Exchange Online (EXO) Specialist

• Design and maintain the global EXO and Hybrid architecture, aligning with Client security, compliance, and M365 tenant strategies
• Define scalable architectures for mailbox serves, transport services, client access, and application integrations
• Govern authentication modernization (OAuth2, Graph API) in response to Microsoft deprecations such as EWS retirement
• Establish EXO governance models, role definitions, and admin access control frameworks in alignment with security & compliance teams
• Oversee hybrid configuration (Exchange On-Prem + EXO), ensuring stability of provisioning flows, directory synchronization, and mail routing
• Support and coordinate large mailbox migrations, including pool-ID migrations and workload transitions mandated by MBAG timelines
• Lead issue resolution involving EXO team, Microsoft support, and internal stakeholders across ITT/IT, EXO-Migration teams, and business application owners
• Implement and optimize EXO security baselines, modern authentication, forwarding restrictions, and audit controls as mandated by corporate guidelines
• Work with Contract Management to evaluate new licensing and security enhancements such as Defender for Office features and E3/E5 add-ons
• Ensure messaging compliance requirements are met across geographies (EU, India), coordinating with MBAG legal, identity, and compliance teams
• Lead upgrades of legacy app integrations from deprecated EWS to Microsoft Graph before Microsoft deadlines
• Provide architectural guidance to application owners transitioning integrations into the modern authentication ecosystem
• Act as technical escalation point for EXO L2/L3 teams and external partners
• Ensure adherence to Client change management, ITSM processes, and global operations frameworks

• 7-10+ years in Exchange/EXO architecture, including hybrid deployments in large enterprises
• Deep expertise with Exchange Online, Exchange Server (2016/2019), AAD Connect, Identity, OAuth, Graph API transitions
• Experience managing cloud migrations in multi-tenant environments
• Strong understanding of email security, EOP, Defender for Office, and regulatory compliance in global organizations
• Excellent communication, documentation, and collaboration skills
• Proactive mindset with a focus on continuous improvement and threat prevention
• Microsoft Certified: Messaging Administrator Associate
• Microsoft 365 Certified Enterprise Administrator Expert
• TOGAF / CISSP (advantage)

TOGAF / CISSP (advantage)