L3 Microsoft 365 Engineer
Astreya · Chicago, United States · full time · On site · September 29, 2026
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Microsoft 365 Administration
• Provide L3 support for Microsoft 365 services and act as the final escalation point for complex incidents.
• Design, implement, and maintain Microsoft 365 solutions aligned with business requirements.
• Perform tenant administration, health monitoring, and service optimization.
Exchange Online
• Manage Exchange Online administration, mail flow, transport rules, connectors, and compliance policies.
• Troubleshoot complex mailbox, calendaring, mail routing, and hybrid Exchange issues.
• Support email migration and modernization initiatives.
Microsoft Teams
• Administer Teams policies, governance, voice configurations, and collaboration services.
• Troubleshoot Teams client, meeting, calling, and integration issues.
• Support Teams adoption and optimization initiatives.
SharePoint Online
• Manage SharePoint Online sites, permissions, storage, content management, and governance.
• Troubleshoot site performance, access, search, and integration issues.
• Support collaboration and document management solutions.
Microsoft Entra ID (Azure AD)
• Administer user lifecycle management, groups, RBAC, Conditional Access, MFA, and Identity Governance.
• Manage SSO, application integrations, and federation services.
• Support identity security, access reviews, and compliance initiatives.
Security & Compliance
• Implement and maintain Microsoft security best practices.
• Support audits, compliance requirements, and security investigations.
• Collaborate with cybersecurity teams to enhance tenant security posture.
Automation & Continuous Improvement
• Develop automation scripts using PowerShell.
• Create operational runbooks and knowledge articles.
• Identify opportunities for service improvements and operational efficiencies.
Required Skills
• Expert knowledge of Microsoft 365 administration.
• Strong expertise in:
o Exchange Online
o Microsoft Teams
o SharePoint Online
o Microsoft Entra ID (Azure AD)
• Experience with PowerShell scripting and automation.
• Strong understanding of Microsoft 365 security and compliance features.
• Experience with hybrid environments and identity synchronization.
Preferred Qualifications
• Microsoft Certified: Enterprise Administrator Expert.
• Microsoft Certified: Identity and Access Administrator Associate.
• Microsoft Certified: Messaging Administrator Associate.
• Experience with Intune, Purview, Defender, and Power Platform is desirable.
Key Competencies
• Advanced troubleshooting and problem-solving skills.
• Strong stakeholder communication and documentation skills.
• Ability to lead major incident resolution and root-cause analysis.
• Experience working in global 24x7 enterprise environments.
- Employer
- Astreya
- Location
- Chicago, United States · On site
- Contract
- full time