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Software Engineer

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Senior Software Engineer

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Senior Frontend Engineer (Pass)

Requirements:

  • 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 TypeScript 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.

Nice to haves:

  • 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 WebAssembly 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.

What you'll be doing:

  • 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.

Perks and benefits:

  • Work that Matters: Millions of people trust Proton with their privacy.
  • A great Team: Our team is diverse, collaborative, and tight-knit.
  • Technology: You'll get the right hardware and software you need.
  • Learning & Development: We invest in your growth.
  • Employee Benefits: Strong health coverage, solid retirement options, generous leave, and wellness support.
  • Stock Options: Opportunity to be owners of the company.
  • In-Person Collaboration: Collaboration opportunities with people who care about what they're building.
  • Food: Lunch and snacks provided.
  • Transport: Public transport, bike allowances, or parking covered.
  • Flexible Working: Set hours that work for you and your team.
AI Summary ✨
Proton logo

Proton

France, Spain

Experience: Senior
Posted: March 30, 2026
Last seen: 3 minutes ago
Javascript
Rust
Typescript
frontend

Why we track Proton

Proton is the company behind ProtonMail and ProtonVPN, headquartered in Geneva. They're building privacy-focused tools used by millions. If you care about security, encryption, and digital privacy, Proton is one of the most mission-driven companies in Europe.

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