Senior Microsoft 365 Administrator

Wilson Sonsini•Washington, DC

3d•$119,000 - $178,250•Remote

About The Position

Wilson Sonsini is seeking a Senior Microsoft 365 Administrator to keep the firm’s Microsoft 365 environment secure, reliable, and evolving. The role will lead migrations of key services into Microsoft 365, maintain alignment with firm security and risk standards, and partner with IT Operations, Security, Risk, Applications, and Communications to support attorneys, practice groups, and administrative teams. This is a fully remote opportunity. The administrator will manage Exchange Online, Mimecast email security policies, and the firm’s email archiving solution; administer Entra ID and hybrid identity; support mobile device management and migration from AirWatch to Intune; and support Teams, SharePoint, OneDrive, and conferencing equipment. The role will also support Purview and Defender implementations, investigate cloud performance issues, document managed services, and share Microsoft 365 knowledge with IT engineers and developers. The position requires 7 or more years of Microsoft 365 administration or comparable experience, including hands-on administration across core Microsoft 365 services and at least 3 years administering Entra ID and hybrid identity. The administrator should collaborate effectively, communicate with technical and non-technical audiences, manage multiple projects, handle confidential information discreetly, and be available for 24/7 support when critical issues arise. Preferred qualifications include a bachelor’s degree, legal-industry experience, relevant Microsoft certifications, migration and automation experience, identity governance and protection experience, familiarity with AI tools, and AV/conferencing support experience. The anticipated annual base pay is $131,750–$178,250 in Palo Alto, New York, and San Francisco; and $119,000–$161,000 in Austin, Boston, Boulder, Century City, Delaware, Los Angeles, Salt Lake City, San Diego, Seattle, Washington, D.C., and other locations. Compensation may include a discretionary year-end merit bonus based on performance. The firm offers a competitive salary and benefits package; further benefits information is available via the posting’s benefits link.

Requirements

7 or more years as a Microsoft 365 Administrator, or comparable experience.
Hands-on administration of Exchange Online, Teams, SharePoint Online, Purview, Copilot, OneDrive, and Intune.
3 or more years administering Entra ID (formerly Azure AD), including hybrid identity with Entra Connect.
Working knowledge of Conditional Access, MFA, and SSO (SAML/OIDC).
Experience with email security and mail gateway policy management.
Experience troubleshooting authentication and access issues across Exchange Online, Teams, OneDrive, and Intune.
Understanding of Microsoft 365 integrations using Graph API.
Spot problems early and bring solutions.
Collaborate across IT and explain information clearly to engineers and non-technical audiences.
Keep multiple projects moving at once.
Handle confidential information with discretion.
Availability for 24/7 support when critical issues arise.

Nice To Haves

Bachelor of Arts degree.
Experience in the legal industry.
Microsoft 365 certification, such as Administrator Expert (MS-102), or SC-300.
Experience migrating MDM platforms, such as AirWatch to Intune.
PowerShell or Graph automation for Microsoft 365 and identity.
Entra ID Governance experience, including Privileged Identity Management, access reviews, and entitlement management.
Identity protection, risk-based policies, and sign-in log analysis experience.
Experience with AI tools such as Copilot or Claude.
Experience supporting AV and conferencing equipment.

Responsibilities

Administer Exchange Online.
Manage Mimecast policies and configuration for spam, malware, and other threats.
Help manage the firm’s email archiving solution.
Administer Entra ID, including user and group lifecycle, licensing, and device registration.
Manage and troubleshoot hybrid identity, including Entra Connect synchronization with on-premises Active Directory.
Manage enterprise apps, app registrations, and B2B guest access, and support periodic access reviews.
Support mobile devices on AirWatch and help migrate to Intune.
Support Teams, SharePoint, and OneDrive.
Work with Communications on AV conferencing equipment.
Support Purview and Defender implementations alongside IT Security and Risk.
Perform root cause analysis on cloud performance issues to restore service quickly and prevent recurring problems.
Document the services managed.
Stay current on Microsoft 365 developments and share knowledge with IT engineers and developers.
Lead migration of key services into Microsoft 365 and keep tenants aligned with firm security and risk standards.
Partner with IT Operations, Security, Risk, Applications, and Communications to support attorneys, practice groups, and administrative teams.
Be available for 24/7 support when critical issues arise.