apply by 7 November 2026
Senior Network Engineer
- Palo Alto firewalls
- Complex enterprise and campus networks
- Aruba Wireless
- English
A large organisation operating a complex, multi-site IT environment is seeking a Senior Network Engineer / Network Security Specialist for its IT Operations team. The consultant will help manage, optimise and secure a large enterprise campus network. The hands-on assignment combines network engineering, firewall management, network access control, infrastructure modernisation and security segmentation.
> Profile and essential requirements
- Minimum 5 years of proven experience as a Network Engineer / Network Specialist.
- Strong hands-on experience managing complex enterprise and campus networks.
- Proven experience with network infrastructure administration and configuration.
- Expertise in Palo Alto firewalls, including Active/Active and Active/Passive clusters, Panorama, firewall rulebase management and network segmentation.
- Strong knowledge of Aruba Wireless: Aruba AOS8, Aruba AOS10 and Aruba Central.
- Advanced knowledge of LAN/WLAN, BGP, DNS/DHCP, 802.1X and Network Security.
- Ability to independently manage complex technical issues and implementations.
- Excellent troubleshooting and analytical skills.
- English: CEFR C2 – mandatory.
- Dutch is not required.
- Is comfortable working in large and technically complex environments.
- Combines strong infrastructure knowledge with a security-oriented mindset.
- Can take technical ownership of implementation projects.
- Works independently and proactively identifies improvements.
- Communicates effectively with technical and non-technical stakeholders.
- Produces clear technical documentation and operational procedures.
> What we offer
- Hybrid working arrangement: minimum 2 days onsite per week.
- Full-time engagement.
> Optional assets
- Aruba ClearPass NAC – ideally 5 years of experience.
- Extreme Networks wired campus infrastructure: Fabric networking, IS-IS / SPBM, XIQ-SE.
- Experience managing multi-site enterprise networks.
- Strong Routing & Switching expertise.
- Advanced LAN/WAN protocol knowledge.
- Juniper Switching (JunOS).
- Juniper Apstra.
- F5 LTM / AFM / DDoS.
- Infoblox.
- Experience with network migrations and security architecture improvements.
> Additional details
Responsibilities include managing, maintaining and optimising complex LAN/WAN/WLAN infrastructures; configuring and troubleshooting enterprise networking equipment; administering Palo Alto firewalls and managing policies through Panorama; contributing to network segmentation; analysing complex networking incidents; supporting NAC deployment and Aruba wireless initiatives; and participating in firewall migrations and security improvements. The consultant will take technical ownership of implementations, configure, test and validate solutions, prepare technical documentation and operational procedures, coordinate stakeholders, and ensure solutions are maintainable and aligned with operational requirements.
The assignment is in the Brussels region. Start date: 04 January 2027. End date: 30 June 2027. Initial duration: approximately 6 months. Full-time workload, estimated 928 hours. Freelance assignment.