Join Proton and help build a better internet where privacy is the default. Proton was founded in 2014 by scientists from CERN on the belief that privacy is a fundamental human right. Since then, Proton has developed the world’s largest encrypted email service and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar, serving millions globally to protect freedom, fight censorship, and keep data safe. Proton is profitable, independent, and has a team of over 500 members across 50+ countries.
Tasks
- Design, build, maintain, and evolve Proton’s applications on Windows.
- Participate in the entire application lifecycle, including feature design, implementation, CI/CD configuration, deployment, monitoring, and operational incident response.
- Collaborate closely with product managers and engineers across the company to deliver privacy-preserving products.
- Work primarily with a codebase written in .NET and WinUI (C#/XAML), and integrate cross-platform logical core libraries written in Rust.
- Define, maintain, and improve the testing stack, including unit tests, integration tests, and automated GUI tests (using FlaUI).
Requirements
- Strong experience in C# and .NET development.
- Strong experience building and maintaining Windows desktop applications using frameworks such as WinUI, WPF, or similar.
- Solid understanding of MVVM architecture, dependency injection, asynchronous programming (async/await), and event-based messaging patterns.
- Proven ability to write maintainable, well-tested, and scalable codebases.
- Demonstrated experience driving change within an organization and leading complex technical projects.
- Strong understanding of software architecture and engineering best practices.
- Appreciation for user experience and design quality.
- Rust experience is not required but is a significant plus.
- Working knowledge of networking fundamentals (TCP/IP, DNS, routing concepts) and an interest in VPN technologies and protocols.
- Experience with code debugging, profiling, and performance optimization on Windows.
- Familiarity with Git-based workflows, CI/CD pipelines (GitLab), and modern collaborative development practices.
- Experience with gradual rollout and observability tooling (telemetry, metrics, monitoring, and alerting).
Benefits
- Work that matters: millions of people trust Proton with their privacy, and the impact is measurable.
- Diverse, collaborative, and tight-knit team with members from top academic institutions and organizations.
- Access to the right hardware and software to do your best work.
- Investment in learning and development, with real challenges and ownership from day one.
- Strong health coverage, solid retirement options, generous leave, and wellness support.
- Stock options: opportunity to be an owner of the company from day one.
- Lunch and snacks provided daily in the office.
- Transport support: public transport, bike allowances, or parking covered.
- Flexible working: set hours that work for you and your team.
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Über uns
Das Team
The team is small, diverse, collaborative, and tight-knit, with members from leading organizations and elite academic backgrounds. The company values in-person collaboration and maintains a light hierarchy, prioritizing impact.