Senior System Design Engineer (Network & Security) - Mechelen - Freelance / CDI

Key Responsibilities

• Analyse business and technical requirements and translate them into robust system designs
• Evaluate design options, trade‑offs, and benefits, ensuring alignment with enterprise standards
• Validate design compliance and support deployment to ensure requirements are fully met
• Design and optimise systems with focus on performance, capacity, availability, and scalability
• Contribute to technology evolution and continuous improvement initiatives
• Perform complex incident resolution and root cause analysis
• Maintain and update technical documentation
• Participate in on‑call rotations for the systems under your responsibility (when required)

Technical Scope

WAN & Security

• Fortinet technologies (FortiGate, FortiManager)
• SD‑WAN architectures
• BGP routing
• IPsec VPN technologies
• Firewall policy design and management
• Advanced troubleshooting and debugging

LAN

• HPE Aruba switching
• Cisco enterprise switching
• Core switching environments
• Aruba Central (on‑prem)
• VLANs, routing, redundancy and high availability

Wireless

• Aruba Access Points
• Aruba AirWave
• Enterprise Wi‑Fi design, optimisation and troubleshooting

General Networking

• Strong understanding of TCP/IP, routing and switching fundamentals
• Experience with enterprise monitoring and logging
• Knowledge of failover and high‑availability architectures