O365 Email and Calendar Senior Architect

Job Title- Microsoft 365 Email & Teams Senior Architect Position type- Full Time Work Location- Delhi NCR (Noida/Gurugram) Working style- Hybrid People Manager role: No Required Education And Certifications Critical For The Role- Any Graduate or Post-Graduate (full time) Required Years Of Experience Minimum 10+ years of relevant experience. General Description Of Role Microsoft 365 Email, Messaging & Teams Senior Architect will be responsible for leading the design, governance, and evolution of enterprise email, messaging, and collaboration platforms across the Microsoft 365 ecosystem. This role is responsible for defining the end-to-end service architecture for Exchange Online, Microsoft Teams, and related messaging services, ensuring alignment with business objectives, security requirements, and the broader enterprise IT landscape. AON IS IN THE BUSINESS OF BETTER DECISIONS At Aon, we shape decisions for the better to protect and enrich the lives of people around the world. As an organization, we are committed as one firm to our purpose, united through trust as one inclusive, diverse team and we are passionate about helping our colleagues and clients succeed. Roles & Resposibility Architecture & Design Define and maintain the end-to-end architecture for Exchange Online (mail flow, hybrid messaging, transport rules, connectors) and Microsoft Teams (voice, video, chat, meetings, integrations)Architect scalable, resilient solutions for enterprise email, including mail routing, SMTP, SPF, DKIM, DMARC, DNSSEC, connectors, and transport rulesDesign integration patterns across Exchange Online, SharePoint, OneDrive, Azure AD/Entra ID, Microsoft Purview, and third-party applicationsTranslate business requirements into secure, supportable, and future-proof technical solutions for collaboration and messagingDevelop and maintain architecture documentation, service blueprints, and solution diagramsOwn the Exchange Online and hybrid Exchange architecture, ensuring optimal mail flow, deliverability, and email lifecycle managementDesign and govern email security solutions, including DLP policies, encryption, anti-spam/anti-phishing, and email gateway integrations (e.g., Proofpoint, ACS) Lead migrations from legacy messaging platforms (on-premises Exchange, Lotus Domino, third-party SMTP) to Exchange OnlineArchitect and manage hybrid identity and messaging environments, ensuring seamless coexistence during transitionsDesign and govern Teams apps, integrations, bots, and Copilot agents within the enterprise Architect B2B federation, guest access, and external collaboration governance modelsSupport the architecture for Teams Premium features, including advanced meetings, webinars, town halls, and compliance recording Strategic Compliance & Governance Ensure architectural alignment with security, identity, access management, and compliance requirements across all messaging and collaboration servicesPartner with Security and Compliance teams to define and enforce data retention, legal hold, eDiscovery, and information protection policiesLead architectural reviews, risk assessments, and technology evaluations for messaging and collaboration platformsDefine and enforce governance frameworks for Teams provisioning, lifecycle management, and workspace policiesStay current with the Microsoft 365 roadmap and industry best practices; evaluate new features and recommend adoption strategiesProvide technical leadership during service transitions, M&A integrations, and major upgradesCollaborate with Service Owners, Engineers, Operations teams, and executive stakeholders to ensure architectural alignment Author and present technology roadmaps, executive reports, and architectural blueprints to leadership Mentor and guide engineering and operations teams on best practices and emerging capabilities. Skills/Competencies Required Essential Skills and Experience 10+ years in enterprise IT with at least 5+ years focused on Microsoft 365, Exchange, and Teams architecture Deep expertise in Exchange Online administration, hybrid Exchange, mail flow, transport rules, connectors, and email security.Strong knowledge of Teams architecture Teams App, Voice, Teams Rooms, compliance features, and app integrations Proficiency in Azure AD/Entra ID, conditional access, MFA, identity governance, and cloud security.Advanced PowerShell scripting; experience with Microsoft Graph API and Power Platform.Hands-on experience with email security solutions (DLP, encryption, SPF/DKIM/DMARC, email gateways)Familiarity with enterprise architecture frameworks (e.g., TOGAF)Experience with ITIL practices and service management tools (e.g., ServiceNow) Preferred Qualifications Microsoft Certifications: MS-700 (Managing Microsoft Teams), MS-102 (Microsoft 365 Administrator), SC-100 (Cybersecurity Architect)TOGAF or equivalent enterprise architecture certificationExperience with Copilot, AI-powered collaboration tools, and modern workplace Job Ti