(Senior) Network Engineer | (Senior) Network Engineer (m/w/d)

SysEleven GmbH

Berlin, Berlin, Deutschland
Published Jan 6, 2026
Full-time
Permanent

Job Summary

This role is critical for ensuring the smooth, robust, and high-performance operation of a complex, automated WAN and Core infrastructure spanning five data centers across Germany. As the 'network glue,' you will be responsible for the design, operation, and continuous development of the core network infrastructure, including backbone, routing core, and data center interconnects. You will collaborate closely with other infrastructure teams to consolidate the cloud and network stack, contributing to architecture and design work, and selecting appropriate hardware and software components. Key responsibilities include administering and troubleshooting network resources—configuring and monitoring switches, routers, firewalls, and load balancers—and maintaining comprehensive documentation. This position is ideal for a professional ready to take on significant responsibility in a complex infrastructure environment, actively contributing to the evolution of the network using modern approaches like GitOps and CI/CD pipelines. Strong experience with dynamic routing protocols and core network architectures is essential.

Required Skills

Education

Not specified

Experience

  • Very good experience with dynamic routing protocols (OSPF, IS-IS & BGP)
  • Experience in productive operation with common network products (e.g., Juniper, Arista, and/or Nokia)
  • Deep knowledge of network topologies and core infrastructures, especially network architectures like MPLS/VPLS, VXLAN, IPv6
  • Familiarity with firewall and load balancer vendors, implementation, and management

Languages

German (Fluent)English (Basic)

Additional

  • Participation in on-call duty for the network area (after the probation period)