Senior Network Engineer LAN - Brussels - Freelance

Senior Network Engineer LAN

Type of contract: Freelance

Length: Long term, 1 year contract + extensions

Location: Brussels, onsite

Responsibilities

• Design, implement, and manage large-scale TCP/IP networks (>1,000 nodes) using CWDM, QoS, UTP, and fiber optic cabling.
• Administer CISCO and Nexus application switches across complex infrastructures.
• Manage Fortinet and CISCO firewall systems, SSL offloading devices, and encryption technologies.
• Support telecommunication protocols (VoIP, H.232) and ensure communication security.
• Monitor network performance using management, debugging, and load balancing tools (F5 ADCs).
• Oversee DHCP/DNS systems using Infoblox, Trinzic 825, and Network Services One/Grid.
• Perform structural cabling, fiber installations, and Ethernet switching/routing.
• Apply ITIL processes for change, incident, and configuration management.
• Lead network-level disaster recovery and ensure high availability across multiple sites.
• Support proxy servers, crypto devices, and secure dial-in systems with authentication/encryption.
• Manage network-related projects with a focus on security and scalability.
• Communicate fluently in English (C1 CEFR); French is highly desirable.
• Ensure compliance with network security protocols and maintain active security clearance.

Profile Requirements

• Valid Security Clearance (mandatory).
• Degree in Computer Science (4 years) + 10 years of IT engineering experience
• Or: 2 additional years of experience per missing academic year.
• CCNA Routing & Switching (minimum); CCNP or other advanced certifications preferred.
• Desirable: CCNA Data Centre, CCNA Cyber Ops, or similar.
• 10 years: TCP/IP networks, CWDM, QoS, Ethernet switching, cabling, fiber installations, network monitoring.
• 8 years: CISCO & Nexus switch administration.
• 5 years: Fortinet/CISCO firewalls, SSL offloading, encryption, VoIP/H.232, ITIL, F5 ADCs, Infoblox, proxy servers.
• 3 years (desirable): Project management, disaster recovery, multi-site network environments, crypto devices.
• 1 year: Dial-in systems with secure authentication/encryption.
• Excellent English (C1); French is a strong asset.