Android Developer

September 29, 2026

Remote

Senior

Warszawa

Worth knowing

English is required
B1 level

Description

Rakuten Viber is one of the most popular and downloaded messaging apps in the world, giving engineers the chance to influence hundreds of millions of users. The company is looking for an experienced Android developer to design and develop the Viber Android client. The role covers enhancement and maintenance of existing features as well as delivery of new, high-quality functionality.

Responsibilities

Participate in the development of the Viber client for Android, contributing to the enhancement and maintenance of existing features
Collaborate with a diverse team of developers to efficiently produce new features, complete proposed initiatives, and contribute to overall application improvements
Quickly grasp clients' requirements, technology needs, and solution architecture to deliver high-quality solutions
Work closely with product managers, the design team, and others to develop appropriate solutions that align with user experience and design guidelines

Requirements

5+ years of commercial experience in Android application development
Strong proficiency in Java, Kotlin, and/or Android development
Solid understanding of Collections, Concurrency/Multithreading in Java, Coroutines/Flow, and experience with Android Jetpack components (WorkManager, Paging, ViewBinding, LiveData)
Proficient in Dagger 2, multi-module projects, and Gradle for building and maintaining Android applications
Thorough understanding of mobile application design principles and UX
Experience with databases, including SQL, optimization and Room
Proficiency in writing unit tests and version control using Git
Familiarity with design patterns (GoF), architecture, and refactoring of applications
Experience in MVP/MVI/MVVM architecture-based development
Intermediate spoken level of English for effective communication within the team
Experience leveraging AI tools to enhance productivity or decision-making is a strong advantage

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