Software Engineer

Requirements

• You have hands-on experience building or maintaining a Chromium-based browser, or contributing to browser engineering at scale
• You are proficient in C++ and comfortable navigating large codebases such as Chromium's (Blink, V8, network stack, sandboxing, extensions)
• You have familiarity with Chromium's build system and cross-platform builds (macOS, Windows, Linux)
• You have implemented privacy or security hardening in practice — anti-fingerprinting measures, content blocking, or reducing telemetry and third-party dependencies
• You care deeply about product quality, performance, and delivering a fast, distraction-free user experience
• You have solid knowledge of web platform standards and the security responsibilities of shipping a browser
• You are comfortable navigating ambiguity in a small, high-ownership team, and experience working in open source is a strong plus

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. (read more about our impact here)
• 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.
• 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
• 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.