For an organization operating in a critical infrastructure environment, an IT Senior Network Engineer is sought to support the implementation of network segregation initiatives and maintain a modern, secure, and resilient LAN infrastructure. The assignment is long-term and involves both operational network engineering and project-based activities in a complex IT/OT environment.
The consultant will contribute to the maintenance, evolution, and security of the organization's network infrastructure, with a strong focus on LAN, network segregation, OT resilience, and monitoring.
What you will do.
- Maintaining and updating the Extreme Networks infrastructure.
- Following up security tickets and CVEs related to LAN components, including switches, Wi-Fi, NAC, and related network equipment.
- Providing second-line support to users and technical teams.
- Configuring and programming Extreme switches.
- Supporting a business continuity project through the design and implementation of Extreme network equipment.
- Performing physical data center maintenance activities, including rack-related tasks.
- Configuring, testing, implementing, and improving monitoring through SolarWinds, including alarms and dashboards.
- Supporting OT security monitoring by configuring Nozomi-related network requirements, including mirror ports on Extreme switches.
- Working with Extreme XIQ.
- Supporting network resilience initiatives in OT environments.
- Fine-tuning existing network implementations.
- Documenting new requests, existing infrastructure, changes, and technical decisions.
- Ensuring compliance with GDPR, ISO27001, and NIS2 requirements throughout the mission.
What they ask
- Strong experience as a Senior Network Engineer in complex LAN environments.
- Advanced knowledge of Cisco Routing & Switching.
- Expert knowledge of DNS and DHCP.
- Strong hands-on experience with Extreme Networks technologies, especially:
- Extreme OS
- Extreme NAC
- Extreme XIQ
- Strong knowledge of routing protocols.
- Strong understanding of network segregation and network security principles.
- Good knowledge of LACP, MLAG, and mirror port configuration.
- Experience with Palo Alto firewalls, Panorama, and PAN-OS.
- Experience with SolarWinds IPAM, monitoring, alarms, and dashboards.
- Experience or strong understanding of OT networking environments.
- Knowledge of Nozomi for OT networking is a strong asset.
- Experience with industrial networks, SCADA, or critical infrastructure environments is a strong plus.
- Ability to produce and maintain clear technical documentation.
- Understanding of ISO27001, NIS2, and security requirements for essential service operators.
Profile
- At least 7 years of professional experience in IT.
- Fluent in FR/ENG or NL/ENG.
- Eager to learn, motivated, and curious.
Languages.
- French: full professional proficiency.
- Dutch: full professional proficiency.
- English: full professional proficiency.
Soft skills.
- Autonomous and hands-on mindset.
- Strong troubleshooting and analytical skills.
- Ability to work in critical and regulated environments.
- Good communication skills with technical and non-technical stakeholders.
- Structured approach to documentation, change management, and security compliance.
How to apply
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