Senior Software Engineer (m/f/d) - Core Platform

Stellenbeschreibung:

We’re building a Core Platfrom that provides core assets (components) to product teams within secunet. While we currently have an emphasis on appliance-based systems, we’re looking for a versatile engineer that can work in the current ecosystem but also push towards the next - developing components we haven’t even thought of.

NixOS and thus Linux as the basis for anything that needs an OS
Rust for all components we develop
Nix as our meta buildsystem
NixOS VM test framework as the basis for all our integration tests
GitLab as the control plane for our development
Design, develop, and integrate novel components for example for establishing trust (e.g. SPIFFE/SPIRE), securing network connections (e.g. mTLS, IPSec), and secure device onboarding (e.g. FIDO Device Onboarding).
Maintain and continally enhance our existing software written in Rust
Contribute fixes and improvements upstream in Open Source projects (e.g. Nixpkgs, Linux Kernel, systemd)
Write automated tests (unit, integration, end-to-end) for each feature we ship to ensure consistent quality
Continually improve our CI process, integrating metrics and observability, with a keen eye for secure development processes
Support internal departments/teams in using our core assets to build products on top of them

Your Profile

University degree in computer science or a related field. Alternatively, you have roughly equivalent experience to a university degree
Hands-on experience and understanding of modern Linux features
Motivation to work on the leading edge of software security
Enjoy continually learning about emerging software development practices like fuzzing, property-based testing, or reproducible builds
Open Source enthusiast that already enjoys working upstream or is motivated to learn how to
Proficient in English (German is an optional bonus)

Nice To Have

Hands-on experience with networking concepts and protocols: VPN, firewalls, TCP/IP, Zero Trust, mTLS
Good understanding of modern cryptography and it's role in network security

What we offer

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
Competitive salary: You can expect an annual target salary starting at €65,000 gross—and potentially higher depending on your qualifications and professional experience—consisting of an attractive base salary and a performance-based bonus.
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