Email Services Systems Administrator - TS/SCI with Polygraph

ENDPOINT MANAGEMENT SYSTEMS ADMINISTRATOR YOUR IMPACT Own your opportunity to support national defense. Your work will help keep critical operations secure and connected across the global enterprise—directly contributing to a mission that protects our nation every day. CIO Infrastructure Services (CIS) is growing, and we invite both experienced incumbents and new team members to be part of what’s next. Together, we’ll strengthen continuity and drive the next generation of innovation. WHAT YOU’LL NEED TO SUCCEED EXPERIENCE REQUIREMENTS: Email Services Systems Administrator Senior – Requires a Bachelor’s degree in an IT-related field or 8+ years of relevant IT experience in lieu of a degree. Email Services Systems Administrator Principal – Requires a Bachelor’s degree in an IT-related field or 10+ years of relevant IT experience in lieu of a degree. Email Services Systems Administrator Sr. Principal – Requires a Bachelor’s degree in an IT-related field or 12+ years of relevant IT experience in lieu of a degree. CLEARANCE: Active TS/SCI clearance with a favorable Polygraph CERTIFICATIONS: Meet DoD 8140 Information Assurance Workforce certification requirements (e.g., Security+ CE) Hands-on experience administering Exchange (on-premises) and M365 messaging services in enterprise or multi-network environments Strong proficiency with email routing, SMTP, DNS, authentication, certificates, and mobile/remote email access Experience with secure configuration, retention/archival policies, and compliance requirements for enterprise messaging Familiarity with patching, vulnerability remediation, and configuration compliance for messaging platforms Ability to diagnose and resolve complex messaging, access, routing, and authentication issues across hybrid environments Strong documentation, communication, and cross-team collaboration skills US citizenship required LOCATION: Onsite Key Responsibilities Administer, maintain, and troubleshoot enterprise Exchange and M365 email systems, ensuring high availability, secure operations, and reliable mail flow across multiple networks Support email architecture components including mailbox databases, transport services, journaling, archival/retention systems, SMTP relays, and message hygiene tools Manage identity and access for messaging services, including authentication, PKI-based access, mobile access policies, and integration with directory services Monitor system health, capacity, and performance; perform diagnostics; and implement corrective actions for service disruptions or degraded functionality Support migrations, upgrades, and sustainment of both on-premise and cloud-based messaging platforms, ensuring seamless integration and minimal user impact Execute backup, recovery, and failover operations for Exchange systems and related messaging components, validating resilience and continuity of operations Troubleshoot complex issues involving authentication, DNS, PKI, mobile clients, cross-domain routing, and dependencies across hybrid environments Maintain documentation, SOPs, service configurations, and operational artifacts supporting sustainment, change management, and continuous improvement Apply security patches, cumulative updates, and platform hotfixes across Exchange, M365, and messaging-related infrastructure to maintain compliance and secure service baselines Identify and remediate noncompliant messaging systems by reviewing vulnerability and SCAP reports, resolving patch exceptions, and validating corrective actions across messaging environments #J-18808-Ljbffr