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

secunet Security Networks AG; Essen; Hybrid; EUR 59.000 - 72.000; Vollzeit

Benefits dieser Stelle

Competitive salary

Flexible work options

Remote within EU (up to 20 days)

Bike leasing

Fitness program

Zusammenfassung

secunet Security Networks AG in Essen is building a Core Platform and seeks a versatile engineer to design, develop, and integrate novel components, push toward the next-generation assets, and strengthen the security foundations used by product teams.

You will work with Rust, Linux (NixOS), and Nix tooling, contribute upstream, improve CI, and help secure device onboarding, network connections, and trust strategies while growing your expertise in modern software security.

Qualifikationen

• University degree in computer science or equivalent experience.
• Hands-on experience with modern Linux features.
• Motivation to work on the leading edge of software security.
• Interest in fuzzing, property-based testing, or reproducible builds.
• Open Source enthusiast with willingness to upstream.
• Proficient in English (German optional).

Aufgaben

• Design, develop, and integrate novel components for security-related tasks (e.g. SPIFFE/SPIRE, mTLS, IPSec, FIDO onboarding).
• Maintain and enhance our Rust-based software.
• Contribute fixes and improvements upstream in Open Source projects (Nixpkgs, Linux kernel, systemd).
• Write automated tests (unit, integration, end-to-end).
• Improve CI processes with metrics and observability, emphasizing secure development.
• Support internal teams in using core assets to build products.

Kenntnisse

Linux experience

Rust

Open Source contribution

English proficiency

Ausbildung

Bachelor's in Computer Science

Tools

NixOS

Nix

GitLab

Jobbeschreibung

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.

Our tech stack:

• 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

Your tasks

• 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

Get in touch with us

secunet Security Networks AG
Nicole Schulz
Kurfürstenstraße 58
45138 Essen
Phone: [phone]