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Senior Software Engineer (Inbox Desktop)

Proton·Senior·Hybrid · London

Posted Oct 6, 2026·proton.me

The Team

Our business unit, Inbox, is a cross-functional team of about 60 engineers, product managers, designers and data analysts driving the development of Proton Mail, the company’s flagship product, and Proton Calendar. Our mission is to create an end-to-end encrypted solution with a better user experience than any other productivity products on the market.

The Inbox Desktop team is responsible for developing desktop clients of Inbox, specifically the Proton Mail Desktop App, Proton Mail Bridge, and the Export tool. We are in the process of rebuilding our client applications on a new, innovative technology stack centred around cross-platform Rust code. We are looking for a Senior Software Engineer to take the technical ownership of the Proton Mail Desktop App on Windows and Linux platforms.

Job requirements

Experience: Significant, relevant professional software development experience with Rust programming language, or with very strong background in modern C++ and reasonably complex Rust pet projects.
Desktop software development: Experience in developing high quality, fast, Windows and Linux cross-platform desktop applications. Familiarity with different native and cross-platform desktop UI frameworks (e.g. Avalonia UI, Qt, Electron, etc.). Experience in working both on user interface and on business logic.
Product mindset: A product mindset with a focus on offering outstanding user experience in a successful business environment.
Engineering leadership: Ability to make architectural decisions and contribute to strategic planning and product directions.
Collaborative Skills: Proven ability to work collaboratively in a team environment, excellent written communication skills, and experience working in a distributed team.
Problem-solving: Strong problem-solving skills and the ability to troubleshoot customer issues remotely while protecting our user’s privacy.
Security focus: Understanding of secure coding practices and a commitment to maintaining high levels of security and privacy.
Bachelor's or Master's degree: In Computer Science, Software Engineering, or a related field.

The Team

Job requirements

Experience: Significant, relevant professional software development experience with Rust programming language, or with very strong background in modern C++ and reasonably complex Rust pet projects.
Desktop software development: Experience in developing high quality, fast, Windows and Linux cross-platform desktop applications. Familiarity with different native and cross-platform desktop UI frameworks (e.g. Avalonia UI, Qt, Electron, etc.). Experience in working both on user interface and on business logic.
Product mindset: A product mindset with a focus on offering outstanding user experience in a successful business environment.
Engineering leadership: Ability to make architectural decisions and contribute to strategic planning and product directions.
Collaborative Skills: Proven ability to work collaboratively in a team environment, excellent written communication skills, and experience working in a distributed team.
Problem-solving: Strong problem-solving skills and the ability to troubleshoot customer issues remotely while protecting our user’s privacy.
Security focus: Understanding of secure coding practices and a commitment to maintaining high levels of security and privacy.
Bachelor's or Master's degree: In Computer Science, Software Engineering, or a related field.

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