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About the Role

The IONOS Cloud SDN Development team designs, develops, and maintains the high-performance Software-Defined Networking (SDN) stack, which serves as the networking foundation connecting virtual machines and cloud services. This role involves working with Linux kernel networking, virtual switching, and control plane technologies, utilizing languages like C/C++, Golang, and Python.

Responsibilities

Developing and supporting the scalable, high-performance SDN stack of IONOS Cloud using diverse technologies.
Designing new features and adopting new technologies (hardware and software-defined) across SDN infrastructure components.
Writing and debugging C/C++ and Golang/Python code for the SDN data plane and control plane, including Linux kernel networking, eBPF, Open vSwitch, and OpenFlow pipelines.
Building Python tooling and automation for testing, deploying, and operating the SDN stack.
Troubleshooting network issues in virtualized environments (QEMU/KVM, VirtIO).
Cooperating with other teams to ensure smooth integration of new SDN features with IONOS products.

Requirements

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.
Knowledge of 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.
Experience with VPP and DPDK is a plus.

Skills

C/C++
Golang
Python
AI-assisted development
Linux kernel networking
TCP/IP
BGP
Open vSwitch
OpenFlow
VXLAN
VRF
eBPF
Cloud environments
Kubernetes
QEMU/KVM
VirtIO
GNU toolchain
git
Linux CLI
Linux system administration
Automation
VPP
DPDK

Location

IONOS Cloud

Work Type

Hybrid working model
Flexible working hours

Benefits

Hybrid working model.
Flexible working hours through trust-based working hours.
Subsidized canteen and various free drinks at some locations.
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.

About the Company

At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions.
As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools.
What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises.
We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit.
Ready for your next step? Become part of IONOS and grow with us.

Equal Opportunity

We value diversity and welcome all applications – regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.