Senior Infrastructure Administrator (m/w/d)

Job Description

The Senior Infrastructure Engineer is responsible for the design, implementation, administration, and continuous improvement of the company’s IT infrastructure.

This role ensures the availability, security, and performance of server and cloud environments, supporting the operational needs of a telecom and networking organization.

The position covers Windows and Linux servers, virtualization platforms, networking, and Microsoft 365 services (SharePoint, Microsoft Entra ID, and Microsoft Teams).

Approximately 15% of the role is dedicated to Level 2 support , assisting the Service Desk with infrastructure-related incidents. The role also requires the ability to drive activities in project mode and actively contribute to infrastructure initiatives.

Key Responsibilities

Infrastructure Administration

• Manage and maintain Windows Server and Linux environments
• Administer and monitor virtualization platforms (VMware, Proxmox, or equivalent)
• Ensure system availability, performance, patching, and lifecycle management
• Manage backup, monitoring, and disaster recovery processes (e.g., Veeam)
• Maintain certificate management and enforce security standards
• Manage network infrastructure ( LAN, WLAN, user VPNs )

Cloud & Collaboration Platforms

• Administer Microsoft 365 services , including: • SharePoint Online
• Microsoft Teams
• Microsoft Entra ID

• Manage Identity & Access Management and related security controls
• Support integration between on-premises infrastructure and cloud platforms
• Administer Mobile Device Management (MDM) solutions (e.g., Intune)
• Manage container environments (e.g., Docker)

Infrastructure Projects

• Contribute to the design and implementation of infrastructure projects
• Participate in cloud adoption and infrastructure modernization initiatives
• Prepare and maintain technical and architectural documentation
• Coordinate with other ICT teams for infrastructure deployments and changes

Operational Support

• Provide Level 2 support (~15% of workload) for infrastructure-related incidents
• Assist the Service Desk with incident resolution and root cause analysis
• Contribute to continuous improvement of infrastructure operations
• Ensure daily backup and availability checks

Qualifications

Technical Skills

• Strong expertise in Windows Server administration (including Active Directory)
• Strong expertise in Linux system administration
• Experience with virtualization platforms (VMware, Proxmox)
• Knowledge of the Microsoft 365 ecosystem (SharePoint, Teams, Entra ID)
• Understanding of identity management, security practices, and certificate management
• Experience with scripting and automation (PowerShell, Python)
• Knowledge of storage systems (SAN, NAS)

Professional Skills

• Strong problem-solving and troubleshooting skills
• Ability to work effectively in remote and international teams
• Experience in managing and driving infrastructure projects
• Strong documentation and communication skills
• Ability to collaborate within cross-functional IT teams
• Proactive, autonomous, and curious mindset

Experience and Education

• Degree in Computer Science, Information Systems, or a related field (or equivalent experience)
• Minimum of 5 years’ experience in system administration or infrastructure engineering
• Experience in enterprise or telecom environments is a plus

Languages

• Fluent in English
• Good command of Dutch (Flemish)
• Knowledge of French is an asset

Additional Information

All our positions are open to both women and men and are, of course, open to people with disabilities.