Cloud Infrastructure Engineer; Exchange Online & Microsoft 365
Singapore
Listed on 2026-10-14
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IT/Tech
Cybersecurity, M365, SharePoint & Power Platform
Assurity Trusted Solutions (ATS) is a wholly owned subsidiary of the Government Technology Agency (Gov Tech).As a Trusted Partner over the last decade. ATS offers a comprehensive suite of products and services ranging from infrastructure and operational services, governance and assurance services as well as managed processes. In a dynamic digital & cyber landscape where trust & collaboration is key, ATS continues to drive mutually beneficial business outcomes through collaboration with Gov Tech, government agencies and commercial partners to mitigate cyber risks and bolster security postures.
We are seeking for a Cloud Infrastructure Engineer (Exchange Online & Microsoft 365) to join our team.
Cloud Infrastructure Engineer (Exchange Online & Microsoft 365)We are seeking a highly motivated Cloud Infrastructure Engineer to support the design, administration, security, governance, and operations of Microsoft 365 services, with a primary focus on Exchange Online and Microsoft Entra .
The role is responsible for ensuring secure, resilient, and scalable collaboration, messaging, identity, and productivity services across the organisation. The engineer will work closely with product principals, outsourced service providers, vendors, and stakeholders to drive service delivery, technology refresh, cloud transformation, security compliance, and operational excellence.
Key Responsibilities Microsoft 365 & Exchange Online Administration- Administer and support Microsoft 365 services, including Exchange Online, Microsoft Teams, SharePoint Online, One Drive, Microsoft Entra , Intune, Viva, Dynamics 365, Power BI, Power Automate, and Power Platform.
- Manage Exchange Online environments, including mailbox administration, mail flow, transport rules, connectors, distribution groups, Microsoft 365 Groups, message tracing, SMTP relay, and hybrid deployments.
- Lead or support Exchange Hybrid, mailbox migration, tenant-to-tenant migration, and technology refresh initiatives.
- Manage service health monitoring, tenant administration, licensing, user lifecycle management, and Microsoft 365 operational support.
- Administer Microsoft Entra , including identity lifecycle management, hybrid identity, Entra Connect, SSO, MFA, Conditional Access, Privileged Identity Management (PIM), and identity governance.
- Support synchronisation between on-premises Active Directory and Microsoft Entra , federation services, and hybrid identity architectures.
- Implement identity security controls aligned with Microsoft and industry best practices, including password protection, privileged access controls, and phishing-resistant authentication.
- Implement and maintain Microsoft Defender for Office 365, Microsoft Purview, information protection, retention policies, eDiscovery, audit logging, anti-phishing controls, and email security policies.
- Manage SPF, DKIM, DMARC, Safe Links, Safe Attachments, Exchange Online Protection (EOP), DLP, and security monitoring capabilities.
- Ensure operational processes comply with security, governance, risk, compliance, and organisational policies.
- Support audits, security assessments, investigations, access reviews, and compliance reporting activities.
- Develop and maintain Power Shell and Microsoft Graph automation for provisioning, reporting, configuration management, and operational support.
- Automate operational processes and reporting to improve efficiency, accuracy, and service reliability.
- Prepare and maintain technical documentation, architecture diagrams, operational procedures, and knowledge articles.
- Support administration and governance of Microsoft Teams, SharePoint Online, One Drive, and…
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