Software Engineer – Windows (VPN)

About the role

Join the Windows VPN team to design, build, maintain and evolve Proton’s privacy‑focused applications for Windows, working across the full product lifecycle.

Key responsibilities

• Design, build, maintain and evolve Windows VPN applications.
• Own the full application lifecycle, including feature design, implementation, CI/CD configuration, deployment, monitoring and incident response.
• Collaborate with product managers and engineers across the company to deliver privacy‑preserving products used by millions.

Required profile

• Strong experience in C# and .NET development.
• Proven ability to write maintainable, well‑tested, and scalable codebases.
• Experience driving change and leading complex technical projects.
• Solid understanding of software architecture and engineering best practices.

Required skills

• C#
• .NET
• WinUI / WPF
• MVVM architecture
• Async/await programming
• Rust (optional)
• Networking fundamentals (TCP/IP, DNS, routing)
• Git and GitLab CI/CD pipelines
• FlaUI for automated GUI testing

What we offer

• Impactful work protecting millions of users' privacy.
• Diverse, collaborative team with members from top academic institutions.
• Modern hardware and software tools.
• Learning and development opportunities.
• Comprehensive health coverage, retirement options, generous leave and wellness support.
• Stock options and ownership from day one.
• Office locations in Geneva, Zürich, Barcelona, London and more with lunch, snacks and transport benefits.
• Flexible working schedule focused on outcomes.