System Administrator (Support Services) (San Antonio)

System Administrator - Intermediate (Support Services)

Location : San Antonio, TX (On-Site / Office)

Education : BS degree in Information Technology, Cybersecurity, Data Science, Information Systems, or Computer Science or Military Training or Cloud+ or GICSP or SSCP or Security+ or GSEC or CISSP

Certifications : Microsoft Certified : Azure Administrator Associate or Microsoft Certified : Windows Server Hybrid Administrator Associate

Position Description : The Tier 3 Systems Administrator provides advanced enterprise systems management, sustainment, and troubleshooting in support of the DHA's Domain and Directory Services Branch (DDSB). This role ensures secure, reliable, and compliant operations across both on-premises and MED365 cloud environments, delivering enterprise-level stability for mission-critical IT services. Tier 3 Systems Administrators ensure the highest level of operational stability, compliance, and resilience across DHA's enterprise IT systems. By leading enterprise encryption, monitoring, and disaster recovery readiness, this role enables secure, uninterrupted delivery of IT services that support healthcare operations across the Military Health System. Analyze, validate, configure, and sustain enterprise solutions including mJAD, Exchange Online, MED365, encryption services, and eDiscovery environments. Develop and maintain disaster recovery (DR) procedures for all supported device types, ensuring validated recovery strategies are in place and exercised. Validate and manage data encryption services on desktops, laptops, and end-user devices to ensure compliance with DoD / DHA security regulations. Customize and manage enterprise system monitoring tools, producing reports on system availability, uptime, downtime, and performance indicators. Implement and maintain Public Key Infrastructure (PKI) and Public Key Encryption (PKE) requirements in compliance with DoDI 8520.02 and enterprise security standards. Produce After Action Reports (AARs), SITREPs, and EXSUMs to document service interruptions, remediation actions, and recovery outcomes. Collaborate with Tier 2 support and enterprise engineering teams to ensure seamless escalation, resolution, and continual service improvement across the DDSB enterprise. Develops : DR procedures and validation reports; Enterprise monitoring reports and performance analytics; Encryption validation status reports o PKI / PKE compliance documentation; AARs, SITREPs, and outage resolution documentation