Experience & Qualifications10+ years of hands on experience in Exchange and enterprise messaging platforms.Required Skills & ExpertiseTechnical Skills (Must Have)Expert level knowledge of:Exchange Server (2016/2019)Exchange Online and Hybrid deploymentsMicrosoft 365 messaging security stack:Defender for Office 365Purview (DLP, Retention, eDiscovery)Conditional AccessStrong understanding of:AD, Entra ID, DNS, certificatesMail flow, transport rules, connectorsAdvanced PowerShell scripting and automation capabilitiesSecurity & Access ControlStrong understanding of access control, RBAC, least privilege modelsAbility to translate security requirements into enforceable technical controlsExperience supporting audits, security reviews, and compliance assessmentsCommunication & Stakeholder ManagementStrong communication skills with the ability to explain complex technical concepts to Security teams, CISO, management, and auditors.Proven experience producing:Technical designs and architecture documentsSecurity justifications and risk assessmentsExecutive level summaries and reportsComfortable leading discussions, workshops, and escalation calls with internal teams and vendors.Key ResponsibilitiesExchange & Messaging ArchitectureDesign, implement, and support Exchange On Premises, Exchange Online, Hybrid Exchange, and Exchange Edge Transport architectures.Lead and execute Exchange migrations (On Prem → Hybrid → Exchange Online), including coexistence and decommissioning activities.Optimize mail flow, routing, transport rules, connectors, and external integrations.Troubleshoot and resolve complex Exchange, mail flow, and client access issues across hybrid environments.Microsoft 365 & Outlook Client ExpertiseSecurity, Compliance & GovernanceDesign and manage Microsoft Defender for Office 365 (Mail Defender) policies including:Enforce Conditional Access policies for secure access to Exchange Online and Microsoft 365 services.Collaborate closely with the Security Team and CISO to align messaging platforms with corporate cybersecurity strategy, regulatory requirements, and audit expectations.Identity, Access & InfrastructureStrong expertise in Active Directory (AD), Azure AD / Entra ID, identity synchronization, and access control models.Deep working knowledge of DNS, certificates, network security, TLS, and proxy based integrations.Support and integrate messaging solutions with proxy, gateway, and security appliances (email gateways, CAS proxy, inspection devices).Automation, PowerShell & OperationsAdvanced use of Exchange Online PowerShell and on prem Exchange Management Shell.