Microsoft System Administrator

Sonata Software

Website: sonata-software.com

Job details:

As an Enterprise Microsoft Administrator, you will play a critical operational role in supporting and maintaining Microsoft 365 and identity platforms at enterprise scale. This role is deeply hands-on and operations-focused, with primary responsibility for administering, troubleshooting, and evolving core Microsoft services including Microsoft Entra ID, Exchange Online, SharePoint Online, Microsoft Teams, and associated security and compliance capabilities.

The ideal candidate brings strong operational discipline and hands-on administration experience, supporting day-to-day platform stability while enabling migrations, integrations, and automation efforts. A strong understanding of identity, authentication, permissions, and Microsoft Graph API application registration models is required.

Key Responsibilities

Microsoft 365 & Identity Operations

• Own day-to-day administration and operational support of Microsoft 365 services.
• Triage, investigate, and resolve operational issues and service requests related to Microsoft 365 and identity services.
• Perform root cause analysis and contribute to long-term remediation and technical debt reduction.

Entra ID & Authentication Administration

• Administer Microsoft Entra ID, including identity lifecycle management, RBAC, and admin role governance.
• Configure and support Conditional Access policies and authentication methods.
• Administer MFA and Microsoft Authenticator, including user enrollment and recovery scenarios.
• Diagnose access and authentication issues using Entra ID sign-in and audit logs.

Exchange Online Administration

• Administer Exchange Online using the admin center and PowerShell.
• Manage mail flow, transport rules, shared and resource mailboxes, and permissions.
• Troubleshoot mail delivery issues and support email security configurations (anti-spam, anti-phishing, SPF, DKIM, DMARC).

Microsoft Graph API & Application Registrations

• Register, configure, and manage applications in Microsoft Entra ID.
• Design and implement Microsoft Graph API access using delegated vs application permissions, including consent models and service principals.
• Ensure secure handling of application secrets, certificates, and least privilege permission assignments.

Migrations & Platform Changes

• Support and execute tenant-to-tenant migrations for Exchange, SharePoint, OneDrive, and Teams.
• Perform post-migration validation, permissions remediation, and integration reconfiguration.

Automation & Continuous Improvement

• Develop and maintain PowerShell automation for Microsoft 365 and identity administration.
• Maintain documentation, runbooks, and operational knowledge bases.
• Support user enablement and adoption related to platform changes.

Qualifications

Required

• 4+ years of hands-on experience administering Microsoft 365 and identity platforms in an enterprise environment.
• Strong operational experience with Microsoft Entra ID and Exchange Online.
• Experience supporting operational workloads and service requests in an enterprise Microsoft environment.
• Hands-on experience registering and managing Entra ID applications and integrating with Microsoft Graph API, including delegated vs application permission models.
• Strong PowerShell scripting skills for Microsoft 365 administration.

Preferred

• Familiarity with Microsoft Intune or endpoint management concepts and their interaction with Conditional Access.
• Experience with Microsoft 365 migration tools such as ShareGate, AvePoint, or Quest Migration Manager.
• Experience supporting large-scale or global enterprise environments.
• Understanding of Power Platform governance concepts, environments, and security considerations in an enterprise setting.
• Familiarity with Microsoft 365 security and compliance capabilities including DLP and eDiscovery.

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