Role: Senior Network & Security Infrastructure Engineer
Location: Brussels, Belgium (Hybrid Onsite/Remote)
Contract Type: Full-Time freelance project
🚀 Opportunity Overview
A leading international organisation is seeking an experienced Network & Security Infrastructure Engineer with strong technical expertise to support the design, deployment, and optimisation of large-scale enterprise network environments.
This role is highly technical and not suited for candidates with purely managerial backgrounds. The ideal engineer will be hands-on, highly capable with core networking technologies, and confident in troubleshooting and implementing advanced routing, switching, and security protocols across hybrid infrastructures.
🔧 Key Responsibilities
* Modernise and expand enterprise Wi-Fi infrastructure, including the replacement of legacy access lines and integration of user-friendly authentication systems.
* Evaluate and implement next-gen antenna solutions to improve wireless coverage and performance.
* Support integration efforts between data centre environments across different geographies.
* Configure and transition DHCP/DNS infrastructures and facilitate seamless Active Directory account integrations.
* Drive software-defined network expansion, focusing on advanced datacentre fabric technologies.
* Transition legacy load balancing platforms to virtualised appliances, while optimising traffic within inter-cloud routing environments.
* Introduce enhanced network orchestration and automation tools to align with evolving stakeholder needs.
🧠Technical Skill Requirements
Hands-on experience is mandatory in the following areas:
* Network Topologies: Hierarchical architecture (Core, Distribution, Access), and Leaf-Spine models
* Routing Protocols:
* OSPF (including NSSA, STUB areas)
* IS-IS (Level 1 & 2)
* BGP (Local Preference, AS-Path, MED, Community Strings)
* BGP Address Families: VPNv4, MDT
* Traffic Engineering: Route Redistribution, VLAN/VRF design, MPLS (LDP, L3VPN, Route Distinguishers/Targets)
* Multicast Routing: PIM, MSDP, Rendezvous Point (RP) setup
* SDN & Automation: Cisco ACI, APIC, multipod and multisite deployment, Nexus Dashboard
âś… Profile
* Minimum 8 years’ experience in network engineering, infrastructure, or security roles
* Strong technical acumen in designing and securing enterprise-grade networks
* Able to work independently on complex integration and migration tasks
* Comfortable supporting multi-site or hybrid cloud environments
* Fluent in English and French (verbal and written)
* Degree in Information Technology, Telecommunications, or related discipline preferred