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.
You have extensive experience building and shipping high‑quality Android applications using Kotlin.
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 a strong understanding of performance, concurrency,



multithreading, and mobile memory management.
You understand mobile scalability considerations, including caching, network usage, responsiveness, and offline behaviour.
Rust experience is a plus, but not required, as we continue moving toward a platform‑independent Rust logical core that communicates with our Android applications through generic interfaces.
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. Candidate Privacy Notice When you apply for a position, refer a candidate or are considered for a role at Proton Technologies AG (Proton, we, us or our), your information is stored in Greenhouse, in accordance

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