Proton is building a privacy‑first internet experience and offers Proton Mail, Proton VPN, Proton Drive and more. We are seeking a senior Android engineer to own mobile development for Proton Pass and SimpleLogin, combining Kotlin and Rust. You will take end‑to‑end ownership of the mobile stack, drive performance, scalability and a strong user experience across devices. Join a general team with offices in several cities and a flexible hybrid work model.