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Infrastructure Engineer (Windows & Cloud)
Islandwide, Singapore
ContractInformation TechnologyJob 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