Senior Windows Infrastructure Engineer (L3)

CORNERSTONE GLOBAL PARTNERS PTE. LTD.; Singapore; On-site; SGD 60,000 - 90,000; Full time

Job summary

Cornerstone Global Partners is seeking an experienced L3 infrastructure support engineer to manage Windows Server and AD environments, virtualisation platforms, and hybrid identity services. You will handle 24x7 operations, on-call rotations, patching, and DR planning while driving automation via PowerShell, Ansible and Terraform.

The role requires strong incident and change management skills, +AD Entra ID governance, and collaboration with cross-functional teams to ensure security and

Qualifications

• Windows Server 2016/2019/2022 administration experience.
• Active Directory, DNS, DHCP, DFS, GPO, ADFS, RDS experience.
• VMware ESXi/vCenter with HA/DRS/vMotion experience.
• Nutanix Prism/AHV/CVM/Lifecycle management expertise.
• SCCM, BigFix, Datadog and Grafana experience.
• AD Manager Plus and QuestRecovery Manager familiarity.
• Automation scripting with PowerShell and Python; IaC with Terraform/Ansible.

Responsibilities

• Provide L3 support for Windows, virtualization, and identity services.
• Manage AD/Entra ID operations, CA, RBAC and access reviews.
• Lead incident, problem and change management activities.
• Conduct RCAs, KEDB updates, and DR planning/exercises.
• Maintain runbooks, SOPs and documentation for run environments.

Skills

Windows Administration

Active Directory Administration

Incident & Change Management

24x7 Operations & On-call

DR Planning & Execution

Capacity & Performance Management

RBAC Administration

Security & Compliance Audits

Education

Microsoft Windows Server Hybrid Administrator

Microsoft Identity and Access Administrator

VMware VCP/VCAP

Nutanix NCP

Red Hat Ansible Automation

Hashicorp Terraform Associate

ITIL Foundation

Tools

VMware ESXi/vCenter

Nutanix Prism/AHV/CVM

SCCM / BigFix

Datadog / Grafana

PowerShell

Python

Ansible Automation Platform

Terraform

QuestRecovery Manager / AD Manager Plus

Job description

Provide L3 support for enterprise Windows infrastructure, VMware, Nutanix, Active Directory and Hybrid Identity services in a 24x7 managed services environment.

Support Coverage

24x7 operational support, shift rotation, on-call support, major incident management, SLA compliance and DR activities.

Technical Requirements

• Windows Server 2016/2019/2022 Administration
• Active Directory, DNS, DHCP,DFS, GPO, ADFS, KMS, RDS
• VMware ESXi, vCenter, HA, DRS,vMotion
• Nutanix Prism, AHV, CVM, LCM
• SCCM, BigFix, Datadog, Grafana
• AD Manager Plus and QuestRecovery Manager

AD and Entra ID Responsibilities

• Azure AD / Entra ID Operations
• Conditional Access Administration
• Identity Governance
• RBAC Administration
• Access Certification Reviews
• Entra Connect Management
• AD Recovery using QuestRecovery Manager
• AD Manager Plus Administration
• Security and Compliance Audits
• Hybrid Identity Management
• Certificate Lifecycle Management

Automation Skills

• Ansible Automation Platform
• Terraform Infrastructure as Code
• PowerShell Automation
• Python Scripting
• Workflow Automation
• Reusable Playbooks and IaC Modules

Operational Responsibilities

• Incident, Problem and Change Management
• RCA and KEDB Management
• Patching and Vulnerability Remediation
• Lifecycle Management and EOL/EOS Tracking
• Capacity and Performance Management
• DR Planning and Execution
• OEM Coordination
• Documentation, SOP and Runbook Maintenance

Preferred Certifications

• Microsoft Windows Server Hybrid Administrator
• Microsoft Identity and Access Administrator
• VMware VCP/VCAP
• Nutansix NCP
• Red Hat Ansible Automation
• Hashicorp Terraform Associate
• ITIL Foundation

Cornerstone Global Partners (EA License Number: 19C9859) is an affirmative equal-opportunity employer and recruitment firm. We evaluate qualified applicants without regard to race, colour, religion, creed, gender, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class.