Sep 14, 2026 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. Check our open-source projects here
We aim to provide the best user experience to millions of people around the world willing to take back their online privacy, while providing sophisticated technologies to bypass network restrictions in highly censored countries.
Work closely with a group of Back-End Engineers and Architects to build resilient, massively-scalable solutions for millions of people to rely on




Collaborate with teams of client application developers and product management to ensure that the back-end meets critical business and reliability requirements
Document back-end capabilities and their proper use so that all Proton VPN clients can implement correctly-functioning solutions
Experience with PHP-based entry-points to a back-end software stack
Solid understanding of SQL (MySql preferred) and data modelling
Solid understanding of Redis or other caching technologies
Solid understanding of including both developing and consuming Web-based APIs
Experience with Docker or similar containerization technologies
Experience with metrics graphing/analysis toolkits such as Grafana and OpenTelemetry
Experience with Python and/or Rust
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

📌 Engineer Software (Barcelona)
🏢 Proton
📍 Barcelona