Android Developer – Kotlin & Jetpack Compose

We are looking for an Android developer who wants to develop and evolve the heyOBI app, connecting digital shopping with the in-store experience within a large retail ecosystem. You will contribute to intuitive and reliable mobile experiences covering product discovery, shopping, customer accounts, and loyalty benefits. You will collaborate closely with engineers, UX/UI designers, product owners, and architects to deliver maintainable solutions for international markets. Your key responsibilities include: Develop and maintain Android features using Kotlin and Jetpack Compose, integrating with existing Android Views where needed.Translate business requirements and UX/UI designs into accessible, responsive, and user-friendly mobile experiences.Integrate GraphQL and REST APIs for product information, store availability, customer accounts, shopping lists, and loyalty services.Implement reliable authentication, session management, and network error handling.Manage asynchronous operations and application state using Kotlin Coroutines and Flow.Develop and maintain local persistence, caching, and data synchronisation to ensure consistent behaviour under varying network conditions.Support seamless navigation across native screens, embedded web content, deep links, and push notifications.Ensure application quality through automated testing, code reviews, performance optimisation, and production issue analysis.Collaborate on localisation, market-specific requirements, CI/CD, and Google Play releases. Benefits Motivizer Benefits Platform to choose and manage all your benefits in one place. You receive a budget (550 PLN monthly). You can choose medical care package, meal tickets, sports cards (we have Multisport and on preferential terms, we have membership cards to one of the most popular Gyms), cinema tickets, shop vouchers, discounts and many more.Language Courses – you'll have access to a multi-language learning platform enabling you to practice your language skills and learn new ones!Regular and systematic further training opportunities - both internally and from external providers. We support your ongoing learning and development.Cooperation within an internal community is our everyday reality. We have networking events, coding challenges, and company parties for different occasions. Qualifications Completed university degree in Computer Science or a comparable technical field.3-5 years of professional Android development experience, with strong proficiency in Kotlin and experience maintaining and evolving a production application.Hands-on experience with Jetpack Compose, a solid understanding of the Android SDK and application lifecycle, and familiarity with existing Android Views and Fragments.Practical experience with Kotlin Coroutines and Flow, including asynchronous operations and reliable UI state management.Experience integrating GraphQL and REST APIs, ideally using Ktor, with a good understanding of authentication, session management, and network error handling.Experience with local persistence and caching, ideally using Room and DataStore, and maintaining consistency between local and backend data.A good understanding of modular application design, separation of concerns, and dependency injection.Familiarity with WebView integration, deep links, push notifications, and Android background processing.Experience with automated unit and UI testing, debugging, crash analysis, and performance optimisation.Familiarity with Git, Gradle, CI/CD, and Google Play release processes.Strong communication skills in English and Polish, with readiness to work in a hybrid model in Katowice. Nice to have: Experience in retail, e-commerce, or loyalty applications.Familiarity with Kotlin Multiplatform or Compose Multiplatform.Experience with Firebase, ML Kit, or CameraX.Knowledge of accessibility and localization for international apps. About OBI Smart Technologies WHO ARE WE: We are a joint venture between OBI and Reply Group, responsible for co-designing, building and operating mission-critical digital platforms for commerce, customer service, and omnichannel retail. OUR MISSION: "We unite technology leadership with deep retail vision to implement standardized processes and scalable digital products that drive efficient support for one of Europe’s largest DIY retailers. Leveraging proven best practices, we advance the internationalization of products and the digital mindset of our partners, delivering consistent and business-critical solutions to support the targets of our customer."