Network Security Engineer F5 Senior

HumanInTech; Brussel Hoofdstad; Hybride; EUR 75 000 - 110 000; Plein temps

Résumé du poste

HumanInTech in Brussels offers a senior network security role focusing on F5 Advanced Web Application Firewall infrastructure. You will manage, monitor and evolve security controls, respond to incidents, and advise on secure connections with partners.

The role requires at least 5 years of IT security experience and strong technical and communication skills. The assignment runs with a hybrid work arrangement in Brussels, open to freelance or employee engagement.

Qualifications

• Minimum 5 years of IT security experience.
• Experience installing, configuring and managing F5 AWAF infrastructure (APM, ASM, LTM, Identity Provider, SSL VPN).
• Proven ability to monitor security and manage crisis situations (attacks, intrusions, viruses).
• Technical risk analysis and remediation of vulnerabilities.
• Knowledge of network/firewall and VPN/proxy solutions; experience with log correlation tools.

Responsabilités

• Join the network and security team to manage and evolve F5 and AWAF infrastructure.
• Develop, document and monitor security policies for applications and IT environments.
• Continuously monitor security state and respond to incidents and threats.
• Provide crisis management during attacks, intrusions and virus detections.
• Advise on technical solutions for secure connections with partners via intranet and internet.
• Perform technical risk analyses and address identified vulnerabilities.
• Produce technical documentation and incident/crisis reports.

Connaissances

F5 AWAF

Network security

Crisis management

Security policy development

Documentation

Autonomy

Communication

Formation

Bachelor's degree in computer science or electronics

Higher degree or equivalent experience

Outils

Splunk

Nessus

Elastic SIEM

Description du poste

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