> Markdown version of [/jobs/ext/2724216-fullstack-cross-platform](https://www.wearedevelopers.com/jobs/ext/2724216-fullstack-cross-platform). 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).

---

# fullstack cross-platform

- **Company:** Proton Mail
- **Location:** Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Mobile Application Development, Software Design Patterns, Memory Management, Mobile Application Software, Multithreading, Concurrency, Kotlin, Information Technology, Jetpack Compose, Data Caching
- **Published:** September 5, 2026
- **Apply:** https://startup.jobs/senior-android-engineer-pass-proton-2-6305938

## About the Role

* Bachelor's degree in Computer Science, Engineering or related field (or equivalent work experience)
 * Excellent problem-solving skills and the ability to think outside the box to overcome challenges
 * Passion for continuous learning and driving change in the rapidly evolving field of mobile development
 * Excellent communication and interpersonal skills
 * Proven experience developing mobile applications for Android using Kotlin
 * Proficiency with Jetpack Compose for Android, and familiarity with Rust
 * Strong understanding of mobile app architecture, design patterns and best practices
 * Knowledge of memory management techniques and best practices
 * Experience with multithreading and concurrency in mobile applications
 * Good understanding of scalability considerations when it comes to engineering mobile applications
 * Previous experience working in a fast-paced, scale-up environment

## Description

As a fullstack cross-platform Senior Android Engineer, you'll play a pivotal role in developing Proton Pass using Jetpack Compose and Rust. You'll lead with an end-to-end ownership approach, ensuring timely delivery of high-quality, scalable solutions that will delight our customers. Your ambition and enthusiasm will drive innovation and excellence both in Proton Pass and SimpleLogin products., * Develop and maintain cross-platform mobile applications for Android using a blend of cross-platform (Rust) and native technologies (Kotlin)

 * Take end-to-end ownership of mobile application development projects: you'll be comfortable with scoping projects, walking back from deadlines and being able to discern the important from the superfluous
 * Foster a culture of innovation by exploring new technologies, methodologies and approaches to mobile development - we tackle complex engineering challenges with creativity and ingenuity
 * Optimise mobile applications for performance, usability and responsiveness across different devices and screen sizes
 * Master memory management, multithreading and concurrency mechanisms to enhance performance and responsiveness of mobile applications
 * Design for scalability, considering factors such as data caching, network bandwidth and server load
 * Prioritise customer satisfaction by maintaining a customer-centric mindset throughout the development process, continuously seeking feedback and iterating to improve the user experience


## Related Videos

- [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse)
- [An introduction to Operate SV](https://www.wearedevelopers.com/videos/151-an-introduction-to-operate-sv)
- [Concurrency with Go](https://www.wearedevelopers.com/videos/191-concurrency-with-go)
- [Introducing Kotlin Multiplatform in an existing project](https://www.wearedevelopers.com/videos/276-introducing-kotlin-multiplatform-in-an-existing-project)
- [The Dark Corners of Kotlin Multiplatform](https://www.wearedevelopers.com/videos/100143-the-dark-corners-of-kotlin-multiplatform)
- [Structured Concurrency in Practice: CoroutineScope vs StructuredTaskScope](https://www.wearedevelopers.com/videos/100349-structured-concurrency-in-practice-coroutinescope-vs-structuredtaskscope)

## 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)
- [Basic And Advanced Networking in Dart and Flutter](https://www.wearedevelopers.com/magazine/112-basic-and-advanced-networking-in-dart-and-flutter)
- [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)
- [Top in-demand programming languages to learn in 2021](https://www.wearedevelopers.com/magazine/30-top-in-demand-programming-languages-to-learn-in-2021)
- [How We Built a Worry-Free System That Runs for 10+ Years – And What We’d Do Again](https://www.wearedevelopers.com/magazine/751-how-we-built-a-worry-free-system-that-runs-for-10-years-and-what-we-d-do-again)
- [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)