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Senior Rust Engineer (Foundation), London

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Client:

ProtonMail

Location:

London, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Reference:

ba16cb64a7ce

Job Views:

8

Posted:

15.07.2025

Expiry Date:

29.08.2025

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Job Description:

A betterinternet, where privacy is the default, is possible. Building this better internet might seem daunting or even unthinkable, but at Proton, this is what we do every day.

Proton was founded in 2014 by a group of scientists who met at the European Organization for Nuclear Research (CERN). Our first product,Proton Mail, is now the world’s largest encrypted email service. Subsequent Proton products, such asProton VPN,Proton Calendar,Proton Drive, and Proton Pass give our users full control over how and with whom their data is shared.

Today, Proton makes privacy universally accessible. Journalists from outlets likeThe GuardianandThe New York Times, some of the world’s largest organizations, and people in more than 180 countries have signed up for over 100 million accounts. Our diverse and dynamic team is made up of more than 400 members representing over 40 different nationalities. While we are based in Geneva, Switzerland, we have offices in Zurich, Prague, London, Vilnius, Skopje, Taipei, Barcelona, Paris and many more employees working remotely around the world.

Join one of Europe’s fastest-growing companies to help us solve challenging problems and build new products that will reach hundreds of millions of people. We want to create more than just one of the world’s most impactful tech companies; we want to create a new internet that serves the interests of all people. We need you, your voice, your ideas, and your ambition to make it happen.

Purpose of the role:

As a Rust Developer on the foundation team, you will play a crucial role in designing, implementing, and maintaining the foundational components that power Proton mobile and web applications. You will work collaboratively with cross-functional teams, 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 shared libraries: Lead the design and development of Rust libraries that will be shared across web and mobile applications.
• Code review and optimization: Conduct code reviews and provide constructive feedback to ensure code quality, maintainability, and performance optimization.
• Collaboration: Work with frontend and mobile developers to integrate libraries seamlessly into Proton's applications.
• Testing: Develop and implement comprehensive testing strategies, including unit tests and integration tests.
• Documentation: Create and maintain thorough library documentation to assist other developers in understanding and utilizing the components.

Job requirements:

• Experience: 3+ years of professional software development experience, with a focus on Rust programming language.
• Rust proficiency: Strong expertise in Rust language features, concurrency, and ownership model.
• Web and/or mobile development: Experience in developing libraries for both web and mobile applications.
• Collaborative skills: Proven ability to work collaboratively in a team environment and excellent communication skills.
• Problem-solving: Strong problem-solving skills and the ability to troubleshoot issues efficiently.
• Bachelor's or Master's degree: In Computer Science, Software Engineering, or a related field.
• Experience with DDD (Domain-Driven Design) and other enterprise patterns.
• Experience with web-assembly.
• High-level understanding of cryptography concepts such as key exchange and the difference between symmetric and asymmetric encryption.
• Experience with Docker or similar containerization technologies.

Why should you join Proton?

• Be part of a movement -Proton is not just a product or service but a community-driven movement united by a shared vision of online freedom. Our services are open source, audited, and supported by community contributions. We give back to our community by maintaining core encryption libraries and by supporting other organizations furthering the same goals as us.Proton is free, open source, neutral, independent, and community first, while remaining financially sustainable.
• Work with smart and dedicated people -Our team is diverse, collaborative, and tight-knit with people coming from all walks of life, including many of the world’s top academic institutions and organizations, such as MIT, Harvard, Stanford, Caltech, Cambridge, and ETH.
• Join a strong brand -Our encrypted email service - ProtonMail - has grown to be a staple of online security and privacy. Proton has been featured in multiple popular television and film productions, such as Mr. Robot, Knives Out, Sounds of Metal, and more.
• Grow with us -We’re one of Europe’s fastest-growing startups, doubling in size every year. Our growth gives you limitless career and educational opportunities as well as the opportunity to work side-by-side with many world-leading experts in their fields.
• Have your voice heard -We value your opinion and encourage you to speak up and share your ideas and thoughts. At Proton, no problem is someone else’s problem. We collectively strive to do the right thing and be the undisputed best in the world at everything we do.
• Benefits –these vary by location and type of contract but expect support on your vacation, parental leave, refreshment if working from the office, learning and development opportunities, equity for shared success, flexible working hours and remote work, company events and team building activities.

Proton does not accept unsolicited resumes from any sources other than directly from a candidate. Proton will not pay a fee for any placement resulting from the receipt of an unsolicited offer, even in a situation when the relevant candidate is employed by Proton.