Senior Rust Engineer (Inbox)

Join Proton and build a better internet where privacy is the default

At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online.

Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech’s invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive information. In some cases, Proton’s services have even been instrumental in saving lives by enabling secure and private communications in high-risk situations.

Proton is a profitable company that does not rely upon VC funding, supporting over 100 million user accounts with a growing team of over 500 people from over 50 different countries, from the world's top companies and universities. We value intelligence, learning potential, and ambition in our hiring process. Adaptability is key as we navigate uncharted territories and redefine how business is conducted online.

Hiring at Proton is highly selective, with less than 1% of candidates hired. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. You will have the opportunity work with many of the world's top minds in their fields, ranging from former international math and science olympiad winners to chess champions.

We have a global mindset and big ambitions but remain a start-up at heart. We value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics. Tired of blending into the crowd? Join us and do work you can truly be proud of. Check our open-source projects here!

The Inbox Team:

Become part of the team that drives the development of Proton Mail and Proton Calendar.

We are a cross-functional team of (ballpark figure) 60 engineers, product managers, designers and data analysts responsible for Proton Mail, our flagship product line, and Calendar. We are committed to constantly pushing the boundaries of what we can achieve. It’s not always an easy journey, but it’s one that offers the chance to create meaningful impact and drive lasting change.

Tech Stack and Tools:

Swift & SwiftUI on Apple, Kotlin & JetPackCompose on Android, Rust, C.
All our client-code is open-source and GPL3.
Our backend runs on premise in Proton's data-centers.
To organize our work we use classic tools such as Jira and Confluence.

Future plans:

We are in the process of rebuilding our client applications on a new, innovative Technology Stack.

Purpose of the role:  

As a Rust Developer on our Inbox team, you will play a crucial role in designing, implementing, and maintaining components that power Proton Mail and Calendar platforms. You will work collaboratively in a cross-functional team, including backend API, web frontend, and Android/iOS mobile developers, to ensure seamless integration and optimal performance across various client applications.

What you will do: 

• Architect and develop core libraries: Lead the design and development of core Rust libraries that serve as the backbone for Proton Mail's web and mobile applications.
• Cross-platform compatibility: Ensure compatibility and optimal performance across various platforms, including web browsers and mobile devices.
• Code review and optimization: Conduct code reviews and provide constructive feedback to ensure code quality, maintainability, and performance optimization.
• Collaboration: Work closely with frontend and mobile developers to integrate core libraries seamlessly into Proton Mail's applications.
• Security: Implement and adhere to best practices in secure coding to maintain the high level of security and privacy Proton Mail is known for.
• Testing: Develop and implement comprehensive testing strategies, including unit tests and integration tests, to ensure the reliability of core libraries.
• Documentation: Create and maintain