Senior Network Security Engineer (F5)

Location: On-site in Brussels, Belgium; remote work possible

Company

hirify.global provides consultancy services, with this mission embedded in a client’s Network & Security team.

What you will do

• Install, configure, manage, and continuously evolve F5 and Advanced Web Application Firewall infrastructure.
• Develop, document, and monitor application security policies.
• Monitor and evaluate the security status of IT systems against malicious activity.
• Conduct technical risk analyses and implement solutions to remediate vulnerabilities.
• Respond to crisis situations including organized attacks, network intrusions, and virus detection.
• Recommend technical solutions for securing partner connections through intranet and internet networks, and produce technical and incident documentation.

Requirements

• Minimum 10 years of experience in IT security; this is explicitly not a junior role.
• Expert, autonomous execution under general direction at SFIA level 4 – Enable.
• Expert experience installing, configuring, and managing F5 AWAF infrastructure, including APM, ASM, LTM, Identity Provider, and SSL VPN.
• Knowledge of network and application firewalls, including Palo Alto, Forcepoint, and Panorama, as well as VPN and proxy solutions.
• Experience with firewall filtering, routers, stateful packet inspection, application firewalls, monitoring and log-correlation tools including Splunk, Nessus, and Elastic SIEM.
• Expert knowledge of TCP/IP, HTTP/HTTPS, SSL, SNMP, wireless network security, encryption principles, VPN solutions, web proxies, and Citrix terminal-server solutions.
• Technical risk analysis, vulnerability remediation, crisis intervention, and security-status monitoring capabilities.
• Degree or equivalent qualification in computer science or electronics, or equivalent confirmed experience.
• Active knowledge of Dutch, French, and English is required; technical English is essential.
• Strong written and verbal communication skills, clear technical documentation ability, and a methodical, precise, team-oriented, client-focused approach.

Culture & Benefits

• Full-time external consultancy mission representing hirify.global at the client site.
• On-site work in Brussels with remote work possible.
• Collaboration with network and security, systems, operations, and project teams.
• Reports to the Network & Security Team Leader.
• Mission duration is two months, ending 31/12/2026, with a start as soon as possible.

Hiring process

• Apply through the hirify.global Career Portal.