Senior Software Engineer, Windows (Drive)

Proton seeks a Senior Windows Engineer to design, build, and maintain its Drive application for Windows, focusing on privacy, performance, and scalability. The role involves full application lifecycle management and collaboration with backend teams.

This role is responsible for developing and evolving Proton’s Windows application, ensuring it delivers a seamless, privacy-focused experience. It covers the entire lifecycle from design and development to deployment, monitoring, and incident response, with a focus on cryptographic operations, state management, and system resilience.

Responsibilities

• Contribute to a small team developing a privacy-first Windows application for Proton Drive.
• Create an intuitive application that simplifies end-to-end encryption for users while maintaining strong privacy guarantees.
• Enhance testing and automation to boost team efficiency and delivery speed.
• Break down complex problems into manageable, reusable components and adjust scope as needed to meet goals.
• Maintain high standards for monitoring and alerting to ensure reliability and a smooth user experience.

Requirements

• Proven experience in .NET development.
• Extensive background in building and maintaining desktop Windows applications.
• Strong skills in concurrent, multi-threaded programming.
• Understanding of file system operations.
• Familiarity with Git version control.
• Bachelor’s or master’s degree in a relevant technical field.
• Track record of owning and maintaining large software components.
• Experience with gradual feature rollouts and monitoring/alerting systems.

What the company offers

• Office First: Work in one of Proton’s offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, or Taipei, with up to 30% remote flexibility and three core days in the office.
• Technology: Proton supplies all required devices and software.
• Food: Daily lunch and snacks provided at offices.
• Transport: Support for commuting via public transport subsidies, bike allowances, or parking, depending on location.
• Stock Options: Employees receive stock options upon joining.
• Flexible Working: Define your own schedule as long as it aligns with team meetings.
• Learning and Development: Access to training, conferences, and ongoing learning opportunities.
• Employee Benefits: Comprehensive health insurance, competitive retirement savings, generous vacation and leave, and wellness programs.
• Work that Matters: Proton is community-driven, funded solely by user subscriptions, and prioritizes user privacy and freedom.

About the company

Proton, founded by CERN scientists in 2014, is committed to privacy as a human right. It offers free and open-source tools like Proton Mail, Proton VPN, Proton Drive, and Proton Pass to empower users against invasive tech practices. With over 100 million accounts and 500+ employees from 50+ countries, Proton values talent, adaptability, and a startup mindset with a flat structure.

• Privacy is seen as a fundamental human right and essential to democracy.
• The company was founded by scientists from CERN and provides open-source tools for online security and freedom.
• Products include Proton Mail, Proton VPN, Proton Calendar, Proton Drive, and Proton Pass, designed to give users control over their data.
• Proton serves over 100 million users and employs more than 500 people from over 50 countries.
• The company prioritizes intelligence, learning potential, ambition, and adaptability in hiring.
• Smaller, high-talent teams are valued over larger, less skilled ones.
• Proton achieved profitability and scale without venture capital, driven by exceptional talent.
• It maintains a global perspective, big ambitions, and a startup culture with a flat hierarchy to enable fast decision-making.