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# Windows Desktop Engineer -.Net, Winui & Vpn

- **Company:** Proton
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Microsoft Windows, C Sharp (Programming Language), Continuous Integration, Extensible Application Markup Language, Virtual Private Networks (VPN), Windows Desktop
- **Published:** September 16, 2026
- **Apply:** https://www.buscojobs.com.es/windows-desktop-engineer-net-winui-vpn-en-madrid-ID-370588665

## About the Role

Experience with .
NET, WinUI (C#/XAML), and Rust core libraries is ideal.
You'll also help advance testing stacks (unit, integration, GUI tests) with FlaUI and CI/CD pipelines.
#J-*****-Ljbffr

## Description

Proton is seeking an engineer to design, build, and evolve Windows applications.You will own the full lifecycle from feature design to deployment, monitoring, and incident response.The role emphasizes collaboration with product teams to deliver secure, privacy-preserving software.Experience with .NET, WinUI (C#/XAML), and Rust core libraries is ideal.You'll also help advance testing stacks (unit, integration, GUI tests) with FlaUI and CI/CD pipelines.#J-*****-Ljbffr