Staff Software Engineer (f/m/d) Software-Defined Networking

Description

The company is IONOS, a hosting provider in Europe that also builds independent cloud services, including sovereign cloud setups, GPU clusters and AI automation tools. It serves more than 6.2 million customers worldwide, from small and medium-sized businesses to large enterprises.

The IONOS Cloud SDN Development team builds and maintains the Software-Defined Networking stack behind IONOS Cloud, which connects customers' virtual machines and cloud services. The team works on the Linux kernel networking layer, virtual switching and the control plane, using C/C++ and Golang for performance-critical parts and Python for tooling and automation.

The team is looking for an experienced software engineer to join it.

Responsibilities

• Develop and support the scalable, high-performance SDN stack of IONOS Cloud across a varied set of technologies.
• Design new features and bring in new technologies, both hardware and software-defined, across the SDN infrastructure.
• Write and debug C/C++ and Golang/Python code for the SDN data plane and control plane, covering Linux kernel networking, eBPF and Open vSwitch/OpenFlow pipelines.
• Build Python tooling and automation to test, deploy and operate the SDN stack.
• Troubleshoot network issues in virtualized environments such as QEMU/KVM and VirtIO.
• Work with other teams so new SDN features integrate smoothly with different IONOS products.

Requirements

• Strong skills in C/C++ and/or Golang, plus Python, including AI-assisted development.
• Experience with Linux kernel networking internals.
• Knowledge of the TCP/IP protocol family and routing protocols such as BGP, plus networking technologies including Open vSwitch, OpenFlow, VXLAN, VRF and eBPF.
• Experience with cloud environments, Kubernetes and virtualization technologies such as QEMU/KVM and VirtIO.
• Experience with the GNU toolchain (gcc, gdb, make and similar), git and the Linux command line.
• Experience with Linux system administration and automation.
• Optional: experience with VPP and DPDK.

Conditions

Hybrid working model.

Flexible hours based on trust-based working time.

Equal opportunity: applications are welcome from everyone, regardless of background or personal characteristics, subject to applicable law.

Benefits

• Subsidized canteen and free drinks at some locations.
• Modern office with very good transport links.
• Employee discounts on activities and products.
• Employee events such as summer and winter parties and workshops.
• Many training and development opportunities.
• Health offers such as sports and health courses.