Lead System Administrator

Kerry Consulting; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

Kerry Consulting is seeking a Lead System Administrator in Singapore to manage the on‑premises Exchange environment and Exchange Online, with strong migration ownership. You will work with global teams across IAM and workplace technology to ensure secure, reliable messaging infrastructure while enabling hybrid coexistence and smooth cutovers.

The role requires hands‑on Exchange administration, experience with Entra ID, Azure, and Microsoft 365, and proficiency in PowerShell.

Qualifications

• Hands-on experience administering on-premises Exchange (Exchange 2019 or Subscription Edition) and Exchange Online.
• Experience planning and delivering migrations to Exchange Online / Microsoft 365, including hybrid coexistence and cutover activities.

Responsibilities

• Administer and support on-premises Exchange environment (Exchange 2019/Subscription Edition) and Exchange Online.
• Plan and execute migrations from on-premises Exchange to Exchange Online / Microsoft 365, including hybrid coexistence.
• Support messaging-related activities across Microsoft Entra ID and Azure, including integration with SSO and federation technologies.
• Maintain Windows infrastructure (Windows Server, Active Directory, Group Policy, DNS, DHCP, AD Connect) and automate routine tasks with PowerShell.

Skills

Collaboration

Problem solving

Documentation

Tools

Exchange Server

Exchange Online

Microsoft 365

Azure

Entra ID

PowerShell

Active Directory

DNS/DHCP

AD Connect

SAML/OIDC/OAuth

Job description

A leading global organization in the Financial Services industry is looking for a Lead System Administrator to be based in Singapore. This is a hands-on infrastructure role with a strong focus on Microsoft Exchange Server, Exchange Online, Microsoft 365, Azure, and Entra ID, supporting a secure and reliable enterprise environment. You will work closely with the global teams across infrastructure, IAM, and workplace technology, with particular ownership of Microsoft messaging administration and Exchange migration activities.

Responsibilities

You will administer and support the organization's on-premises Microsoft Exchange environment (Exchange 2019 / Subscription Edition) and Exchange Online, taking responsibility for day-to-day administration, troubleshooting, mail flow, mailbox management, distribution groups, and licensing. A key part of the role will be planning and delivering migrations from on-premises Exchange to Exchange Online / Microsoft 365, including hybrid coexistence and cutover activities.

You will also support messaging-related activities across Microsoft Entra ID and Azure, including integration with SSO and federation technologies such as OIDC, OAuth 2.0, and SAML, while partnering with the relevant IAM and workplace teams. Beyond messaging, you will maintain core Windows infrastructure including Windows Server, Active Directory, Group Policy, DNS, DHCP, and AD Connect, support incident and change management, maintain security and audit readiness, and use PowerShell to automate routine administration.

Requirements

You should bring strong, hands-on experience administering on-premises Microsoft Exchange, ideally Exchange 2019 or Subscription Edition, together with direct experience planning and executing migrations to Exchange Online / Microsoft 365. This should include practical ownership of Exchange administration and migration activities rather than solely providing project or troubleshooting support.

Experience supporting an in-house enterprise IT environment and its end users is important, along with solid knowledge of Microsoft Entra ID, Azure / Azure Stack, Microsoft 365, Windows Server, Active Directory, GPO, DNS/DHCP, AD Connect, and PowerShell. Familiarity with identity and access technologies including Conditional Access, MFA, RBAC/PIM, OIDC, OAuth 2.0, and SAML will also be valuable. You should be comfortable working collaboratively within an established team, taking ownership of operational issues, sharing knowledge, and providing support outside normal business hours or traveling when required by the role.