Global System Administrator

Position Summary

We are seeking an experienced and hands-on Global System Administrator to join our Singapore team. The ideal candidate brings a minimum of 10 years of experience managing complex multi-system IT environments with a strong focus on Windows Server infrastructure. You will be responsible for the installation upgrade configuration administration and maintenance of a broad range of systems and appliances while managing projects end-to-end including professional services coordination handovers and documentation.

Key Responsibilities:

Infrastructure & Virtualisation

• Administer and manage 100 virtual servers running Windows Server 2019 and 2025.
• Manage VMware vCenter and ESXi environments including automation via PowerCLI and vRealize Orchestrator.
• Maintain NetApp MetroCluster SAN storage including NFS/CIFS and MPIO configurations.
• Support and manage Data Centre operations including rack management capacity planning and hardware lifecycle.

Backup & Disaster Recovery

• Manage enterprise backups using Veeam Backup & Replication including scheduling monitoring and recovery testing.
• Maintain and regularly test Disaster Recovery (DR) runbooks and failover procedures.

Patch & Endpoint Management

• Deploy and manage Microsoft patches service packs and feature releases via Microsoft Endpoint Configuration Manager (MECM) and Microsoft Intune.
• Manage device lifecycle and compliance via AirWatch (Workspace ONE) and Intune co-management policies.

Directory Identity & Access Management

• Administer Active Directory Domain Services DNS DHCP LDAP and Group Policy.
• Manage Azure Entra ID (formerly Azure AD) including hybrid identity Conditional Access policies MFA enforcement and Privileged Identity Management (PIM).
• Support Zero Trust security principles across identity and access management.

Messaging & Collaboration Systems

• Administer Microsoft Exchange Server 2019 SE (on-premises physical) covering global rules transport policies monitoring scripting upgrades and capacity sizing.
• Maintain a strong working knowledge of messaging fundamentals: MX/SPF/DKIM/DMARC records S/MIME signatures and email encryption.
• Support and administer Microsoft 365 collaboration tools including Teams SharePoint Online and Exchange Online.

Cloud & Hybrid Infrastructure

• Manage and optimise the organisations hybrid cloud environment spanning on-premises infrastructure and Microsoft Azure.
• Support cloud governance cost management and security posture across Azure subscriptions.
• Assist with workload migrations from on-premises to cloud where applicable.

Automation Scripting & AI

• Automate repetitive tasks and improve operational efficiency using PowerShell Python and modern DevOps tooling.
• Leverage AI-assisted automation (including Microsoft Copilot Power Automate and AI agents) to deploy workers for routine operational tasks.
• Develop and maintain internal runbooks automation scripts and infrastructure-as-code (IaC) templates.

Security & Compliance

• Apply and maintain security hardening standards across Windows Server Active Directory and cloud environments.
• Collaborate with the security team to support vulnerability management patching cadence and audit readiness.
• Enforce and review Group Policy and Intune compliance policies to meet internal and regulatory standards.

Monitoring & Observability

• Administer monitoring platforms (e.g. Centreon Zabbix or equivalent) to ensure proactive detection of infrastructure issues.
• Define and maintain alerting thresholds dashboards and escalation workflows.

Citrix & Virtual Desktop

• Administer and support Citrix Virtual Apps and Desktops (CVAD) farm environments including application publishing session management and performance tuning.

Project & Documentation Management

• Lead infrastructure projects from initiation through to delivery including vendor and professional services coordination.
• Maintain accurate and up-to-date technical documentation SOPs handover notes and runbooks.

Qualifications :

Operating Systems

• Windows Server 2019 & 2025 administration

Virtualisation

• VMware ESXi & vCenter
• PowerCLI and vRealize Orchestrator scripting

Storage

• NetApp SAN (MetroCluster)
• NFS/CIFS MPIO

Backup & DR

• Veeam Backup & Replication

Directory Services

• Active Directory Domain Services
• DNS DHCP LDAP Group Policy

Messaging

• Exchange Server 2019 SE strong experience required
• Microsoft 365 Exchange Online

Cloud

• Microsoft Azure
• Azure Entra ID
• Office 365 / Microsoft 365 Administration

Endpoint Management

• Citrix Virtual Apps and Desktops (CVAD)
• AirWatch / Workspace ONE
• Microsoft Intune / MECM

Monitoring

• Centreon Zabbix or equivalent tools

Networking

• DMZ load balancing VLANs firewalls
• PaloAlto firewall knowledge advantageous

Scripting & Automation

• PowerShell Python
• AI-assisted automation (Copilot Power Automate AI agents)

Personal Attributes

• Honest trustworthy and flexible in approach.
• Excellent verbal and written communication skills.
• Proven ability to work independently and collaboratively under pressure with shifting priorities.
• Highly responsive energetic and proactive.
• Self-motivated with a strong sense of ownership accountability and the ability to meet deadlines.
• Creative problem-solver with a resourceful mindset.
• Strong team player with an open non-political style and high personal integrity.
• Willingness to work outside normal business hours and travel when required.

Remote Work :

No

Employment Type :

Full-time