System Administrator with Security Clearance

Description 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.

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 Required Qualifications
• 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.

Other Duties This job description is not designed to cover or contain a comprehensive listing of activities, duties, or responsibilities required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.