Systems Security Certified Practitioner (SSCP)

Required Skills

· Minimum 10 years of experience

· 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

## Description

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., · 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., · 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.


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