Staff Software Engineer (f/m/d) Virtual Network Functions

About the Position

At IONOS, the leading European provider of cloud infrastructure, cloud services, and hosting services, you will work together with a wide range of teams. We are characterized by open structures, a friendly working culture, and flat hierarchies with a strong team spirit. We firmly believe that work and fun are compatible, and offer you the right environment for this. Our constant growth means that we are always looking for new colleagues. Become part of IONOS and grow with us.

The IONOS Cloud VNF Development team is seeking a highly motivated and experienced software engineer. The VNF Development team designs, develops, and maintains the Virtual Network Functions (VNF) behind IONOS Cloud's network offerings. These products serve both our external customers and other internal IONOS teams. We build our VNFs in Golang and run them on Kubernetes, so the team works across the whole lifecycle: architecture, implementation, deployment, and day-to-day operations. As part of the team, you'll play a crucial role in shaping and running these products.

We are looking for someone to join our team and work with us on providing the best VNF products possible.

Responsibilities

• Developing and supporting our multiple modern, scalable, and high-performance Virtual Network Functions (VNF) offerings 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 VNF infrastructure.
• Writing, testing, and reviewing Golang services for our VNFs, using AI-assisted tooling as part of your daily development workflow.
• Deploying, operating, and troubleshooting VNF workloads on Kubernetes, including cluster operations, upgrades, monitoring, and debugging network issues in production.
• Cooperating with other teams to ensure the smooth integration of new Virtual Network Functions with different IONOS products.

Requirements

• Proficiency in Golang and/or C/C++, including AI-assisted development.
• Hands-on experience with Kubernetes architecture and operations; knowledge aligned with CKA (Certified Kubernetes Administrator) principles.
• Knowledge of the TCP/IP protocol family and networking technologies such as Open vSwitch, OpenFlow, VXLAN, VRF, and eBPF.
• Experience with cloud environments and virtualization technologies like QEMU/KVM.
• Experience with the GNU toolchain (gcc, gdb, make, etc.), git, and the Linux CLI.
• Experience with Linux system administration and automation.

Nice to Have

• Linux kernel networking internals
• VPP
• DPDK

We Offer

• 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.

About the Company

IONOS is the leading European digitalization partner for small and medium-sized businesses (SMB). The company serves around six million customers and operates across 18 markets in Europe and North America, with its services being accessible worldwide. With its Web Presence & Productivity portfolio, IONOS acts as a 'one-stop shop' for all digitalization needs: from domains and web hosting to classic website builders and do-it-yourself solutions, from e-commerce to online marketing tools. In addition, the company offers Cloud Solutions to enterprises who are looking to move to the cloud as their businesses evolve.

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.