> Markdown version of [/jobs/ext/1370377-senior-android-software-engineer-barcelona](https://www.wearedevelopers.com/jobs/ext/1370377-senior-android-software-engineer-barcelona). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Android Software Engineer - Barcelona - **Company:** Proton Ag - **Location:** Barcelona, Spain - **Salary:** €60,000.0 - €110,000.0 - **Contract:** Permanent contract - **Skills:** Android Software Development, Memory Management, Sync (Unix), Virtual Private Networks (VPN), Password Management, Multithreading, Caching, Kotlin, Jetpack Compose - **Published:** July 22, 2026 - **Apply:** https://es.indeed.com/viewjob?jk=92994694e8c37f2e ## About the Role * 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 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 mobile scalability considerations, including caching, network usage, responsiveness, and offline behaviour * You are comfortable navigating ambiguity and contributing to product and technical discussions * Experience with privacy, security, encryption, sync systems, or offline-first architectures is a strong plus * Rust experience is a plus, but not required, as we continue moving towards a platform-independent Rust logical core that communicates with our Android applications through generic interfaces ## Description 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. ## Related Videos - [Build Delightful Mobile Experiences with Kotlin, Realm, and Atlas Device Sync](https://www.wearedevelopers.com/videos/694-build-delightful-mobile-experiences-with-kotlin-realm-and-atlas-device-sync) - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [HTTP headers that make your website go faster](https://www.wearedevelopers.com/videos/1676-http-headers-that-make-your-website-go-faster) - [The Dark Corners of Kotlin Multiplatform](https://www.wearedevelopers.com/videos/100143-the-dark-corners-of-kotlin-multiplatform) - [Why Kotlin is the better Java and how you can start using it](https://www.wearedevelopers.com/videos/661-why-kotlin-is-the-better-java-and-how-you-can-start-using-it) - [Moving from Java to Kotlin](https://www.wearedevelopers.com/videos/384-moving-from-java-to-kotlin) ## Related Articles - [Cross Platform Mobile Development Frameworks to Use in 2025](https://www.wearedevelopers.com/magazine/404-cross-platform-mobile-development-frameworks-to-use-in-2025) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Basic And Advanced Networking in Dart and Flutter](https://www.wearedevelopers.com/magazine/112-basic-and-advanced-networking-in-dart-and-flutter) - [The Biggest German Tech Companies](https://www.wearedevelopers.com/magazine/424-the-biggest-german-tech-companies)