Senior Network Engineer (M/W/X)
Publiée le 27/05/2026
CTG IT Solutions
- Bertrange
- Informatique Consulting
- Informatique Infrastructure / Système / Réseau
- Entre 6k et 7k € / mois
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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- 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)