Sr. Exchange Online (EXO) Administrator (Systems Engineer) in Washington

Senior Exchange Online (EXO) Administrator Washington, DC -100% onsite Per Federal contract U.S. citizenship is required Must be able to obtain Public Trust clearance Start Date- 08/2026 through 12/2027 with possibility of long-term contract extension based on performance Open to W2 and C2C Must apply by June 30th Position Summary Manage and maintain our hybrid Exchange environment, including on-premises Exchange Server and Exchange Online (Microsoft 365). Ensure reliable email services, security, and compliance across the organization. Key Responsibilities * Administer and support hybrid Exchange infrastructure (on-premises and Exchange Online) * Manage mailbox migrations, mail flow, and hybrid connectivity between environments * Configure and maintain transport rules, DLP policies, retention policies, and email security features * Monitor system performance, troubleshoot issues, and resolve user email problems * Implement anti-spam, anti-malware, and threat protection using Microsoft Defender for Office 365 * Manage user provisioning, distribution groups, shared mailboxes, and permissions * Maintain hybrid synchronization and directory services (Azure AD Connect) * Execute eDiscovery, legal holds, and compliance investigations * Document configurations, procedures, and maintain system architecture records * Provide end-user support and training on email features Required Technologies * Microsoft Exchange Online & Exchange Server (hybrid environment) * PowerShell (Exchange Online/On-Prem Management) * Microsoft 365 Admin Center & Exchange Admin Center (EAC) * Azure Active Directory & Azure AD Connect * Exchange Online Protection (EOP) & Microsoft Defender for Office 365 * DNS, SPF, DKIM, DMARC, mail flow routing Required Experience * 4+ years managing Exchange environments * 2+ years with hybrid Exchange (on-premises + Exchange Online) * 2+ years PowerShell scripting for Exchange administration * Hands-on experience with mailbox migrations and hybrid deployments * Email security and compliance implementation Qualifications * Microsoft 365 Certified: Messaging Administrator Associate * Experience with 500+ user environments * ITIL or service management experience