Senior Microsoft 365 Engineer

AIS (Applied Information Sciences) is a mission-driven company dedicated to making a difference through innovative projects. They are seeking a Senior Microsoft 365 Engineer responsible for leading the engineering, implementation, and operational support of Microsoft 365 messaging and hybrid identity solutions in complex enterprise environments.

Responsibilities:

• Lead implementation, administration, and advanced support for Exchange Online in enterprise Microsoft 365 environments
• Engineer and maintain Exchange Hybrid configurations, including coexistence, mail flow, organization relationships, free/busy, autodiscover, and mailbox move capabilities
• Design, configure, and troubleshoot complex mail flow scenarios involving connectors, accepted domains, transport rules, relay configurations, journaling dependencies, and secure message routing
• Lead identity-dependent messaging integrations across hybrid environments, including Entra ID synchronization, authentication dependencies, directory object consistency, and access control alignment
• Execute and oversee complex migration activities including Exchange Online onboarding, hybrid mailbox migrations, tenant-to-tenant migrations, archive migrations, and messaging coexistence transitions
• Troubleshoot escalated issues related to Exchange Hybrid, hybrid authentication, mail routing, mailbox provisioning, directory synchronization, client connectivity, and service interoperability
• Develop engineering standards, migration runbooks, validation procedures, rollback plans, and operational documentation to support repeatable delivery
• Provide technical leadership during discovery workshops, design sessions, cutover events, and post-migration stabilization efforts
• Support implementation of security-related controls affecting Exchange and identity, including modern authentication, MFA dependencies, conditional access impacts, and legacy protocol remediation
• Participate in change planning, risk identification, issue management, and root cause analysis for messaging and identity services

Requirements:

• 6–10+ years of experience engineering and administering Microsoft messaging and identity environments
• Deep hands-on experience with Exchange Online and Exchange Hybrid in enterprise environments
• Strong understanding of Exchange Server as it relates to hybrid coexistence, recipient management, mail routing, and legacy integration dependencies
• Strong experience with Microsoft Entra ID, Entra Connect / Azure AD Connect, hybrid identity, directory synchronization, and authentication troubleshooting
• Proven experience leading or executing large-scale Exchange migration efforts, including hybrid mailbox moves, tenant transitions, or staged enterprise migrations
• Advanced knowledge of SMTP, DNS, MX, SPF, DKIM, DMARC, autodiscover, and enterprise mail flow design and troubleshooting
• Strong PowerShell skills for Exchange Online, Microsoft 365, and automation of administrative or migration tasks
• Experience developing technical documentation, migration plans, cutover checklists, and post-deployment support artifacts
• Experience with tenant-to-tenant migration tools or third-party migration platforms
• Experience supporting Microsoft 365 projects in regulated, high-security, or large enterprise environments
• Familiarity with Microsoft Purview compliance features related to mailbox retention, eDiscovery, archive strategies, and data governance
• Knowledge of conditional access, identity protection concepts, and secure external access considerations that impact messaging and authentication
• Experience integrating Exchange and identity changes into broader Microsoft 365 transformation efforts
• Exposure to Teams, SharePoint Online, or other adjacent Microsoft 365 workloads
• Relevant Microsoft certifications in Microsoft 365, Exchange, Azure, or Identity and Access Management