Based in our Paris office, you’ll join one of several high-impact product teams focused on Inbox (Proton Mail and Calendar), Proton Account, Lumo, and Meet, helping build the foundational experiences that power Proton’s ecosystem and the next generation of privacy-first products. From authentication, identity, and account security to privacy-preserving AI experiences and secure online collaboration tools, 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.