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. We are profitable, independent (no VC control), and selectively hire from the top ~1% of applicants. If you want to do meaningful work with exceptionally high-caliber people, this is it.
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. 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, untangling the cycle that shouldn’t have been there. Improve the day-to-day: build times, local dev setup, test ergonomics, debuggability, developer experience




5+ years building and operating backend systems in production, including code you stayed responsible for long after launch, with a focus on modern PHP
~ Working knowledge of Rust, or clear evidence you can get there quickly — we care that you understand ownership and lifetimes
~ Experience evolving shared code that other teams depend on, and doing it without breaking them
~ Technology: you’ll get the right hardware and the right software you need to do your best work.

We offer
strong health coverage, solid retirement options, generous leave, and wellness support so you can bring your best self to work every day
Transport: getting to the office shouldn’t cost you. Versátil Working: you own your schedule. If you need any extra support or reasonable adjustments during the hiring process, please let your talent partner know.
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📌 (Senior) PHP Backend Engineer (Barcelona)
🏢 Proton
📍 Barcelona