Senior Network Engineer (M/W/X)

The Network Engineer is responsible for the operation, maintenance, optimisation, and evolution of the client corporate network infrastructures, covering LAN, WAN, Cybernet (Wi‑Fi), DMZ/Internet, xDSL, and Remote Access environments. The engineer ensures network performance, security, high availability, scalability, and supports mission\-critical services across all client campuses and datacenters.

Corporate LAN Operations
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• Operate EP's LAN across Brussels, Luxembourg, and Strasbourg.


• Manage hierarchical CORE / DISTRIBUTION / ACCESS Cisco\-based networks.


• Maintain high availability, redundancy, load balancing, and fast convergence mechanisms.


• Support VLANs, ACLs, QoS, jumbo frames, EtherChannel, VSS, MSTP, LACP.


• Manage migrations toward C9500\-XX, C9400, C9300, C9600 series.

Cybernet Network \& Wi‑Fi
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• Operate two large\-scale Wi‑Fi infrastructures (Cisco 98xx \+ Aruba controllers).


• Monitor and optimise \~6500 Access Points across all campuses.


• Support advanced RF management (Cisco RRM / Aruba ARM), multiple SSIDs, WPA2/WPA3, 802\.1x, guest portals, and VxLAN remote AP environments.


• Ensure performance during major political events (\>2000 concurrent users).

WAN / MPLS Network
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• Operate MPLS\-based interconnection between campuses and datacenters.


• Support ASR9K routers, BGP, OSPF, IS‑IS, L3VPN, VPLS, DiffServ QoS, and Traffic Engineering.


• Manage encrypted links over DWDM infrastructures.

Internet Access \& DMZ
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• Support EP's 20Gb/s \+ 5Gb/s Internet access lines.


• Operate protected multi\-zone architectures behind firewalls and proxies.


• Work with anti‑DDoS solutions and Infoblox DNS clusters.

Remote Access
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• Support EP's secure mobility: VPN, Cisco ASA, IronPort, and identity\-based access.


• Manage connectivity for 4000\-5000 simultaneous remote users.


• Support 39 EP Remote Offices.

Tools \& Monitoring
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• Use Cisco Catalyst Center (former DNA Center), Aruba Airwave, Cisco Prime, CA DX Netops, Cisco Nexus Dashboard Insights, Ekahau.


• Operate Netscout TAPs, NGeniusOne, vStream collectors.


• Support OOB network for console access on strategic devices.

Operational Responsibilities
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• Security management and urgent IOS updates.


• Configuration backup/restore, hardware/software upgrades.


• Fault, incident, problem, and change management.


• Performance analysis using advanced monitoring tools.


• Asset and inventory management.


• Maintain IPAM data and manage DNS/DHCP via VitalQIP.


• Coordinate with EP engineering teams and manufacturer TAC.


• Manage Cisco SSM licensing platform.

Experience
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• 7\+ years in complex enterprise network operations.


• Strong experience with Cisco switching/routing, Wi‑Fi, MPLS, BGP, OSPF.


• Experience with large multi\-site environments, high availability, and secure designs.

Key Competencies
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• Cisco Enterprise Networks (C9K family, ASR, ACI basics).


• Wireless Technologies: Cisco 38xx/37xx, Aruba 5xx/6xx.


• MPLS technologies, VPNs, encryption, DWDM links.


• Network security, firewalls, authentication (802\.1x, TACACS\+, RADIUS).


• Monitoring and analysis using Catalyst Center, Airwave, DX Netops, Ekahau.


• Fluent in English (French is an asset)

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