System Administrator

Delaware Nation Industries is seeking a System Administrator - Mid to support the Air Force Joint Worldwide Intelligence Communications System/Joint Interoperability Test and Services mission. The System Administrator will provide day-to-day administration, maintenance, monitoring, troubleshooting, and security support for enterprise systems operating across classified and unclassified environments.

About the role

The successful candidate will work as part of a collaborative systems administration team supporting Linux and Windows platforms, virtualized infrastructure, network-connected services, and mission-critical users. This position requires sound technical judgment, strong documentation skills, and the ability to troubleshoot issues while maintaining system availability and compliance with DoD security requirements.

Responsibilities

• Administer, configure, maintain, and troubleshoot Linux and Windows servers, workstations, applications, and related computing environments
• Install operating systems, software, patches, updates, and security fixes in accordance with approved change-control and maintenance procedures
• Monitor system health, availability, capacity, and performance; identify trends and recommend corrective actions
• Perform Tier II and Tier III troubleshooting for hardware, operating system, application, virtualization, networking, and connectivity issues
• Manage user accounts, permissions, groups, access controls, and system configurations in accordance with security policies
• Support systems operating across classified and unclassified networks, including mission-essential environments and controlled data-transfer processes
• Perform or support electronic and manual data transfers between authorized network environments
• Maintain system backups, recovery procedures, configuration records, inventories, and standard operating procedures
• Apply DISA Security Technical Implementation Guides (STIGs), vulnerability-remediation procedures, and other applicable DoD security controls
• Support vulnerability scanning and remediation activities, including review and correction of findings from tools such as ACAS/Nessus when assigned
• Assist with system builds, provisioning, integration, software installation, upgrades, and restoration activities
• Support virtual machines and virtualized infrastructure, including VMware or comparable technologies
• Coordinate with cybersecurity, network, service desk, application, and Government teams to resolve incidents and maintain continuity of operations
• Document incidents, changes, troubleshooting actions, and resolutions in the designated IT service-management or configuration-management system
• Participate in scheduled maintenance, testing, exercises, and after-hours or on-call support as required by the contract
• Cross-train with other administrators and contribute to knowledge transfer, technical documentation, and process improvement

Requirements

• Active DoD TS/SCI security clearance
• At least three (3) years of professional systems administration experience
• DoD 8570/8140-compliant IAT II certification, such as Security+ CE or another current DoD-approved equivalent
• Demonstrated experience administering Linux and/or Windows operating systems in an enterprise or DoD environment
• Working knowledge of TCP/IP networking, DNS, DHCP, SSH, file and print services, and common server-support concepts
• Experience with system patching, configuration management, backups, troubleshooting, and security hardening
• Ability to analyze technical problems, identify root causes, and implement effective solutions with appropriate documentation
• Strong written and verbal communication skills and the ability to work effectively independently and on a small technical team
• Ability to support classified systems in accordance with applicable security, access-control, and operational procedures

Preferred Qualifications

• Experience supporting Air Force, JWAC, JITS, intelligence, or other DoD mission environments
• Experience with Red Hat Enterprise Linux, CentOS, Debian, or comparable Linux distributions
• Experience with VMware vSphere, virtual machine provisioning, or virtual infrastructure operations
• Familiarity with ACAS/Nessus, STIG Viewer, HBSS/endpoint security tools, or comparable DoD cybersecurity tools
• Experience with scripting or automation using Python, Bash, PowerShell, Ansible, Puppet, or similar technologies
• Familiarity with SAN/NAS storage, NFS, iSCSI, VDI, load balancing, or cross-domain/data-transfer systems
• ITIL, Linux, VMware, or related industry certification
• Bachelor's degree in information technology, computer science, cybersecurity, engineering, or a related field; equivalent experience may be considered