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

1&1 IONOS SE; Berlin; Hybrid; EUR 80,000 - 110,000; Full time

Benefits offered by this job

Hybrid working model

Flexible working hours

Canteen subsidy at some locations

Modern office with good transport

Employee discounts

Job summary

1&1 IONOS SE in Berlin is seeking a highly capable software engineer to join our SDN Development team. You will design, implement and maintain the high-performance SDN stack that underpins our cloud networking, spanning Linux kernel networking, data plane, and control plane.

You will work with C/C++ and Go, contribute to Open vSwitch/OpenFlow pipelines, and build Python tooling for testing and automation in a hybrid work environment with modern offices and flexible hours.

Qualifications

• Proficiency in C/C++ and/or Golang, plus Python, including AI-assisted development.
• Experience with Linux kernel networking internals.
• Knowledge of TCP/IP and routing protocols like BGP; Open vSwitch/OpenFlow; VXLAN, VRF, eBPF.
• Experience with cloud environments, Kubernetes and virtualization technologies like QEMU/KVM and VirtIO.
• Experience with GNU toolchain (gcc, gdb, make), git and 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 on SDN infrastructure components.
• Writing and debugging C/C++ and Golang/Python code across data plane and control plane.
• Building Python tooling and automation for testing, deploying and operating the SDN stack.
• Cooperating with other teams to ensure smooth integration of new SDN features with IONOS products.

Skills

C/C++

Golang

Python

AI-assisted development

Tools

Linux kernel networking

Open vSwitch

OpenFlow

eBPF

QEMU/KVM

VirtIO

Kubernetes

DPDK

Job description

Tasks

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.