Systems Administrator (Windows/Linux)

Administer, patch, and maintain Red Hat Linux and Windows servers and VMware virtual machines across classified and unclassified domains. Monitor enterprise services such as Active Directory, DHCP, and authentication daily using centralized management tools, and resolve or escalate availability and performance issues. Support on-premises storage area network (SAN) and network-attached storage (NAS) operations, including capacity monitoring and allocation. Run scheduled backups of mission-critical data and infrastructure configurations using Commvault or similar tools, verify job completion, and remediate failures. Perform quarterly data recovery tests and real-world restores, and record the results in the recovery history. Help develop and maintain on-premises backup, recovery, and business continuity/disaster recovery plans aligned with NIST SP 800-53 Rev. 5 and SP 800-34 Rev. 1. Support restoral of enterprise services at alternate operating locations during COOP exercises and real-world events, ready for implementation within 24 hours of notification. Install, configure, and maintain physical servers, storage arrays, and VMware hosts, and coordinate hardware repairs and replacements with vendors. Collect virtual machine and host performance and capacity data to support right-sizing and hardware recommendations. Implement approved changes through the configuration and change management process and update system baselines and diagrams. Maintain standard operating procedures, configuration records, and ticket histories, and escalate complex issues to senior administrators.

Linux Operating System, Microsoft Windows System Administration, Linux Operating System, Microsoft Windows System Administration, Systems Administration/Management, CompTIA Server+, CompTIA Security+, Cloud Computing, U.S. National Institute of Standards and Technology (NIST), Virtual Machine (VM), Experienced Junior Systems Administrator (Windows/Linux) Must have Top Secret clearance with SCI eligibility Must have either Server+ CE, Security+ CE or Cloud+ CE certification 3+ years of specialized experience in system administration Must have experience within Federal/Department of War (DoW) environments Must have experience with server platforms (Red Hat Linux and similar), virtualization platforms (VMware and similar), and backup applications (Commvault and similar). Expert-level knowledge of server platforms (Red Hat Linux and similar), virtualization platforms (VMware and similar), and backup applications (Commvault and similar); expert-level knowledge of backup and recovery and business continuity/disaster recovery practices for a highly distributed enterprise, including restoral of services at an alternate site; and knowledge of NIST SP 800-53 Rev. 5, SP 800-34 Rev. 1, and SP 800-209, and of DAF COOP planning guidance (DAFI 10-208). Bachelor s required or an additional 4 years of experience