Global System Administrator

Vitol; Singapore; On-site; SGD 100,000 - 130,000; Full time

Job summary

Vitol is seeking an experienced Global System Administrator in Singapore. The role demands at least 10 years of experience in IT management, focusing on Windows Server infrastructure and VMware environments. Responsibilities include managing virtual servers, ensuring data security, handling backup and recovery processes, and supporting Microsoft Exchange. Ideal candidates should demonstrate strong technical skills and personal attributes like integrity and the ability to work under pressure.

Qualifications

• Minimum of 10 years experience managing complex IT environments.
• Hands-on experience with Windows Server infrastructure.
• Strong understanding of security and compliance practices.

Responsibilities

• Manage and administer over 100 virtual servers.
• Ensure data backup and disaster recovery processes are effective.
• Administer Microsoft Exchange and manage email security.

Skills

Windows Server 2019 & 2025 administration

VMware ESXi & vCenter

PowerShell

Python

Exchange Server 2019 SE

Veeam Backup & Replication

Active Directory Domain Services

Cloud (Office 365 / Microsoft 365)

Monitoring tools (Centreon, Zabbix)

Citrix Virtual Apps and Desktops

Job description

Job Description

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

• 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.
• 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.
• 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.
• 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.

Qualifications

Operating Systems

• Windows Server 2019 & 2025 administration
• VMware ESXi & vCenter
• PowerCLI and vRealize Orchestrator scripting

Storage

• 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

• Office 365 / Microsoft 365 Administration
• Citrix Virtual Apps and Desktops (CVAD)
• AirWatch / Workspace ONE

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.