Senior Networking Engineer (m/f/d) VPN (IPsec)

You want to work deep in the network stack and build the foundation for secure communication instead of just configuring systems? You are interested in how modern network security concepts like IPsec, mTLS, or Zero Trust are implemented on OS level - and want to actively shape them?

Then this role gives you the opportunity to combine system-level development, networking, and platform engineering in a forward-looking environment.

For our CTO Office, where we focus on topics such as technology and platform strategy, innovation and funded projects, IP and product management, as well as the development of our Software Factory and internal tooling landscape, we are looking for your support nearly 100 % remotely.

• Design, develop, and integrate networking and security components with a focus on VPN technologies (especially IPsec) and modern approaches like mTLS or Zero Trust
• Work deep in the network stack on operating system level, including low-level and kernel-related components
• Build and evolve core platform capabilities that enable secure communication in dynamic environments
• Take ownership of networking topics and drive their technical direction within the platform
• Leverage and integrate Open Source software and contribute improvements back upstream (e.g. Linux kernel, systemd, Nix ecosystem)
• Design and implement robust testing strategies (unit, integration, end-to-end) to ensure long-term software quality
• Continuously improve our CI/CD processes, observability, and secure development practices
• Support internal teams in using and building on top of our platform and OS components
   

• University degree in computer science or a related field. Alternatively, you have roughly equivalent experience to a university degree
• Experience in software development with a focus on networking
• Strong understanding of networking concepts and protocols (e.g. TCP/IP, VPN, IPsec; ideally also mTLS or Zero Trust concepts)
• Experience with modern software engineering practices such as automated testing, CI/CD, or observability
• Experience with code reviews, debugging, and maintaining complex software systems 
• Understanding of how cryptography is applied in network security is a plus
• Open Source enthusiast that already enjoys working upstream or is motivated to learn how to
• Experience working close to the operating system (e.g. Linux, network stack, kernel-related or system-level components)
• Proficiency in English (German is a plus, but not required), as our team language is English

You don't meet every single requirement? That's perfectly fine. What matters most to us is your strong foundation in networking and your willingness to dive deeper into system-level development

• Competitive salary: You can expect an annual target salary starting at EUR65,000 gross--and potentially higher depending on your qualifications and professional experience--consisting of an attractive base salary and a performance-based bonus.
• True team spirit: Collaborate in teams that drive change--no matter how complex or extensive the projects are
• Social impact: We work on solutions that are game-changers--across all areas of IT security
• Personal development: At our company, there's no one-size-fits-all approach to career growth. We grow together and support you with whatever you need to advance
• People-Centric: Our strength lies in our diversity. We respect each other just as we are. We also care deeply about balancing work, family, and personal life. We've been certified in this area since 2025
• Flexible Work: 12 locations in Germany, a shared desk model, trust-based working hours, and flexible part-time options. There's a model to suit everyone
• Sun, beach, or mountains: Want to work in another EU country? No problem--you can work remotely within the EU for up to 20 days a year
• Great benefits on top: Look forward to bike leasing, a company fitness program, discounted commuter passes, Secudog, and much more