Network Security Engineer F5 Senior

h3What you will do /h3pYou 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. /ppYour main responsibilities include: /pulliInstall, configure and manage the F5 security infrastructure: F5, Advanced Web Application Firewall (APM, ASM, LTM, Identity Provider, SSL VPN) /liliDevelop, document and monitor the application of security policies /liliContinuously monitor and evaluate the security state of IT systems and their protection against malicious actions /liliIntervene effectively in crisis situations (organised attacks, network intrusions, virus detection, etc.) /liliAdvise on technical solutions for securing connections with external partners via intranet and internet /liliConduct technical risk analyses for management purposes on various IT systems /liliImplement solutions to address identified vulnerabilities /liliProduce technical documentation and incident/crisis reports /li /ulh3What we are looking for /h3pYou 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. /ppbEssential experience and

skills:
/b /pulliMinimum 5 years of experience in IT security /liliInstallation, configuration and management of F5 AWAF infrastructure (APM, ASM, LTM, Identity Provider, SSL VPN) /liliContinuous monitoring and evaluation of system security; crisis management (attacks, intrusions, viruses) /liliTechnical risk analysis and vulnerability remediation /liliKnowledge of network and application firewalls (Palo Alto, Forcepoint, Panorama) and VPN/proxy solutions /liliMonitoring and log correlation tools (Splunk, Nessus, Elastic SIEM) /liliNetwork protocols and security: TCP/IP, HTTP/HTTPS, SSL, SNMP /liliWireless network security (WiFi, WEP, WPA, WPA2) and encryption principles (public/private key) /liliVPN solutions (remote access and site-to-site) and web proxy; terminal server solutions (Citrix) /liliRigorous documentation and clear communication with teams and management /liliStrong written and verbal communication skills; methodical, precise and client-oriented approach /liliAutonomy and initiative; explicitly not a junior profile /li /ulpbLanguages: /b /ppActive 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. /ppbEducation: /b /ppGraduate or degree in computer science or electronics, or equivalent through confirmed experience. /ph3The setting /h3pThis 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. /ppYou 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. /ppbLocation: /b Brussels, hybrid /ppbWork address: /b Belgium /ppbEmployer / contracting party: /b HumanInTech /ppbApplications close (Brussels time): /b October 7, 2026 at 2:00 AM /ppbEngagement: /b Freelance or employed by HumanInTech /ppbWorking hours: /b Full-time /ppbExperience: /b 6-10 years or more /ppbEducation: /b Bachelor's or more /ppbPublished: /b October 2026 /p