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

WebHosting; Deutschland; Remote; EUR 110,000 - 140,000; Full time

Job summary

IONOS seeks a Staff Software Engineer to join its Cloud SDN Development team. You will design, implement and optimize the high‑performance SDN stack that connects our customers’ virtual machines and cloud services.

Work across Linux kernel networking, eBPF, and Open vSwitch/OpenFlow pipelines, writing C/C++ and Golang/Python code, and developing tooling to test, deploy and operate the SDN stack in virtualized environments (QEMU/KVM, VirtIO).

Qualifications

• Team-oriented software engineer with strong problem-solving skills.
• Experience in building high-performance networking software.
• Experience collaborating with cross-functional teams.

Responsibilities

• Develop and support the scalable, high-performance SDN stack of IONOS Cloud using a range of diverse technologies.
• Design new features and adopt technologies (hardware and software defined) on SDN components of the infrastructure.
• Write and debug 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.
• Build Python tooling and automation for testing, deployment and operation of the SDN stack, and troubleshoot network issues in virtualized environments (QEMU/KVM, VirtIO).
• Cooperate with other teams to ensure smooth integration of new SDN features with different IONOS products.

Skills

C/C++ programming

Golang

Python scripting

Education

None specified

Tools

C/C++

Golang

Python

Job description

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

Job Description

About IONOS

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.

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.

Application Note

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.