Network Security Engineer F5 Senior

h3What you will do /h3 pYou 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 work supports the digital transformation of critical systems, ensuring they remain secure, modern and performant. /p pYour main responsibilities include: /p ul liInstalling, configuring and managing the F5 AWAF infrastructure (APM, ASM, LTM, Identity Provider, SSL VPN) /li liDeveloping, documenting and monitoring the application of security policies /li liContinuously monitoring and evaluating the security posture of IT systems, protecting against malicious activity /li liIntervening effectively in crisis situations such as organised attacks, network intrusions and virus detection /li liAdvising on technical solutions for securing partner connections via intranet and internet /li liConducting technical risk analyses across different IT systems /li liImplementing solutions to address identified vulnerabilitiesProducing technical documentation and incident or crisis reports /li /ul h3What we are looking for /h3 pYou are a senior technical expert with at least 10 years of experience in IT security. You work autonomously, take initiative and can respond effectively under pressure. /p pbTechnical expertise: /b /p ul liExpert-level knowledge of F5 AWAF infrastructure: APM, ASM, LTM, Identity Provider, SSL VPN /li liStrong understanding of network and application firewalls (Palo Alto, Forcepoint, Panorama) /li liExperience with VPN and proxy solutions /li liProficiency in monitoring and log correlation tools (Splunk, Nessus, Elastic SIEM) /li liDeep knowledge of network protocols and security: TCP/IP, HTTP/HTTPS, SSL, SNMP /li liUnderstanding of wireless security (WiFi, WEP, WPA, WPA2) and encryption principles /li liAbility to conduct technical risk analysis and remediate vulnerabilities /li /ul pbWorking style: /b /p ul liMethodical, precise and client-oriented approach /li liStrong written and verbal communication skills /li liRigorous documentation practices /li liTeam player who collaborates well with systems, operations and project teams /li /ul pbLanguages: /b /p ul liActive knowledge of French, Dutch and English is required. Bilingual proficiency in French and Dutch is preferred, or at least a solid working knowledge of a second national language alongside technical English. /li /ul pbEducation: /b /p ul liDegree in computer science or electronics, or equivalent demonstrated through confirmed experience /li /ul h3The setting /h3 pThis assignment runs until the end of December 2026, with a start as soon as possible. You will work hybrid from Brussels, combining on-site presence with remote work. You will report to the network and security team lead and collaborate closely with systems, operations and project teams. /p pYou 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. /p pbLocation: /b Brussels, hybrid /p pbWork address: /b Belgium /p pbEmployer / contracting party: /b HumanInTech /p pbApplications close (Brussels time): /b November 12, 2026 at 1:00 AM /p pbEngagement: /b Freelance or employed by HumanInTech /p pbWorking hours: /b Full-time /p pbExperience: /b More than 10 years or more /p pbEducation: /b Bachelor's or more /p pbPublished: /b November 2026 /p