Network Security Engineer F5 Senior

What you will do

You will join the network and security team of a Belgian public-sector organisation to manage and evolve their F5 and Advanced Web Application Firewall infrastructure. Your role is to ensure the security of applications and IT environments in the context of ongoing digital transformation. Your main responsibilities include: Install, configure and manage the F5 security infrastructure: F5, Advanced Web Application Firewall (APM, ASM, LTM, Identity Provider, SSL VPN) Develop, document and monitor the application of security policies Continuously monitor and evaluate the security state of IT systems and their protection against malicious actions Intervene effectively in crisis situations (organised attacks, network intrusions, virus detection, etc.) Advise on technical solutions for securing connections with external partners via intranet and internet Conduct technical risk analyses for management purposes on various IT systems Implement solutions to address identified vulnerabilities Produce technical documentation and incident/crisis reports What we are looking for

You are a senior technical profile with proven expertise in network security and F5 technologies. You work autonomously under general direction and can respond effectively in high-pressure situations. Essential experience and skills: Minimum 5 years of experience in IT security Installation, configuration and management of F5 AWAF infrastructure (APM, ASM, LTM, Identity Provider, SSL VPN) Continuous monitoring and evaluation of system security; crisis management (attacks, intrusions, viruses) Technical risk analysis and vulnerability remediation Knowledge of network and application firewalls (Palo Alto, Forcepoint, Panorama) and VPN/proxy solutions Monitoring and log correlation tools (Splunk, Nessus, Elastic SIEM) Network protocols and security: TCP/IP, HTTP/HTTPS, SSL, SNMP Wireless network security (WiFi, WEP, WPA, WPA2) and encryption principles (public/private key) VPN solutions (remote access and site-to-site) and web proxy; terminal server solutions (Citrix) Rigorous documentation and clear communication with teams and management Strong written and verbal communication skills; methodical, precise and client-oriented approach Autonomy and initiative; explicitly not a junior profile Languages: Active knowledge of French, Dutch and English is required. Bilingual (French/Dutch) is preferred, or sufficient basic knowledge of a second national language; technical English is essential. Education: Graduate or degree in computer science or electronics, or equivalent through confirmed experience. The setting

This assignment runs from 1 November 2026 to 31 December 2026. You will be based in Brussels with a hybrid working arrangement. You will work within the network and security team, collaborating with systems, operations and project teams. You can join us for this assignment as a freelancer or as an employee of HumanInTech. Same role, same team. If you join as an employee, your employment continues beyond this assignment. When it ends, we’ll work together to find your next assignment. Location:

Brussels, hybrid Work address:

Belgium Employer / contracting party:

HumanInTech Applications close (Brussels time):

October 7, 2026 at 2:00 AM Engagement:

Freelance or employed by HumanInTech Working hours:

Full-time Experience:

6-10 years or more Education:

Bachelor's or more Published:

October 2026