Network Security Engineer F5

We’re looking for a Senior Network & Security Engineer to join our client’s team and take ownership of the security, administration and continuous evolution of critical network security infrastructure. This is a highly autonomous, hands‑on role for an experienced security professional who can combine strong technical expertise with a structured approach to risk management, vulnerability remediation and incident response.

Role & Responsibilities

• Install, configure, administer and continuously improve F5 / Advanced Web Application Firewall (AWAF) infrastructure, including APM, ASM, LTM, Identity Provider and SSL VPN technologies.
• Develop, document and monitor the implementation of security policies and standards.
• Continuously assess the security posture of IT systems and identify potential threats, vulnerabilities and weaknesses.
• Conduct technical risk assessments across different IT environments and provide actionable recommendations.
• Implement remediation measures to address identified vulnerabilities and improve the overall security posture.
• Advise on secure technical solutions for internal and external partner connectivity, including intranet and internet connections.
• Contribute actively to security incident and crisis management, including coordinated attacks, network intrusions, malware/virus incidents and other critical security events.
• Produce clear and rigorous technical documentation, security assessments and incident/crisis reports.

Technical Profile

• F5 / AWAF installation, configuration, administration and troubleshooting.
• Application and network security technologies, including APM, ASM, LTM, Identity Provider and SSL VPN.
• Network and application firewalls, particularly technologies such as Palo Alto, Forcepoint and Panorama.
• VPN and Web Proxy solutions.
• Network security protocols and technologies including TCP/IP, HTTP/HTTPS, SSL and SNMP.
• Security monitoring, log analysis and correlation tools such as Splunk, Nessus and Elastic SIEM.
• Wireless network security, including Wi‑Fi, WEP, WPA/WPA2 and encryption principles.
• Remote‑access and site‑to‑site VPN solutions, Web Proxy technologies and terminal‑server environments such as Citrix.

Experience & Soft Skills

• 7+ years of relevant experience, with approximately 10 years or more in IT security strongly preferred.
• Proven ability to work independently under general direction and take ownership of complex technical security matters.
• Demonstrated experience handling security incidents and operating effectively under pressure during crisis situations.
• Strong analytical, risk‑assessment and problem‑solving capabilities.
• Excellent written and verbal communication skills, with the ability to produce high‑quality technical documentation and communicate effectively with both technical teams and management.
• Team‑oriented, methodical, precise and client‑focused.
• English is essential for technical communication; knowledge of French and/or Dutch is highly valued, with bilingual proficiency in French and Dutch considered an advantage.
• Degree in Computer Science, Electronics, IT or a related field, or equivalent professional experience.

Contactperson & Reference

• Reference #: INW28269
• Pieter Messely
• pieter.messely@i4m.be