As Network Security Engineer you will be a key element of the department, strong of his 30 collaborators based on 3 countries, supporting the infrastructures: Network, Storage, Backup, Virtualization & IT Room Facilities. You will be responsible for implementing, maintaining, supporting, and operating Network Security (NS) infrastructure. Tasks Ensure the integrity of high availability NS infrastructure to provide maximum performance for the users. Troubleshoot, perform root cause analysis, and identify NS related problems Participate in team collaboration to share engineering efforts, technical challenges, and breakthroughs Work with vendors and team members to troubleshoot issues related to the operations (Problem management) Profile: Minimum 4 years' experience in NS technologies Acts as a subject matter expert and expertly articulates solutions through written or verbal methods In-depth demonstrable skills in system and functional analysis and problem diagnostic, capability of producing high quality specification and documentation Demonstrated ability for good communication (oral and written) to all levels of the organization English is mandatory and French would be a great asset. Resistance to stress, work on major incidents and participate to reviews (post-mortem) Candidates for this position should be willing to perform shift work rotation (2 shifts from 7am to 8pm and participate in 24/7 on call rotation Technical skills CCNA Enterprise, Cisco Technologies or equivalent knowledge Firewall and application layer GateWay VPN and remote access architectures Authentication systems and protocols Security systems management and administration Access List Cisco Encryption techniques and protocols Network traffic segregation (VLAN, VRF, MPLS, trunking, ...) One or several of the following technologies / certifications is a bonus: Cisco (ASA and ISE), Cisco AnyConnect VPN CheckPoint (CCSA) Fortinet (NSE 4 or more) RSA technologies Cronos Europa is an IT and digital communications company uniquely dedicated to serving the European institutions, agencies and bodies. From the European Union to EUROCONTROL, we partner with a range of supranational and interinstitutional authorities. Our mission is to arm them with the tools they need to thrive in the digital age. Every aspect of our organisation is designed to complement their capabilities - from our people to our processes and our premises. Our brand combines the expertise of former companies Cronos International and C-Dev, with the creative skills of Inspiiro and the breadth of capabilities of the Cronos Group. Today, Cronos Europa employs over 1,000 people in offices across Belgium, Luxembourg and the Netherlands, serving institutions across diverse framework contracts. Cronos Europa is part of the Cronos Group, one of the largest IT service providers in the Benelux, employing over 8,000 people across 200 competence centres. By leveraging the Group's resources, Cronos Europa can help clients extract value from new and emerging technologies, for everything from Artificial intelligence to Zg Quantum.