Senior Windows Infrastructure Engineer (Active Directory, M365)

Role: Senior Windows Infrastructure Engineer (Active Directory, M365)

Work Location: Waltham, MA (Onsite/Hybrid) local or can commute candidates only

10/07/2026 to 03/31/2027

Role Summary

Client is seeking a Senior Infrastructure Engineer to provide operational support, administration, troubleshooting, and knowledge transfer for a Microsoft-centric infrastructure environment. The resource will work closely with customer SMEs and support the transition of services from existing providers.

Key Responsibilities

Administer and support Active Directory infrastructure.

Manage user provisioning, group policies, security groups, and access controls.

Provide Microsoft 365 administration and support.

Support Exchange Online mailbox administration.

Perform Windows Server administration, troubleshooting, and break/fix activities.

Manage server health, system performance, and operational incidents.

Support SQL Server environments from an infrastructure perspective.

Collaborate with application owners and business stakeholders.

Assist with infrastructure migrations and transition activities.

Document operational procedures and support knowledge transfer.

Provide onsite support during onboarding and transition phases.

Required Skills

7+ years of Infrastructure Operations experience.

Strong Active Directory administration experience.

Windows Server 2016/2019/2022 administration.

Microsoft 365 Administration.

Exchange Online administration.

Group Policy management.

DNS, DHCP, and Windows networking fundamentals.

VMware or Hyper-V administration.

Incident and problem management experience.

PowerShell scripting.

Preferred Skills

Azure Administration experience.

SQL Server infrastructure support.

Identity and Access Management knowledge.

Experience supporting healthcare or insurance clients.

ITIL Foundation certification.

Soft Skills

Strong communication skills.

Ability to work directly with customer SMEs.

Documentation and knowledge-transfer capabilities.

Ability to work independently in a small-team environment.