Senior Frontend Engineer
Browser Extensions, Desktop Applications
Location
Paris, France
Work type
Hybrid
Employment
Full Time
Experience
5-8 years
Compensation
Compensation not disclosed
Posted
13h ago
Summary and responsibilities
Role overview
Summary
The Senior Frontend Engineer will develop and implement high-quality user experiences across web, browser extensions, and desktop applications for Proton Pass. This role involves close collaboration with cross-functional teams, conducting code reviews, and developing comprehensive testing strategies to ensure product reliability.
What you will do:
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.
Job 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.
Bonus points for:
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 We Offer:
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 growth because sharp people make us better. Proton is one of the fastest ways to accelerate your career because you'll be thrown into real challenges, with real ownership, from day one.
Employee Benefits: your wellbeing isn't an afterthought. We offer strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day
Stock Options: at Proton, we all have the opportunity to be owners of the company. From day one, you have a real stake in what we're building. When Proton wins, you win.
In-Person Collaboration: Amazing things happen when passionate, smart, and purposeful people get together in the same room. With offices across Geneva, Zürich, Barcelona, London and more, you'll spend most of your time collaborating face-to-face with people who genuinely care about what they're building
Food: Lunch and snacks are on us every day in our offices so you can focus on the work and not on what's for lunch.
Transport: getting to the office shouldn't cost you. We cover public transport, bike allowances, or parking, whichever works for you.
Flexible Working: you own your schedule. Set hours that work for you and your team — because outcomes matter more than when the clock says you started.
Updated 13h ago
Candidate fit
Skills and qualifications
Additional skills
Experience
5-8 years
How this role is positioned
Role classification
Job domains
Industries
Employment
Full Time
Contract duration
Permanent
Hiring type
Direct
Global hiring
Location specific
Offer details
Compensation and benefits
Compensation
Compensation not disclosed
Benefits and perks
Location, schedule, and role shape
Work setup
Work conditions
Bandwidth profile
Context on the employer
Company snapshot
Company
Proton
Team size
Growing team
Location
Paris, France
Proton, founded in 2014 by CERN scientists, builds privacy-focused internet tools like Proton Mail, VPN, Drive, Pass, and Calendar. They are profitable, independent, and hire top talent globally, focusing on meaningful work and impact.
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Senior Frontend Engineer
Paris, France • Full Time