Exchange Online - M365 - Engineer - Messaging And Collaboration

At EY, youll have the chance to build a career as unique as you are, with the global scale, support, inclusive culture and technology to become the best version of you. And were counting on your unique voice and perspective to help EY become even better, too. Join us and build an exceptional experience for yourself, and a better working world for all. Exchange Online (M365) Engineer Messaging & Collaboration The opportunity You will be responsible for designing, engineering, implementing, and supporting the firms global Messaging and Directory Services infrastructure, with primary focus on Microsoft Exchange Online (M365) and cloud-based messaging platforms. This role is part of a broader shift from operational support to engineering-led, automation-first messaging platform ownership. This role applies ITIL-based service management practices and encompasses a broad range of responsibilities, including vendor coordination, infrastructure maintenance and upgrades, deployments, migrations, introduction of new technologies and services, documentation, knowledge sharing, training, and operational support across related platforms. Your Key Responsibilities Design, implement and maintain Microsoft Exchange Online (M365) as the primary platform, with supporting knowledge of onpremises Exchange (where required)Provide L4 escalation support for complex incidents escalated from L3.Own projects endtoend: translate requirements, plan delivery, execute, and drive to successful completion.Proactively identify and resolve issues before they impact users or services.Collaborate and communicate effectively with crossfunctional engineering, operations, and product teams.Demonstrate selfstarter leadershiptake initiative, show impact, and continuously improve ways of working.Shape and advocate a forward-looking technology vision for Exchange Online and cloud messaging platforms; champion modern, secure, and scalable approaches.Execute migrations to/from Exchange Online (M365), including hybrid, tenanttotenant, and cloud transformation initiatives - planning, tooling, cutover, and postmigration stabilization.Administer Microsoft 365 services related to the role (e.g., Power BI, Power Apps, Power Automate) where applicable.Administer Active Directory, including objects, policies, and integrations relevant to messaging services.Troubleshoot deeply across Exchange Online, hybrid environments, identity, and networking layers and prevent recurrence.Innovate & lead: Generate, prioritize, and deliver SIP (Service Improvement Plan) and automation initiatives that reduce toil, improve reliability, and measurably enhance user experience; build the business case, secure alignment, and drive adoption across engineering and operations.Gather and document business/technical requirements; design hybrid and cloud-aligned messaging solutions, with onprem components as applicable (sizing, documentation, cost estimates).Plan and execute preproduction testing (test cases, pilot planning, risk/issue mitigation) and manage production deployments.Follow ITIL processes for Incident, Problem, and Change; contribute to continual service improvement.Contribute to projects across migrations, buildouts, and related infrastructure initiatives as assigned.Resolve incidents and problem cases using vendor guidance, platform expertise, and environment knowledge.Evaluate and test new capabilities through PoCs; recommend product/service enhancements with vendors.Perform maintenance and upgrades to sustain performance, reliability, and security. Skills And Attributes For Success Strong analytical capability across Exchange Online (M365), mail flow, identity, and Active Directory technologies.Demonstrates sound judgment, discretion, and professionalism in decisionmaking.Excellent communication skillsverbal, written, listeningalong with strong interpersonal, organizational, and projectcoordination abilities.Effective teaming and collaboration, with strong organization and timemanagement skills.High crosscultural awareness and ability to work seamlessly with global stakeholders.Solid understanding of ITIL processes and their application within enterprise operations.Ability to manage strategic vendors, including Microsoft.Commitment to knowledge sharing, with the ability to deliver handson or classroomstyle training to peers and team members. To qualify for the role, you must have 8+ years of hands-on experience with Microsoft Exchange Online (M365) design & implementation, including administration, troubleshooting, and engineering at scale; onprem Exchange experience is beneficial but not mandatoryProven experience supporting large-scale Exchange Online implementations, including hybrid and cloud transformation initiatives, complex migrations and hybrid/onpremisestoM365 transition projects.Extensive handson administration of Exchange Online (M365) in enterprise-scale environments; familiarity with Exchange Server (2016/2019) .