Office based in our Sophia Antipolis (Valbonne, France) office 4 days per week or Kelsterbach (Frankfurt Germany)

Senior Network Security Engineer

About the Role

We're seeking an experienced network security engineer to build, operate, and scale our SASE architecture, encompassing both logical and physical infrastructure managed through Infrastructure as Code leveraging both Fortinet products and Linux (Open Stack) systems. You'll work across network architecture, security operations, and automation-designing solutions, driving incident resolution, and implementing systemic improvements to prevent recurrence.

This role includes participation in a 24x7 NOC on-call rotation and requires some staffed weekend coverage.

What You'll Do

Maintain network architectures across datacenter environments (logical & physical)
Build and optimize network monitoring and observability systems
Develop automation to detect, mitigate, and remediate network events and solve problems
Perform root cause analysis and drive issues to resolution
Maintain documentation and operational consistency across the infrastructure
Contribute to technical discussions and long-range capacity planning
Provide support to internal teams as a top-tier escalation point for all production issues

What You Bring

Networking (8+ years)

Expert-level hands-on experience with L2 switching, IP routing, and protocols (BGP, OSPF, MPLS, VRRP, STP, GRE, IPsec, SNMP)
Large-scale BGP experience: public ASNs, peering, route arbitration, IRRs

Network Security (8+ years)

Access control, threat management (vulnerabilities, malware, APTs, botnets)
SSL inspection, content categorization, security/risk frameworks
Fortinet product experience strongly preferred

Linux & Infrastructure (5+ years)

Administration of RHEL/CentOS, Ubuntu
Web servers, SQL databases, LDAP, etc.
Open Stack experience a plus (RHOSP/RHOSO preferred)

General

Strong troubleshooting instincts and documentation habits
Comfortable working independently in a ticket queue environment
Clear communicator who can context-switch between deep technical work and stakeholder updates

Nice to Have

Cloud experience (AWS, GCP, Azure)
Infrastructure-as-code tools (Terraform, Ansible)
Load balancing and DDoS mitigation at scale
Certifications: NSE7/8, CCIE R&S, RHCSA/RHCE

Fluency in English essential + business level of local language highly desirable

Must be prepared to work 1 weekend day and oncall infrequently