Network Security Engineer

Job Title: Network Security Engineer F5 Senior

Duration: 01/11/2026 - 31/12/2026

Location: Brussels, Belgium (Hybrid, 2 days per week on-site)

Languages: English, French & Dutch

Job Description - Roles and Responsibilities

• We are looking for a Senior IT Security Network, an F5 expert, capable of guaranteeing the security of IT applications and environments in the face of the challenges of digital transformation.
• The consultant contributes to the digitalization, modernization and implementation of modern, mobile, secure and efficient systems, while ensuring continuous monitoring of the security status of systems and a capacity for rapid intervention in crisis situations.

Mission

• The function ensures the management, security and continuous evolution of the F5/AWAF infrastructure, as well as the continuous monitoring and evaluation of the security status of IT systems, with an effective crisis response capability.

Deliverables

• F5 / Advanced Web Application Firewall infrastructure installed, configured and managed
• Security policies developed, documented and monitored
• Technical risk analyses carried out on the various IT systems
• Solutions implemented to address identified vulnerabilities
• Recommendations on technical solutions for securing partner connections (intranet/internet)
• Technical documentation and incident/crisis reports

Main tasks

• Manage the infrastructure F5 Security: F5, Advanced Web Application Firewall
• Install, configure and manage F5 - AWAF
• Develop, document and monitor the application of security policies
• Continuously monitor and assess the state of IT systems in terms of security and protection against malicious actions
• Intervene effectively in crisis situations (organized attacks, network intrusions, virus detection, etc.)
• Advise on technical solutions for securing connections with external partners via the intranet and the internet
• Perform technical risk analyses for management purposes on the various IT systems
• Implement solutions to address potential vulnerabilities

Key Competencies

• Install, configure and manage the F5 AWAF infrastructure (APM, ASM, LTM, Identity Provider, SSL VPN)
• Continuous monitoring and evaluation of the security status of systems; 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
• Rigorous documentation and clear communication to teams and management

Communication and collaboration

• Written and verbal communication skills; able to clearly document their work (reports, documentation)
• Ability to work in a team; Methodical, precise and customer-oriented approach
• Bilingual preferably (French, Dutch) or sufficient basic knowledge of a second national language; Technical English essential

Skills

• Firewalls and filtering: routers, stateful packet inspection firewalls, application firewalls (Palo)
• Log monitoring and correlation tools (Splunk, Nessus, Elastic SIEM)
• Network protocols and security: TCP/IP, HTTP/HTTPS, SSL, SNMP
• Securing wireless networks (WiFi, WEP, WPA, WPA2) and encryption principles (public key/p/p)
• VPN (remote access and site-to-site) and Web proxy solutions; Terminal-server solutions (Citrix)