Lead Enterprise Systems Engineer M365

AMBITION GROUP SINGAPORE PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Ambition Group Singapore Pte. Ltd. is seeking a Senior Enterprise Systems Engineer to join our global technology infrastructure team. The role covers both Microsoft 365/cloud and on‑premises infrastructure with hands‑on responsibilities.

The ideal candidate will have 5+ years of enterprise infrastructure experience across M365, Azure/Entra ID, Windows Server, AD and VMware, and will serve as an L3/L4 escalation point and SME.

Qualifications

• Senior hands-on role with deep enterprise infrastructure experience.

Responsibilities

• Design, implement and support enterprise infrastructure across Windows Server, VMware, Azure and Microsoft 365.
• Manage and troubleshoot Active Directory, DNS, DHCP, GPO, DFS, File Services and Exchange.
• Manage Microsoft 365, Entra ID, Exchange Online, Defender and Conditional Access.
• Manage VMware vSphere, Horizon VDI and Azure Virtual Desktop environments.
• Lead resolution of complex P1/P2 incidents, root‑cause analysis and permanent remediation.
• Automate infrastructure operations using PowerShell, Microsoft Graph API and SCCM.
• Support Terraform, Azure DevOps and Infrastructure‑as‑Code initiatives.
• Manage PKI/certificates, security hardening, backup and disaster recovery.
• Act as a technical SME, mentor engineers and contribute to infrastructure architecture and roadmap discussions

Skills

M365 & Azure

Azure/Entra ID

Windows Server

Active Directory

Exchange Online

PowerShell

Microsoft Graph API

SCCM

Terraform

Azure DevOps

PKI & security hardening

Backup & DR

Problem-solving

English communication

Tools

VMware vSphere/Horizon

Azure Virtual Desktop

Terraform

Azure DevOps

SCCM

Job description

The Opportunity

We are looking for a Senior Enterprise Systems Engineer to join a global technology infrastructure team. This is a senior hands‑on role covering both Microsoft 365/cloud and traditional on‑premises infrastructure.

The ideal candidate will have strong experience across M365, Azure/Entra ID, Windows Server, Active Directory and VMware, and be comfortable operating as an L3/L4 escalation point and technical SME.

Key Responsibilities

• Design, implement and support enterprise infrastructure across Windows Server, VMware, Azure and Microsoft 365.
• Manage and troubleshoot Active Directory, DNS, DHCP, GPO, DFS, File Services and Exchange.
• Manage Microsoft 365, Entra ID, Exchange Online, Defender and Conditional Access.
• Manage VMware vSphere, Horizon VDI and Azure Virtual Desktop environments.
• Lead resolution of complex P1/P2 incidents, root‑cause analysis and permanent remediation.
• Automate infrastructure operations using PowerShell, Microsoft Graph API and SCCM.
• Support Terraform, Azure DevOps and Infrastructure‑as‑Code initiatives.
• Manage PKI/certificates, security hardening, backup and disaster recovery.
• Act as a technical SME, mentor engineers and contribute to infrastructure architecture and roadmap discussions

Key Skills & Experience

• At least 5 years of enterprise infrastructure experience, preferably within financial services or a regulated environment.
• Strong hands‑on experience across both M365 and on‑premises infrastructure.
• Strong knowledge of Microsoft 365, Entra ID, Exchange Online, Defender and Conditional Access.
• Strong Windows Server and Active Directory experience.
• Hands‑on VMware vSphere/Horizon experience; Azure Virtual Desktop is advantageous.
• Experience with PowerShell, Microsoft Graph API and SCCM.
• Exposure to Terraform, Azure DevOps, PKI, backup and DR.
• Strong troubleshooting and problem‑solving skills.
• Experience working with global/follow‑the‑sun teams is preferred.
• Excellent English communication skills.