About Proton

Join Proton and build a better internet where privacy is the default

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.

The Role

Based in our Barcelona office, you’ll join one of several high-impact product teams across Proton Pass, Payments, and Proton VPN, helping build privacy-first products used by millions around the world. From secure password management and identity protection to encrypted financial tools and internet freedom products that help users bypass censorship and surveillance, you’ll work on technically ambitious products with real-world impact. As a senior engineer, you’ll collaborate closely with product, design,



and engineers across Proton to build and ship high-quality Android experiences using Kotlin, Jetpack Compose, and an increasingly shared Rust core, helping define what “great” looks like for privacy-focused consumer products at scale.

What we are looking for
- You have strong experience with Jetpack Compose and modern Android development practices
- You care deeply about product quality, usability, and delivering exceptional user experiences
- You have experience taking end-to-end ownership of features, from scoping and technical design through to delivery and iteration
- You have strong experience building maintainable, scalable, and testable mobile architectures
- You are comfortable working across large codebases and collaborating across multiple teams
- You have experience mentoring engineers and raising the technical bar within a team
- You have a strong understanding of performance, concurrency, multithreading, and mobile memory management
- You understand mobil

📌 Senior Android Software Engineer (Barcelona)
🏢 Proton
📍 Barcelona