For one of our major clients in Brussels, we are looking for an experienced Senior Network Security Engineer to support and secure a complex, business‑critical network environment. The role focuses on designing, implementing, and operating advanced network security solutions, while driving automation initiatives and supporting internal teams. Main responsibilities Design and deploy network security architectures and protection strategies Configure, manage, and operate Palo Alto firewalls in production environments Configure and maintain firewalls, VPNs, proxies (forward & reverse), and load balancers Develop and maintain automation playbooks using Ansible Monitor network performance and security, manage incidents, and perform security audits and vulnerability assessments Provide advanced technical support and act as an escalation point for network security issues Participate in an on-call rotation, including night operations, with the ability to intervene on-site when required Coach and support the internal network team Create and maintain technical documentation and security processes (including NIS2) Work model & availability Hybrid setup: 3 days per week on-site in Brussels, 2 days remote On-call duties, including night shifts and night on-site operations, are a mandatory part of the role Required expertise 5 years of experience in network security engineering Proven hands-on experience with Palo Alto firewall technologies Strong knowledge of routing, ISP connectivity, ExpressRoute, DNS, Wi‑Fi, and TACACS Solid experience with cloud security and secure access concepts (ZTNA) Demonstrated experience in network automation and Ansible playbook creation Strong problem‑solving, communication, and leadership skills Languages English: B2 French: C1 Dutch: B2 Security certifications (e.g. Security) are considered an asset. What can Econocom offer you? An attractive salary complemented by hospitalization and group insurance, meal and eco vouchers, a company car, and the possibility of working from home. Upon joining, you will be assigned a Competence Manager who will introduce you to the company and guide your individual career. Various blended training opportunities that will help you grow professionally. Fun – through our quarterly events where you are informed about the workings of Econocom and stay in contact with colleagues. Econocom – in brief: Econocom Benelux is part of a French listed group, active in the market for over 45 years, with entrepreneurship being an important pillar of the company. Econocom has a unique position in the Belgian market. Thanks to the complementarity of ICT equipment, services, and financing, Econocom can provide modular end-to-end solutions. Econocom places a strong emphasis on corporate social responsibility (CSR) and makes a significant contribution to the circular economy. If you are looking for Digital & Green and an ICT company that places customers and employees at the heart of its operations, Econocom is the place for you… We’d love to hear from you! Econocom is committed to promoting an inclusive and respectful work environment, where every individual is valued regardless of race, gender, age, religion, sexual orientation, disability, or any other characteristic protected by law.