Senior Microsoft 365 Platform Engineer

Repligen Corporation•Waltham, MA

About The Position

The Senior Microsoft 365 Platform Engineer leads the engineering, administration, governance, security, and continuous improvement of the global Microsoft 365 platform. The role serves as the technical lead for Microsoft 365 collaboration, SharePoint Online, Identity & Access Management (IAM), Entra ID, and endpoint management services, delivering secure, scalable, and reliable digital workplace solutions across the enterprise. The role owns Microsoft 365 services and acts as a Tier 3 escalation point and technical authority. It designs and implements solutions aligned with enterprise architecture and security standards; manages identity, access, and endpoint capabilities; automates operations; monitors platform health, security, adoption, and compliance; and partners with Cybersecurity teams. It also supports incident response and service improvement, maintains technical documentation and operational procedures, and evaluates and leads adoption of new Microsoft technologies and capabilities.

Requirements

Bachelor's degree in Information Technology, Computer Science, or a related field, or equivalent experience.
At least 7 years of hands-on Microsoft 365 administration and engineering experience in a medium-to-large enterprise.
Deep expertise in Microsoft 365 administration, SharePoint Online administration and governance, Microsoft Teams, Exchange Online, OneDrive for Business, Microsoft Entra ID (Azure AD), IAM, and Microsoft Intune.
Strong experience with Hybrid Active Directory and Entra ID environments.
Expertise implementing and managing SSO, MFA, Conditional Access, RBAC, PIM, and Identity Governance.
Strong PowerShell scripting and Microsoft Graph automation experience.
Experience supporting endpoint management, Windows Autopilot, and modern device management.
Strong understanding of Microsoft 365 security, compliance, governance, and collaboration technologies.
Experience supporting global organizations and geographically distributed teams.

Nice To Haves

Experience with Microsoft Defender, Purview, ServiceNow, and ITIL processes.
Microsoft 365 Certified: Enterprise Administrator Expert (MS-102).
Microsoft Certified: Identity and Access Administrator Associate (SC-300).
Microsoft Certified: Endpoint Administrator Associate (MD-102).
Microsoft Certified: Cybersecurity Architect Expert (SC-100).

Responsibilities

Administer, support, govern, and continuously improve Microsoft 365 services, including SharePoint Online, Teams, Exchange Online, OneDrive, Entra ID, and Intune.
Serve as the Tier 3 escalation point and technical authority for Microsoft 365 platform issues and initiatives.
Design and implement secure, scalable Microsoft 365 solutions aligned with enterprise architecture and security standards.
Lead SharePoint governance, permissions management, site lifecycle management, collaboration standards, and migration initiatives.
Administer and enhance IAM capabilities, including Hybrid Identity, SSO, MFA, Conditional Access, PIM, and Identity Governance.
Support enterprise application integrations using SAML, OAuth, OpenID Connect, and SCIM.
Manage endpoint solutions through Microsoft Intune and Windows Autopilot, including device provisioning, compliance, application deployment, and endpoint security.
Develop automation and operational improvements using PowerShell and Microsoft Graph.
Monitor platform health, performance, security posture, adoption, and compliance metrics.
Partner with Cybersecurity teams to implement Microsoft 365 security, compliance, and governance controls.
Participate in incident response, root cause analysis, and continuous service improvement activities.
Create and maintain architecture documentation, standards, runbooks, and operational procedures.
Evaluate Microsoft roadmap enhancements and lead adoption of new technologies and platform capabilities.