About the Role

We are looking for an experienced Network Designer / Architect to join a mission-critical network environment in Brussels. The successful candidate will act as a design authority for a large-scale customer access network, working alongside senior network designers and architects. The role focuses on defining and managing the hardware and software lifecycle of a Juniper- and Cisco-based Hub-and-Spoke network architecture, while ensuring high levels of security, resilience, availability, and operational integrity. Regular on-site presence in Belgium is required to support testing, validation, and implementation activities.

Key Responsibilities

• Contribute to the evolution of network architecture and technology solutions through strategic evaluation of new technologies, products, and design improvements.

• Define and review network solutions in collaboration with architects, engineering teams, business stakeholders, customers, management, and technology partners.

• Provide senior-level technical guidance throughout solution design and implementation activities.

• Ensure network designs meet technical, operational, resilience, and cybersecurity requirements.

• Act as a senior escalation point for complex network and infrastructure incidents.

• Support operational teams with advanced troubleshooting, root-cause analysis, and resolution of critical network issues.

• Work closely with technology vendors and cybersecurity teams to identify and remediate network security vulnerabilities.

• Define and coordinate software upgrades, security patches, configuration improvements, and lifecycle initiatives.

• Participate in cross-functional projects as a Network Subject Matter Expert and contribute to technical design reviews.

• Maintain high-quality technical and network design documentation and stay current with networking and cybersecurity developments. Required Technical Expertise • Cisco Routing & Switching - senior level

• Juniper SRX - extensive hands-on expertise

• Juniper SD-WAN

• QoS and VPN technologies

• Network Security

• Network architecture and design

• Mission-critical network environments

• Technical and design documentation

• Experience with Ansible, Bitbucket, and network automation is highly valuable

Experience Profile

• 8+ years of relevant experience in network infrastructure, network design, or architecture.

• Strong hands-on background with Cisco and Juniper technologies.

• Extensive experience designing and supporting complex enterprise network environments.

• Proven ability to troubleshoot complex technical issues and provide senior-level technical guidance.

• Experience in environments where security, resilience, availability, and operational stability are critical.

• Ability to communicate effectively with architects, engineers, cybersecurity specialists, vendors, management, and business stakeholders.

• Comfortable operating both at architecture/design level and close to implementation and operational teams.

Location

• Brussels, Belgium

Work mode

• Full-time

• On-site presence: Regular presence in Belgium require