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# Android Developer (Payments)

- **Company:** Proton Mail
- **Location:** Madrid, 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 8, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

The ideal candidate will bring 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

We value empowerment and flexibility and keep our structure flat to keep moving fast and avoid unnecessary politics.
Tired of blending into the crowd?
Join us and do work you can truly be proud of.
Check our open?source projects here!
The Payments Team The goal of the Payments team is to enable revenue generation for the entire Proton ecosystem.
This comes in the form of introducing new payment methods for users to architecting our client libraries.
This team has impact across all of Proton's products and is critical to the success of the business as a whole.
The Payments Team works to continuously expand the possibilities for users to pay with various payment methods, beyond just plain credit cards or Paypal - we aspire to create the best end to end payments experience for users globally The team works in tight collaboration with the Account Team (responsible for the Proton user lifecycle), the Proton Finance team, and every single Business Unit to ensure that plans, promotions and pricing meet user expectations -- we are the most cross?functional team the business with direct impact on the ecosystem strategy
Role overview As a fullstack cross-platform Android Engineer, you'll play a pivotal role in developing Proton Inbox using Jetpack Compose and Rust.
You'll use an end-to-end ownership approach, ensuring timely delivery of high-quality, scalable solutions that will delight our customers.
Key responsibilities 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