Job Purpose
As Senior Windows Infrastructure Engineer, you are the technical anchor for the Windows estate that powers Gresham's managed services platform — a multi-client setting hosted on AWS. The work is grounded in deep Windows Server operations: Active Directory, IIS, hybrid identity, Group Policy, PowerShell, certificate services, and the wider Microsoft ecosystem.

AWS is the platform on which all of this runs. Comfort with the cloud layer matters and you will operate it daily, but it is the Microsoft stack — and its operational nuance — that defines this role. We hire for deep Windows expertise first; the cloud layer is something a strong sysadmin can absorb.

The estate is Windows Server 2019 and above, end-to-end. Linux footprint is negligible — this is a role for someone who wants to go deep on the Microsoft stack rather than be spread thin across platforms.

This is a 100% individual contributor role. You will not manage or lead a team. You will own complex incidents end-to-end, set technical standards by example,



and act as the senior escalation point for the Cloud Support function. You will be working US hours so please only apply if you are able to do so.

Role Responsibilities
* Lead resolution of complex Windows Server incidents across multi-client, AWS-hosted environments — from triage to root cause to remediation.
* Administer and harden Windows Server 2019/2022/2025: Active Directory (forest/domain design, replication, FSMO, GPOs, trusts), DNS, DHCP, IIS, WSUS, AD CS, file & print services.
* Operate hybrid identity: AD on-prem ↔ AWS Managed Microsoft AD, federation with Entra ID (Azure AD) / AD FS, SAML / OIDC / OAuth, Kerberos, MFA.
* Author and maintain PowerShell automation: bulk administration, scheduled tasks, configuration drift correction, reporting, and DSC where appropriate.
* Operate the AWS hosting layer for Windows workloads: EC2, EBS, VPC, IAM, Route 53, CloudWatch, Systems Manager (Patch Manager, Session Manager, Run Command),

📌 Cloud Windows Infrastructure Engineer (India)
🏢 Gresham
📍 India