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# Ingénieur Réseaux et Sécurité H/F

- **Company:** Opsynet
- **Location:** Guyancourt, France (Remote available)
- **Salary:** €45,000.0 - €55,000.0
- **Contract:** Permanent contract
- **Skills:** Bash Shell, Virtual Private Networks (VPN), Multi-protocol Systems, Python (Programming Language), Network Architecture, Routing, Network Administration, Network Protocols, PCI Data Security Standards, Public Key Infrastructure, Windows PowerShell, Wide Area Networks, Scripting, Load Balancing, Firewalls (Computer Science), Fortinet, Cisco
- **Published:** July 30, 2026
- **Apply:** https://fr.indeed.com/viewjob?jk=7d738594a9f49870

## About the Role

Environnement technique

 * Réseaux : LAN, WAN, MPLS, VPN, Switching, Routage, Load Balancer, Protocoles réseau
 * Cisco : ISE, WLC, DNA Center, Fabric
 * SD-WAN : Cisco SD-WAN, Fortinet SD-WAN
 * Sécurité : Fortinet Firewall, VPN, Gestion des certificats, PKI
 * Automatisation : Scripting, Python, Bash, PowerShell
 * Conformité : PCI-DSS, LPM

## Description

Dans un environnement réseau critique de grand compte, vous interviendrez sur des activités BUILD (70%) et RUN N3 (30%) autour des infrastructures réseau immeubles, agences et sites distants.

Vous serez en charge de :

 * Concevoir, déployer et faire évoluer les architectures réseau LAN/WAN.
 * Participer aux projets d'intégration et de transformation des infrastructures réseau.
 * Assurer le support de niveau 3 sur les incidents complexes.
 * Diagnostiquer et résoudre les problématiques réseau (performance, disponibilité, connectivité).
 * Administrer et maintenir les équipements réseau Cisco et Fortinet.
 * Participer à la mise en œuvre des solutions SD-WAN.
 * Réaliser les études techniques, analyses d'impact et rédiger la documentation associée.
 * Automatiser les tâches d'administration réseau via le scripting.
 * Assurer la gestion et le renouvellement des certificats.
 * Participer à l'amélioration continue des processus et des standards réseau.
 * Appliquer les exigences de sécurité liées aux environnements bancaires (PCI/LPM).
 * Collaborer avec les équipes infrastructures, sécurité et production.


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