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 work supports the digital transformation of critical systems, ensuring they remain secure, modern and performant.

Your main responsibilities include:

• Installing, configuring and managing the F5 AWAF infrastructure (APM, ASM, LTM, Identity Provider, SSL VPN)
• Developing, documenting and monitoring the application of security policies
• Continuously monitoring and evaluating the security posture of IT systems, protecting against malicious activity
• Intervening effectively in crisis situations such as organised attacks, network intrusions and virus detection
• Advising on technical solutions for securing partner connections via intranet and internet
• Conducting technical risk analyses across different IT systems
• Implementing solutions to address identified vulnerabilitiesProducing technical documentation and incident or crisis reports

What we are looking for

You are a senior technical expert with at least 10 years of experience in IT security. You work autonomously, take initiative and can respond effectively under pressure.

Technical expertise:

• Expert-level knowledge of F5 AWAF infrastructure: APM, ASM, LTM, Identity Provider, SSL VPN
• Strong understanding of network and application firewalls (Palo Alto, Forcepoint, Panorama)
• Experience with VPN and proxy solutions
• Proficiency in monitoring and log correlation tools (Splunk, Nessus, Elastic SIEM)
• Deep knowledge of network protocols and security: TCP/IP, HTTP/HTTPS, SSL, SNMP
• Understanding of wireless security (WiFi, WEP, WPA, WPA2) and encryption principles
• Ability to conduct technical risk analysis and remediate vulnerabilities

Working style:

• Methodical, precise and client-oriented approach
• Strong written and verbal communication skills
• Rigorous documentation practices
• Team player who collaborates well with systems, operations and project teams

Languages:

• Active knowledge of French, Dutch and English is required. Bilingual proficiency in French and Dutch is preferred, or at least a solid working knowledge of a second national language alongside technical English.

Education:

• Degree in computer science or electronics, or equivalent demonstrated through confirmed experience

The setting

This assignment runs until the end of December 2026, with a start as soon as possible. You will work hybrid from Brussels, combining on-site presence with remote work. You will report to the network and security team lead and collaborate closely 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): November 12, 2026 at 1:00 AM

Engagement: Freelance or employed by HumanInTech

Working hours: Full-time

Experience: More than 10 years or more

Education: Bachelor's or more

Published: November 2026