Network Security Engineer F5

Function

We're looking for a highly experienced IT Security Specialist to join our client's team and strengthen the security of critical digital services and high-availability IT environments. In this consulting role, you will be responsible for managing and evolving web application security solutions, improving the organisation's security posture and ensuring effective incident response capabilities. You will play a key role in reducing security risks, protecting sensitive systems and responding decisively to critical security events.

Responsibilities

Working closely with technical teams and management, you will take ownership of the operational security infrastructure and contribute to the continuous improvement of security measures. Your responsibilities will include:

• Manage, maintain and continuously improve web application security infrastructure.
• Install, configure and operate F5 technologies and Advanced Web Application Firewall (AWAF) components.
• Develop, implement, document and monitor security policies and controls.
• Monitor the security posture of IT systems and assess their resilience against malicious activity.
• Investigate and respond to security incidents, including coordinated attacks, network intrusions and malware detection.
• Conduct technical risk assessments across various IT environments.
• Identify vulnerabilities, evaluate potential threats and implement appropriate remediation measures.
• Advise on secure technical solutions for partner connectivity across internal and external networks.
• Produce clear technical documentation, security assessments and incident or crisis reports.

Your Profile

You are a senior IT security professional with at least 10 years of relevant experience and a strong hands-on background in network and application security. You are autonomous, proactive and comfortable taking responsibility in complex operational environments, including situations requiring rapid decision-making and crisis management.

The ideal candidate brings:

• Extensive hands-on experience with F5 AWAF technologies, including APM, ASM, LTM, Identity Provider and SSL VPN.
• Strong expertise in network and application firewalls, particularly Palo Alto, Forcepoint and Panorama.
• Solid experience with VPN, proxy and remote access solutions, including site-to-site VPN and web proxy technologies.
• Proven capabilities in security monitoring, technical risk analysis, vulnerability management and remediation.
• Knowledge of security monitoring and log-correlation platforms such as Splunk, Nessus and Elastic SIEM.
• A strong understanding of TCP/IP, HTTP/HTTPS, SSL and SNMP.
• Awareness of wireless security principles and encryption technologies.
• Experience with terminal-server environments such as Citrix.
• Excellent written and verbal communication skills, with the ability to produce structured technical documentation and reports.
• A precise, analytical and client-oriented approach, combined with the ability to collaborate effectively with technical and management stakeholders.

A degree in IT, electronics or an equivalent field is preferred, although proven professional experience is also considered. This position requires a senior-level profile capable of working independently under general direction, corresponding to SFIA level 4.

Practical Information

• Location: Brussels, with teleworking possibilities.
• Languages: Fluent Dutch and English are required, alongside a good command of French. Bilingual Dutch/French proficiency is preferred, with at least a sufficient working knowledge of the second national language.

Contactperson & Reference

• Reference #: INW28845
• Pieter Messely
• pieter.messely@i4m.be