Senior Front-End Developer (Product Extension)

Job description

A better internet is possible, one that empowers people to choose how their personal information is used. This might seem daunting, or even impossible, but at Proton, building this better internet 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 as Proton VPN, Proton Calendar, and Proton Drive, use end-to-end encryption that gives our users full control over how and with whom their data is shared.

Today, Proton is making privacy universally accessible to more than 50 million registered users, including journalists, some of the world’s largest organizations, and people in more than 180 countries. Our diverse and dynamic team is made up of more than 400 members representing over 30 different nationalities. While we are based in Geneva, Switzerland, we have offices in Zurich, Prague, London, Vilnius, Skopje, Taipei, and many more employees working remotely around the world.

New York Times journalists, some of the world’s largest corporations, and millions of ordinary citizens use our products so they can choose who, if anyone, sees their information. Join us at 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

At Proton we want to keep improving the foundation upon which our products grow. To do so we’re exploring using browser extensions for our products. As part of the product team you will help develop the current foundation, create a new foundation to build web extensions, and improve and build proton products for the web.

As the first front-end developer on this team you will be in charge of building the web extension foundation, use it to build extensions integrated with the web clients for the projects that require. You will also collaborate with the other front-end developers to solve complex technical and user-experience challenges. Proton front-end team works cross-functionally with Product, Engineering, and Security teams to build and operate a secure, scalable and performant system across our suite of products.


What you will do

  • Work closely with teammates in order to design, build, test, optimize our web extension and web app.

  • Develop high-quality customer experiences on the web.

  • Write readable, maintainable, tested, and well-documented code.

  • Ensure that acceptance criteria and all parts of the technical design are correctly incorporated.

  • Follow and promote engineering best practices.

  • Take part in team activities, such as sprint ceremonies, code reviews, and pair programming.

  • Share your unique knowledge and skills with the rest of the team.

  • Bootstrap a new foundation within our codebase to build web extensions.

  • Implement web-extensions for the projects that require it.

  • Develop the web clients and integrate the extension for proton projects

Job requirements

You are a top candidate if you have

  • 5+ years of experience using JavaScript and working on concepts such as asynchronous programming, closures, and ES6, at a minimum.

  • 3+ years of experience using React.

  • Proven proficiency with TypeScript.

  • Experience using RESTful APIs.

  • Experience testing your own code using automated tests, writing unit tests at a minimum (e.g. using Jest, Mocha, Cypress, Playwright).

  • A product mindset and you are committed to building the best user experience.

  • Ability to thrive in a dynamic, fast-paced, and collaborative environment.

Bonus points for:

  • Experiences building browser extensions that play nicely with Chromium and Firefox browsers.

  • Well versed in security and with a good understanding of security best practices from an application development standpoint.

  • Experience using DevOps processes and practices (including CI/CD).

  • Experience working in a distributed team.


Why you should 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.
  • 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 - Proton Mail - 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.


Proton uses the Recruitee recruitment platform for a more effective hiring process and a better candidate experience. Your data will always be kept confidential and is not shared with any third parties. Keep in mind that you will receive emails from the email address careers@protonmail.recruitee.com or other addresses on the protonmail.recruitee.com domain.


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.