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
The Foundation Team
The Foundation team builds what the product teams build on: the shared backend framework, the internal libraries,



the common services and abstractions that every Proton application reaches for. If several teams need it, it should exist once, and be good.
You will work in PHP for API related work, and in Rust for components where performance and memory safety justify it or for microservices. You will own libraries or initiatives end to end: design, implementation, documentation, versioning, and the migration path for everyone already depending on the old version.
Architecture is a large part of this role. Many engineers work in the same monorepo, which means module boundaries, dependency direction, and ownership are not academic concerns — they decide whether the codebase stays navigable or slowly turns into something nobody can change safely. You will help define those boundaries, make the structural calls that keep teams from stepping on each other, and do some work to enforce them: writing the RFC, adding rules, untan

📌 Senior Backend Engineer (Barcelona)
🏢 Proton
📍 Barcelona