Senior Microsoft 365 Engineer

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.
• Required For This Opportunity
• 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 /

Benefits

Additional Information

Why AIS? When you join AIS, you're joining a mission-driven team that's passionate about making a difference. You'll work on projects that matter, alongside industry-leading experts, in an environment that fosters innovation, driving client success, and empowering our team to make a lasting impact. As an employee-owned company, we value collaboration, inclusivity, continuous growth, and shared success. Employee Ownership : Your contributions directly impact the company's success, and you share in its achievements. Continuous Learning : Access to resources, training, and mentorship to support your professional growth. Inclusive Culture : A workplace where diversity is celebrated, and everyone's voice is valued. Mission-Driven Work : Engage in projects that make a meaningful difference for our clients and communities. What are we looking for? At AIS, we're looking for more than just skills - we're looking for driven individuals who are passionate about making a difference, eager to grow, and aligned with our core principles. Working@AIS At AIS, we are dedicated to providing our employees with diverse opportunities to grow their careers while supporting a variety of impactful projects. For this position, we are seeking a talented individual to join AIS as a Lead Infrastructure Engineer. Core Knowledge & Skills: Aligns infrastructure strategy to business goals, leads large projects, applies compliance frameworks, designs high availability/disaster recovery and performance optimization patterns, and shapes deployment pipeline design. Work & Complexity: Directs cross-team programs, performs advanced tuning, implements high availability/failover architectures, leads audits, plans growth, and manages budgets. Quality & Independence: Delivers high-quality outcomes, sets team standards, introduces innovative solutions, and makes high-impact decisions. Teamwork & Communication: Leads the engineering team, develops talent, resolves conflicts, and communicates effectively with senior leadership and stakeholders. Consulting & Engagement: Provides high-level consulting to leadership, builds roadmaps, negotiates vendor contracts, and sponsors innovation initiatives. As your initial project assignment, you will support the unique needs of our client as a Senior Microsoft 365 Engineer. Project Summary AIS is seeking a Senior Microsoft 365 Engineer with deep technical expertise in Exchange Online, Exchange Hybrid, identity integration, and enterprise migration delivery. This role is responsible for leading the engineering, implementation, and operational support of Microsoft 365 messaging and hybrid identity solutions in complex enterprise environments, while mentoring junior engineers and partnering closely with architects, security teams, project managers, and customer stakeholders.

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