Windows Software Engineer (VPN)

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.
• A strong understanding of software architecture and engineering best practices.
• An 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).

What You'll Be Doing

• Designing, building, maintaining, and evolving Proton’s applications on Windows.
• Collaborating closely with product managers and engineers across the company to deliver privacy-preserving products used by millions of people worldwide.
• Defining, maintaining, and improving testing stack including unit tests, integration tests, and automated GUI tests.

Perks and Benefits

• Office First: Collaboration in person, with offices in multiple cities.
• Technology: Provided devices and software to excel in your role.
• Food: Daily lunches and snacks provided by Proton.
• Transport: Support for transport costs through various means.
• Stock Options: Ownership of the company through stock options.
• Flexible Working: Define your own working hours with team meetings in mind.
• Learning and Development: Various learning opportunities for professional growth.
• Employee Benefits: Comprehensive health insurance, retirement savings, vacation policies, and wellness programs.
• Work that Matters: A community-first organization supporting user privacy.