Staff Software Engineer (f/m/d) Software-Defined Networking / 1648 (Softwareentwickler/in)

Germany | Oct. 20, 2026

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Company: IONOS SE

Country: Germany

Type: Hybrid remote

Employment: Full-time

Description: The IONOS Cloud SDN Development team is seeking a highly motivated and experienced software engineer. The SDN Development team designs, develops and maintains the high-performance Software-Defined Networking (SDN) stack of IONOS Cloud: the networking foundation that connects our customers' virtual machines and cloud services. Our work spans the Linux kernel networking layer, virtual switching and the control plane. We use a range of technologies, from C/C++ and Golang for performance-critical components to Python for tooling and automation.Tasks- Developing and supporting the scalable, high-performance SDN stack of IONOS Cloud using a range of diverse technologies.- Designing new features and adopting new technologies (both hardware and "software defined") on different components of the SDN infrastructure.- Writing and debugging C/C++ and Golang/Python code across the SDN data plane and control plane, from Linux kernel networking and eBPF to Open vSwitch/OpenFlow pipelines.- Building Python tooling and automation for testing, deploying and operating the SDN stack, and troubleshooting network issues in virtualized environments (QEMU/KVM, VirtIO).- Cooperating with other teams to ensure the smooth integration of new SDN features with different IONOS products.Qualifications- Proficiency 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 like BGP, plus networking technologies such as Open vSwitch, OpenFlow, VXLAN, VRF and eBPF.- Experience with cloud environments, Kubernetes and virtualization technologies like QEMU/KVM and VirtIO.- Experience with the GNU toolchain (gcc, gdb, make, etc.), git and the Linux CLI.- Experience with Linux system administration and automation.- Nice to have: experience with VPP and DPDK.Benefits- Hybrid working model.- Flexible working hours through trust-based working hours.- At some locations a subsidized canteen and various free drinks.- Modern office space with very good transport connections.- Various employee discounts for activities and products.- Employee events such as summer and winter parties, as well as workshops.- Numerous training and development opportunities.- Various health offers, such as sports and health courses.

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