Senior Frontend Engineer; Pass

Senior Frontend Engineer

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

Proton was founded in 2014 by scientists from CERN on a simple truth: privacy is a fundamental human right. Since then, we've built the world's largest encrypted email service (Proton Mail) and expanded into Proton VPN, Proton Drive, Proton Pass, and Proton Calendar—tools used by millions globally to protect their freedom, fight censorship, and keep their data safe. In some situations, Proton has literally helped save lives!

We are profitable, independent (no VC control), and selectively hire from the top ~1% of applicants. Our 500+ team members across 50+ countries come from leading organizations and elite academic backgrounds. We move fast, keep hierarchy light, and prioritize impact over optics. If you want to do meaningful work with exceptionally high-caliber people, this is it. Join us and do work you can truly be proud of.

Check our open-source projects here!

Proton Pass is a secure, open-source password manager developed by Proton—the team behind Proton Mail and Proton VPN. Built with end-to-end encryption and a strong commitment to privacy, Proton Pass helps individuals and teams safely manage passwords, 2FA codes, notes, and more. As part of the Proton ecosystem, it integrates seamlessly with other privacy-first tools, ensuring robust protection for your digital identity.

We're seeking an experienced developer working across multiple web platforms including browser extensions, web and desktop applications. This role requires both front-end expertise and deep technical knowledge of browser internals, extension APIs, and desktop application frameworks.

• Develop new features:
  Developing, deploying and supporting high-quality user experiences, including feature development and implementation.
• Collaboration:
  
  Work closely with backend, product owners, designers, QA, and other engineers to take initiatives from ideation to completion. Break down large initiatives into smaller milestones to gather stakeholder feedback quickly.
• 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, including unit tests and end-to-end testing tests, to ensure the reliability of the Proton Pass product.

• Proven front-end expertise with deep technical knowledge of browser internals, extension APIs, and desktop application frameworks.
• Deep understanding of the JavaScript ecosystem.
• Proficiency with Type Script or type-safe programming paradigms.
• Strong understanding of software engineering best practices, design patterns, CI/CD.
• A product mindset with a focus on offering the best user experiences.
• Experience working in a distributed team.

• Experience with modern MV3 browser extension development.
• Experience with Electron or similar desktop application frameworks.
• Experience with browser extensions and/or cross-platform web applications.
• Experience working with service-worker architectures.
• Experience with Web Assembly and/or Rust.
• Experience with breaking down product requirements into architecture design and implementation.
• Experience with event-driven systems.
• Familiarity with UX, accessibility and localization concerns.
• Experience with application monitoring strategies.
• High-level understanding of cryptography concepts such as key exchange and the difference between symmetric and asymmetric encryption.

• Work that matters:
  Millions of people trust Proton with their privacy. We answer only to our users—not advertisers, not investors with conflicting agendas, not governments. The work you do here is real, and the impact is measurable.
• A great team:
  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.
• Technology:
  You'll get the right hardware and the right software you need to do your best work.
• Learning & Development:
  We invest in your…