Frontend Engineer (Inbox Web)

Frontend Engineer – Inbox 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. You are expected to be customer‑centric, continuously learning, passionate about technology and usability, adept at turning technical complexities into seamless user experiences, and capable of effective teamwork, collaboration with Product, Design, APIs, and your team, and data‑driven decision‑making.

Key Responsibilities

• Take end‑to‑end ownership of mobile application development projects: scoping projects, walking back from deadlines and discerning the important from the superfluous.
• Foster a culture of innovation by exploring new technologies, methodologies, and approaches to web development.
• Design for scalability, considering 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

• Proton clients’ codebases are 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: contribute to user onboarding and deliver a delightful experience to retain users.
• 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 across 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; 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.
• Technology: we provide all the devices and software needed to excel in your role.
• Food: lunch and snacks are provided by Proton every day at our offices.
• Transport: we support employees with transport costs through subsidizing public transport, bike allowances, or parking spaces based on your office location.
• Stock Options: at Proton, all employees are owners of the company and receive stock options when they join.
• Flexible Working: you can define your own working hours as long as it works with team meetings.
• Learning and Development: we offer training programs, conferences and events, and continual learning opportunities.
• 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; read more about our impact online.

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.

Candidate Privacy Notice

When you apply for a position, refer a candidate, or are considered for a role at Proton Technologies AG, your information is stored in Greenhouse, in accordance with their Service Privacy Policy. This information is used to evaluate your suitability for the posted position and is retained for consideration for future roles that may align with your background and skills. If we no longer have a legitimate business need to process your information, we will either delete or anonymize it. For inquiries, contact our privacy team at

Proton does not accept unsolicited resumes from any sources other than directly from candidates. We will not pay a fee for any placement resulting from an unsolicited offer, even if the candidate is subsequently hired by Proton.