Senior Windows System Administrator

Location: Brussels Belgium (Hybrid)
Contract Duration: 1 July 2026 31 January 2027
Workload: Full-time (100%)
Remote Work: Hybrid working available

About the Role

We are seeking an experienced Senior Windows System Administrator to join a Windows Server Team responsible for maintaining and supporting a large-scale enterprise IT infrastructure.

In this role you will be responsible for managing Windows-based systems supporting critical business services resolving complex incidents and contributing to the ongoing maintenance and optimization of the server environment. You will work across a broad range of Microsoft technologies while ensuring the stability security and performance of the organizations infrastructure.

Key Responsibilities

• Provide 2nd and 3rd line support for infrastructure-related incidents and service requests.
• Administer and maintain Windows Server environments.
• Implement and support infrastructure changes and service enhancements.
• Perform application deployments and line-of-business releases on application servers.
• Maintain and support Citrix environments and Remote Desktop Services.
• Monitor troubleshoot and optimize Windows infrastructure services.
• Support Microsoft 365 services including authentication Teams and Exchange Online.
• Contribute to system upgrades maintenance activities and operational improvements.
• Create and maintain technical documentation and operational procedures.

Required Skills & Experience

Must-Have

• Minimum 5 years of experience as a Windows System Administrator.
• Minimum 5 years of hands-on experience with Microsoft Active Directory and Group Policies.
• Minimum 5 years of experience with Windows Server 2016 or later.
• Minimum 5 years of experience with Windows Infrastructure Services including:
  • DHCP
  • DNS
  • PXE
  • Windows Firewall Technologies
• Minimum 2 years of experience with Microsoft 365 technologies including:
  • Exchange Online
  • Microsoft Teams
  • Authentication Services
• Strong systems engineering knowledge within Windows environments.
• Fluent Dutch language skills (CEFR C2 level).

Preferred Skills

Experience with one or more of the following technologies is highly desirable:

• Windows PowerShell
• Microsoft IIS Application Servers
• Microsoft Endpoint Manager (Intune)
• Microsoft Exchange Server 2019
• Office 365 SharePoint Online
• Office 365 Security & Compliance
• Microsoft System Center Configuration Manager (SCCM)
• Microsoft System Center Operations Manager (SCOM)
• Microsoft SQL Server
• Microsoft Failover Clustering
• Microsoft Storage Spaces Direct
• Microsoft Just Enough Administration (JEA)
• PowerShell Desired State Configuration (DSC)
• VMware vSphere
• Citrix Virtual Apps and Desktops
• Citrix NetScaler
• Citrix Hypervisor (XenServer)
• CommVault Backup Solutions
• SharePoint Server
• Tibco Spotfire Server
• UniPrint Infinity Suite
• MSIX Packaging
• Windows Installer XML (WiX)

Additional Knowledge

• Experience with enterprise infrastructure solutions.
• Understanding of ITIL processes particularly Change Management.
• Experience working in complex production environments with high availability requirements.

What Youll Bring

You are a proactive and technically strong infrastructure professional with extensive experience in Windows Server administration and enterprise Microsoft technologies. You enjoy troubleshooting complex issues supporting critical systems and working within a collaborative operations team to ensure a stable and secure IT environment.

This role is ideal for a senior systems administrator looking to contribute to a large-scale and diverse infrastructure landscape.

Interested

If you have extensive Windows Server administration experience and a strong background in Microsoft infrastructure technologies we would love to hear from you.

Application Closing Date: 18 June 2026