Network & Security Engineer Expert

Mission Overview:

Keystone Solutions is seeking a Network & Security Engineer Expert for a consultancy mission at a client site. In this role, you will work alongside various infrastructure, application, security, and telephony teams, responsible for the design, implementation, maintenance, and security of diverse network infrastructures, Wi-Fi, security, and telephony systems.

Key Responsibilities:

• Contribute to the definition and implementation of standardized and automated processes to optimize operations and enhance team efficiency.
• Provide significant value to infrastructure projects by producing necessary technical documentation (High-Level Design, Low-Level Design, DAT) for management and maintenance.
• Engage in diverse projects such as the implementation or improvement of network infrastructures, establishment of security solutions, and conducting network audits for clients.
• Maintain an active watch to identify developments and opportunities for infrastructure improvements.
• Participate in the production of new network and security requirements.

Candidate Profile:

The ideal candidate must be flexible and autonomous, capable of traveling to client sites in the Brussels region and participating in on-call roles. You should demonstrate rigor, precision, proactivity, adherence to schedules, client-oriented solutions, and strong analytical skills. Proficiency in technical English is essential.

At Keystone Solutions, we pride ourselves on our consultancy nature, offering dynamic projects that provide a broad learning experience and opportunities for career growth. Being a

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.

Duration: 03/08/2026 - 31/03/2027 8 months • (full time)

Skills required:

• Automatisation : scripting, Ansible - Level: Intermediate - Most recent: This year
• MS tools (O365, Visio) - Level: Advanced - Most recent: This year
• Réseaux Cisco : administration et exploitation de commutateurs (Catalyst, Nexus), contrôleurs Wi-Fi (WLC), Cisco DNA Center (DNAC) et outils de supervision associés. - Level: Expert - Most recent: This year
• Réseaux et protocoles : TCP/IP, IPv4/IPv6, VLAN, MPLS, VPN/IPsec, routage dynamique (BGP, OSPF, EIGRP), SD-WAN. - Level: Expert - Most recent: This year
• Sécurité réseau : administration de pare-feu (Fortinet, Palo Alto), contrôle d'accès réseau (NAC, IEEE 802.1X), solutions F5 (LTM/APM) - Level: Advanced - Most recent: This year
• Services d'infrastructure réseau : DNS, DHCP, IPAM/DDI. - Level: Advanced - Most recent: This year
• Supervision et diagnostic : Wireshark (analyse avancée), PRTG - Level: Advanced - Most recent: This year
• Virtualisation : VMware vSphere - Level: Intermediate - Most recent: 1 to 3 years ago

Language requirements:

Dutch
Level Elementary proficiency
English
Level Full professional proficiency
French
Level Native or bilingual proficiency