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Senior Frontend Engineer (Inbox Web)

Proton
Francefull_timeVerifiedPosted 25 Jul 2025

About the role

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 today supports 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. We believe smaller teams of exceptional talent will always prevail over larger teams with lower talent density. Proton has become profitable and reached scale without relying upon VC funding, largely due to superior talent that allows us to do things faster, more creatively, and more efficiently.

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 social media pages to learn more about us: TwitterRedditInstagram.

The Team

As a Frontend Engineer on the Inbox team, you will play a crucial role in developing Proton's most vital services, including Mail and Calendar. We expect you to be customer-centric, continuously learning, passionate about technology and usability. You are an adept at turning technical complexities into seamless user experiences. Effective teamwork, collaboration with Product, Design, APIs, and your team, and data-driven decision-making are essential aspects of this role. 

Current Projects:

  • Developing innovative productivity tools that seamlessly integrate with our privacy-centric ecosystem.
  • Advancing the frontiers of cryptography to ensure user data remains secure even in the face of emerging technologies such as quantum proof encryption.
  • Expanding Proton's reach into the B2B segment, bringing privacy and security to businesses worldwide.
  • Pushing the boundaries of innovation with projects like Scribe, the world's first private AI in a consumer product.

Tech Stack and Tools:

  • Javascript, Typescript, React, ES6
  • Every Proton clients codebase are open source, https://github.com/ProtonMail/WebClients
  • Encryption brings unique challenges to front-end development. A trivial search functionality becomes much more interesting to implement when the email body is fully encrypted.

What you will do

  • Developing, deploying and supporting high-quality user experiences within our Product portfolio including feature development and implementation.
  • Transforming product specifications into technical requirements and lead your team to their successful implementation.
  • Enhancing Proton's software development lifecycle, tools, and code structure for an improved developer experience through technical leadership and architecture.
  • Writing clear, concise and testable code to maintain and elevate the quality of our codebase.
  • Managing the scoping, planning and execution of new features, technical initiatives and greenfield projects (depending on seniority).
  • Fostering a culture of learning, creativity, and accountability for the best possible work through mentorship and team development, role modelling quality assurance and performance optimisation

Job requirements

While we prefer candidates who cover the entire skillset, don't hesitate to apply if you're not an exact match, as we're willing to help you grow in certain areas.

  • Extensive experience of professional software developmen

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Company

Proton

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