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Infrastructure Engineer (Windows & Cloud)

Islandwide, Singapore
ContractInformation Technology

Job Description

A.    Windows Server Administration  (Primary)

  • Administer and maintain Windows Server environments including security and performance monitoring.
  • Manage server provisioning, decommissioning, and lifecycle activities in alignment with change management policies.
  • Troubleshoot system-level issues, review event logs, and perform root-cause analysis for recurring incidents.
  • Maintain system hardening standards and ensure compliance with security policies and audit requirements.
  • Coordinate scheduled maintenance windows including patching cycles, restarts, and capacity adjustments.

B.  Active Directory & Identity Services  (Primary)

  • Administer and maintain Active Directory Domain Services (AD DS) including user and group management, Group Policy Objects (GPOs), Organizational Units (OUs), and trust relationships.
  • Support DNS and AD-integrated services to ensure directory health and name resolution continuity.
  • Conduct periodic AD health checks, replication monitoring, and audits of privileged access accounts.
  • Collaborate with the security team to enforce least-privilege access principles and manage privileged identity workflows (e.g., CyberArk or equivalent PAM tools).
  • Support onboarding and off boarding processes by executing access provisioning and de-provisioning in accordance with approved procedures.

C.  Cloud Platform Operations — Azure &AWS  (Primary)

  • Perform day-to-day operational management of cloud resources including Virtual Machines, storage accounts, virtual networks, and IAM roles/policies.
  • Monitor cloud workload health using native platform tools (Azure Monitor, AWS CloudWatch) and escalate anomalies per defined SLAs.
  • Manage cloud resource tagging, cost visibility reporting, and contribute to FinOps practices to prevent cloud spend overruns.
  • Apply cloud security baseline configurations
  • Participate in cloud migration and onboarding activities, including infrastructure readiness assessments and post-migration validation.

D.  Infrastructure as Code (IaC) 

  • Maintain and update existing Terraform templates for infrastructure provisioning.
  • Perform modifications to IaC scripts under the guidance of senior engineers or architects, including variable updates, module adjustments, and plan/apply cycles.
  • Maintain version control disciplines to align best security practices.
  • Participate in infrastructure drift detection and remediation activities to ensure deployed resources match approved configurations.

Overall Experience

  • 4–7 years for Windows Server and Active Directory administration.
  • 2–4 years of operational cloud experience across Azure and/or AWS.
  • Demonstrated ability to independently manage operational tasks with minimal supervision.
  • Windows Server 2016/ 2019 / 2022 administration
  • OS patching via WSUS or Microsoft Update Management
  • Performance monitoring: Task Manager, PerfMon, Resource Monitor
  • Server roles: IIS, File Services, DNS, DHCP
  • Event Log analysis and incident triage
  • Local and domain Group Policy configuration
  • Minimum 4 years of hands-on experience in IT infrastructure operations.
  • Proven track record in a hybrid environment (on premises + cloud).
  • Experience in a structured IT operations team, ideally within government, statutory board, or large enterprise.
  • AD DS: Users, Groups, OUs, GPO management
  • AD replication, FSMO roles, and site topology awareness
  • DNS and DHCP within AD-integrated environments
  • AD health and audit tools (DCDiag, Repadmin, ADSIEdit)
  • Privileged Access Management (PAM) concepts; CyberArk exposure is an advantage

(IaC / Automation)

  • 1–3 years of exposure to Terraform or equivalent IaC tooling.
  • Ability to read, understand, and make guided modifications to existing IaC code.
  • Practical PowerShell scripting experience of at least 2–3 years.

About Optimum Solutions (Singapore) Pte Ltd

First seen: May 20, 2026
Last updated: May 29, 2026