Frontend Engineer (Inbox Web) in London

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

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 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.

Key responsibilities

• Take end‑to‑end ownership of mobile application development projects: you’ll be comfortable with scoping projects, walking back from deadlines and being able to discern the important from the superfluous.
• Foster a culture of innovation by exploring new technologies, methodologies and approaches to web development – we tackle complex engineering challenges with creativity and ingenuity.
• Design for scalability, considering factors such as data caching, network bandwidth and server load.
• Implement solutions to monitor and alert the team regarding the state of Inbox web clients.
• Prioritize customer satisfaction by maintaining a customer‑centric mindset throughout the development process, continuously seeking feedback and iterating to improve the user experience.

Tech Stack and Tools

Javascript, TypeScript, React, Symfony, Rust.

Every Proton client codebase is open source. 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

• Develop new features: Developing, deploying and supporting high‑quality user experiences, including feature development and implementation.
• Drive adoption and user retention: you will contribute to the user onboarding and delivering a delightful experience to retain.
• Collaboration: Work closely with backend, product owners, designers, QA, and other engineers to take initiatives from ideation to completion.
• Code review and optimization: Conduct code reviews and provide constructive feedback to ensure code quality, maintainability, and performance optimization.
• Testing: Develop and implement comprehensive testing strategies, on all test layers to ensure reliability and future ease of development.

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 development using JavaScript or TypeScript.
• Experience with React or 2+ similar frameworks, developing performant and reusable components.
• Experience contributing to an API codebase, bonus points if in PHP.
• Experience writing tests at scale.
• Familiarity with other best practices for ensuring code quality, including CI/CD.

Nice to have

• Experience with monitoring and observability tools.
• Experience working in a distributed team.
• Awareness of common security issues in client‑side development, such as those in the OWASP top ten, and how to mitigate them.
• Familiarity with UX, accessibility, internationalization, and localization concerns and solutions.

What We Offer

• Office First: Collaboration is easier and more effective in person, which is why we have offices in Geneva, Zurich, Prague, Barcelona, Paris, London, Vilnius, Skopje, and Taipei. You can also enjoy working from home up to 30% of the time, while enjoying great company during our three core days in the office.
• Technology: We provide all the devices and software you need to excel in your role, ensuring you have the best tools at your disposal to achieve your goals.
• Food: Lunch and snacks are provided by Proton every day at our offices.
• Transport: We will always support our employees with transport costs through subsidizing public transport, bike allowances, or parking spaces based on your office location.
• Stock Options: At Proton, we are all owners of the company and you get stock options when you join us.
• Flexible Working: You can define your own working hours as long as it works with team meetings.
• Learning and Development: We are committed to your professional growth. Proton offers various learning opportunities, including training programs, conferences and events, and continual learning.
• Employee Benefits: Comprehensive health insurance plans, competitive retirement savings options, generous vacation and leave policies, and wellness programs.
• Work that Matters: Proton is a community‑first organization, started with the support of a crowdfunding campaign and built with community input. To this day, Proton’s only source of revenue is user subscriptions. Over 100 million people trust and support Proton, and we put our users and community first in everything we do.

Our Commitment to Diversity and Inclusion

At Proton, we believe diversity drives innovation and strengthens our mission to provide privacy as a default for all. We are committed to fostering an inclusive environment where all individuals, regardless of race, ethnicity, gender, age, sexual orientation, physical ability, or socio‑economic background, feel valued and empowered. We strive to create equal opportunities, promote open dialogue, and support continuous learning to ensure every voice is heard and respected.