Network & Security Engineer

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Network & Security Engineer

Publiée le 12/01/2026

Proximus Luxembourg

• Bertrange
• Informatique Consulting
• Informatique Infrastructure / Système / Réseau

Temps de travail

Temps plein

Type de contrat

CDI

Langues parlées

EN

Niveau d'étude

Bachelor / Licence

Master

About Proximus Luxembourg
Proximus Luxembourg is a leading historical player in the ICT & Telecoms markets. Proximus Luxembourg addresses both residential and business markets through its commercial brands Tango, Proximus NXT and more recently Codit.

With PSF support status, the company has almost 750 employees. All these experts share a passion for digital technology, a spirit of openness and innovation, and a desire to simplify, connect and make their customers' personal and professional activities ever more secure.

Proximus Luxembourg is actively contributing to the acceleration of Luxembourg's digitalisation and its economic influence through the development of connectivity, resilient infrastructures and 5G, as well as innovative technologies such as Blockchain, Artificial Intelligence, Machine Learning and IoT.

Proximus Luxembourg is a subsidiary of the Proximus group (Euronext Brussels: PROX), provider of digital services and communication solutions operating in the Belgian and international markets.

Your Mission
This position is responsible for incident resolution and request handling on the Datacenter network and security infrastructure scope.

Responsibilities include installation, configuration, patching, upgrades, monitoring, capacity management and maintenance of switches, routers, firewalls, NAC, load balancers, web application firewalls, proxies, DNS and VPN connectivity.

Datacenter infrastructure is a mixed Cisco ACI and Cisco Nexus environment. Security technologies are mainly PaloAlto/Checkpoint/Fortinet/Cisco FirePower firewalls, F5 load balancers and WAF, Infoblox and Efficient IP DNS. Upgrades to network and security infrastructure typically require work outside business hours to avoid user disruption.

Position functions as Level II / Level III support and will be responsible for handling and resolving end-user tickets if level I is not able to treat them. Position is also part of the On-call role 24/7 once every 5 weeks to intervene on service interruption based on major incidents.

The Network and Security Engineer work closely with vendors and manufacturer staff to coordinate operation and repair, and to determine and correct problems that may occur during set-up and operation. Consults with vendors and manufacturers regarding product compatibility, investigate user complaints of malfunctioning equipment; isolates the fault and makes repairs where appropriate.

Essential Responsibilities

• Installation, configuration, monitoring and incident/problem resolution of Network
• switching equipment and routing equipment
• Monitoring and incident/problem resolution of security equipment
• Installation, configuration of part of the security equipment
• Patch/upgrade systems to maintain the required security and support levels
• Monitor performance and capacity of the infrastructure
• Works closely with users to understand needs, define and solve incidents/problems
• Instructs users in order to avoid recurring incidents/problems
• Maintains a current knowledge of changes in the data communications field

Your Profile

• A bachelor's degree in IT or IT Security, or equivalent professional competencies supported
• by relevant certifications and extensive experience.
• Hardware, software and networking protocols utilized in LAN, WAN and related data
• communication systems, including fiber optics and peripheral equipment
• LAN switch and router management
• Router protocols and setup
• TCP/IP communication
• VLAN expertise
• Configure and troubleshoot networking technologies, including MPLS, BGP, OSPF, and EIGRP
• Cisco IOS software (ACI is a plus)
• Firewalls and VPN servers
• Syslogs and syslog servers
• The use and care of tools and equipment related to the installation, troubleshooting,
• maintenance and upgrading of a variety of data/security networks and communication
• hardware and software
• Record keeping practices and procedures

Ability To

• Prioritize competing requests for service, multiple tasks, and organize schedules to meet SLA
• and deadline requirements
• Explain technical information to non-technical users
• Prepare clear, concise reports, documentation and correspondence
• Communicate professionally and effectively, both orally and in writing
• Work professionally and productively with all who are involved in the course of work, including
• other team members, other departments, Project Managers, Service Delivery Managers,
• customers
• Experience with LAN and security equipment which should include Cisco routers, Cisco
• switches (Cisco CCNA or CCNP certification is a plus), at least 2 firewall brands (Palo Alto is a
• plus), F5 load balancer (WAF and other modules is a plus)

Our Offer
A professional and stimulating work environment in the IT & telecom sector. Multiple career opportunities within the Proximus Group at national and international level, cutting-edge training in new technologies, a wealth of recognized expertise. We also offer an attractive salary package and many other benefits.

Our company is an equal opportunity employer, valuing diversity in all its forms. We firmly believe that each individual brings a unique richness to our teams, and we are committed to creating an inclusive environment where every voice counts.

If at the end of the process your application is successful, you will be asked to provide an extract from your criminal record. Your personal information will be handled in compliance with applicable data protection laws.