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 organisation's 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.

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.