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

IONOS Group; Berlin; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Hybrid working model

Flexible working hours

Subsidized canteen at some locations

Modern office with excellent transport

Employee discounts

Employee events like summer/winter t​​

Training and development opportunities

Health offers such as sports and well‑

Job summary

IONOS Group's Cloud SDN Development team seeks a highly motivated software engineer to design, build and maintain the high‑performance SDN stack that underpins the IONOS Cloud networking. You will work across Linux kernel networking, virtual switching and the control plane, coding in C/C++ and Golang, with Python tooling for testing, deployment and automation.

The role requires hands‑on experience with Open vSwitch, OpenFlow, VXLAN, eBPF, QEMU/KVM and cloud virtualization, plus the GNU toolchain

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.

Responsibilities

• 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.

Skills

C/C++

Golang

Python

Linux kernel networking

AI-assisted development

Open vSwitch

OpenFlow

VXLAN

VRF

eBPF

QEMU/KVM

VirtIO

GNU toolchain

Git

Linux CLI

Kubernetes

Cloud environments

Tools

QEMU/KVM

VirtIO

Git

Open vSwitch

OpenFlow

eBPF

VXLAN

GCC/GDB/Make

Job 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.