M365 Support Engineer

Job Title: M365 Messaging Support Engineer

Location: Plano, Texas(Onsite)

Job Type: Contract

Roles & Responsibilities:

Support a large enterprise Microsoft 365 messaging environment, providing Tier 3/Tier 4 operational support for Exchange Online, Outlook, and related services. This role focuses on incident troubleshooting, service health, access and mailbox administration, mail-flow hygiene, and continuous improvement through automation, documentation, and participation in delivery and migration initiatives.

Must Have Skills:

Provide Tier 3/Tier 4 operational support for Exchange Online, including incident response, troubleshooting, and root-cause analysis.

Administer user, shared, and resource mailboxes, including permissions, delegation, and access reviews aligned to least-privilege practices (RBAC).

Troubleshoot mail-flow issues (NDRs, delays, routing, connectors, transport rules) and perform message trace and email header analysis.

Support Outlook (Classic and New Outlook) issues including profiles, shared mailboxes, add-ins, and calendaring.

Operate email security and hygiene controls (e.g., Proofpoint and Microsoft Defender for Office 365), including quarantine review, policy troubleshooting, and escalation to security partners as needed.

Use PowerShell to perform Exchange Online and Microsoft 365 administrative tasks, reporting, and operational automation.

Support Microsoft 365 Apps servicing and organizational deployment/updates via the Microsoft 365 Apps admin center (Cloud Update) in coordination with endpoint teams.

Document operational procedures, known errors, and configuration standards; contribute to runbooks and knowledge articles.

Good to Have:

Microsoft Certifications for M365, Exchange, etc.

Hands-on experience administering Proofpoint Email Protection (e.g., policy tuning, impersonation/BEC rules, URL defense, quarantine workflows, and message trace/investigations).

Microsoft Defender for Office 365 (MDO) features and tools (Safe Links/Safe Attachments, anti-phishing, investigation workflows).

Advanced understanding of retention policies, eDiscovery/legal hold, and data loss prevention (DLP) concepts in Microsoft Purview.

Understanding of email authentication and deliverability (SPF, DKIM, DMARC) and tenant mail-flow design.

Experience analyzing new Microsoft 365 features/changes and translating impact to stakeholders and business workflows.

Familiarity with Teams, Outlook calendaring dependencies, and Entra ID (Azure AD) identity concepts used in messaging operations.

Experience supporting conferencing/room/resource scenarios and AV/calendar integration.

Comfort operating in an On-Call rotation and supporting after-hours changes, as required