May 21, 2026
Android Developer with Java Backend Experience
Senior • Hybrid
Warsaw, Poland
GENERAL INFORMATION:
Industry: fintech
Location: Warsaw (hybrid work model - 2x month in the office)
Rate: up to 165 PLN/h
Form of cooperation: B2B
Project duration: long-term
ROLE SUMMARY:
The Android Developer role is focused on facilitating customer onboarding while maintaining the fintech app functionality across diverse markets.
MAIN RESPONSIBILITIES:
The primary duty of the Android Developer is to design and implement robust Android applications while collaborating across teams.
Design and implementation of Android applications using Kotlin and Jetpack Compose.
Build and optimize Java backend microservices and REST endpoints.
Translate business requirements into technical solutions in collaboration with stakeholders.
Act as a technical reference point for team members and guide architectural decisions.
Encourage innovation and the adoption of new technologies for operational excellence.
Communicate complex technical concepts to non-technical stakeholders effectively.
Foster a culture of mentorship and shared learning within the team.
Communicate clearly in both Polish and English while adapting language for diverse audiences.
KEY REQUIREMENTS:
5+ years of experience in Android development.
Proficiency in Kotlin, Google Jetpack Compose, and Android SDK.
Hands-on experience with Architecture Components and networking tools such as OkHttp.
Strong understanding of Java, Spring and microservices integration.
Working knowledge of SQL and experience with unit testing.
NICE TO HAVE:
Experience in the Fintech industry.
Knowledge of Koin DI and MVVM architecture.
A proactive mindset and excellent communication skills.
OTHER DETAILS:
The position is based in Warsaw, within a team structure of 2 developers, 1 tester, a scrum master, a product owner, and business analysts. The work model is hybrid, requiring 2 office days per week, with flexible working hours.
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Warsaw, MZ, Poland
120 - 135 PLN
🏢 Summary: Development of a large-scale fintech mobile product in the deferred payments domain, focused on designing and implementing an Android application in Kotlin. The role involves building new features, integrating with internal and external APIs, ensuring high code quality, security, and performance. You will actively contribute to architectural decisions and the technological evolution of the product. 🗂️ Requirements: Minimum 6 years of Android development experience, At least 2 commercial Android projects delivered, Strong experience with Kotlin, Experience with REST API integration, Proficiency with Android Studio and Android SDK, Experience with Jetpack Compose, Knowledge of MVVM or MVI, Knowledge of Clean Architecture, Experience publishing apps to Google Play, Experience with CI/CD pipelines, Knowledge of mobile application security principles, Ability to ensure code quality and maintain documentation 📃 Skills: Kotlin, Android, REST, AndroidStudio, AndroidSDK, JetpackCompose, MVVM, MVI, CleanArchitecture, GooglePlay, CICD, GitLabCI, GitHubActions, Bitrise, Keystore, EncryptedSharedPreferences, ReverseEngineering, RootDetection 🏢 Description: Dołącz do zespołu naszego klienta – szybko rozwijającej się firmy fintechowej działającej w obszarze płatności odroczonych. Budują produkt, z którego codziennie korzystają tysiące użytkowników🤝 Twoje zadania: projektowanie i implementacja aplikacji mobilnej na Androida (Kotlin) 📱 współpraca z zespołem przy definiowaniu i tworzeniu nowych funkcjonalności 👥 integracja z wewnętrznymi i zewnętrznymi API ( m.in . weryfikacja tożsamości, operacje płatnicze) 🔌 realizacja oraz wsparcie testów kodu, wydajności i UX 🧪 diagnozowanie i usuwanie błędów oraz dbanie o jakość i dobre praktyki 🛠️ aktywny udział w rozwoju produktu technologicznie i funkcjonalnie 🚀 Szukamy osoby, która: ma min. 6 lat doświadczenia w Androidzie (preferowany Kotlin) + min. 2 komercyjne projekty 💼 pracowała z REST API 🌐 zna Android Studio, Android SDK oraz Jetpack Compose 🧩 zna architektury, wzorce i podejścia (MVVM/MVI, Clean Architecture) ⚙️ publikowała aplikacje w Google Play i zna CI/CD (GitLab CI, GitHub Actions, Bitrise) 🚛 rozumie zasady bezpieczeństwa aplikacji (Keystore, EncryptedSharedPreferences, reverse engineering, root detection) 🔐 dba o jakość kodu i dokumentację ✍️ zna angielski na poziomie min. B2 🇬🇧 Dlaczego warto? praca nad realnym produktem o dużej skali 📈 nowoczesny tech stack i kultura inżynierska 💻 wpływ na kierunek rozwoju produktu 💡 stabilny fintech z ambitną roadmapą 🚀