L3 Microsoft 365 Engineer

Astreya Partners, LLC; Chicago (IL); On-site; USD 100,000 - 150,000; Full time

Job summary

Astreya Partners, LLC is seeking a seasoned Microsoft 365 Administrator to manage and optimize our cloud platform across Exchange Online, Teams, SharePoint Online and Azure AD. The role includes security, compliance, and automation responsibilities to ensure reliable IT services for a global enterprise.

You will lead incident resolution for complex Microsoft 365 issues, design scalable solutions, and partner with security teams to protect tenant integrity while driving operational efficiency

Qualifications

• Strong knowledge of Microsoft 365 administration across core services.
• Experience with hybrid environments and Azure AD identity governance.
• Experience with scripting and automation to streamline operations.
• Familiarity with security and compliance features within Microsoft 365.

Responsibilities

• Provide L3 support for Microsoft 365 services and act as final escalation for complex incidents.
• Design, implement, and maintain Microsoft 365 solutions aligned with business requirements.
• Perform tenant administration, health monitoring, and service optimization.
• Manage Exchange Online administration, mail flow, transport rules, connectors, and compliance policies.
• Troubleshoot mailbox, calendaring, mail routing, and hybrid Exchange issues.
• Administer Teams policies, governance, voice configurations, and collaboration services.
• Troubleshoot Teams client, meeting, calling, and integration issues.
• Manage SharePoint Online sites, permissions, storage, content management, and governance.
• Administer user lifecycle, groups, and conditional access in Entra ID (Azure AD).
• Implement security best practices and collaborate with security teams on audits and investigations.
• Develop automation scripts using PowerShell and create runbooks for ops.
• Identify opportunities for service improvements and efficiency.

Skills

Microsoft 365 administration

Exchange Online

Microsoft Teams

SharePoint Online

Microsoft Entra ID (Azure AD)

Security & compliance features

Identity synchronization

Tools

PowerShell

Intune

Purview

Defender

Power Platform

Job description

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:
  • Exchange Online
  • Microsoft Teams
  • SharePoint Online
  • 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.

We're so glad you're here. Use this space to explore career opportunities, track your application, and take next steps with a global team that values people and progress.

Astreya is a global IT managed services provider dedicated to creating technology solutions that are reliable and human-centered. We partner with the world's most innovative organizations to optimize modern IT environments across the digital workplace, cloud, data, AI, and enterprise platforms. Our people are our strength. Across regions and roles, Astreyans bring deep expertise, curiosity, and a commitment to excellence. We believe great technology starts with great humans, which is why we invest in learning, collaboration, and career growth. At Astreya, transparency, accountability, and trust guide how we work with each other and our customers. We foster an inclusive culture where diverse perspectives are valued and everyone has the opportunity to make an impact. Join us to build solutions that matter and shape the future of IT together. Onwards and upwards!