React Native Developer

🏢 Summary: Long-term B2B contract for an experienced React Native Developer to integrate React Native into an existing native mobile platform in the banking sector. The role focuses on hybrid mobile architecture, combining React Native with iOS and Android applications, and evolving a scalable mobile solution. Hybrid work model with regular onsite presence in Warsaw. 🗂️ Requirements: Strong experience with React Native, Experience in native mobile development (iOS or Android), Proven experience integrating React Native into existing native applications, Experience designing hybrid mobile architectures, Experience with Angular 📃 Skills: React, ReactNative, iOS, Android, Angular, JavaScript, TypeScript 🏢 Description: Industry: banking Rate: up to 160 pln/h net + VAT, B2B Location: Warsaw - hybrid (2 days in the office per week) Long-term cooperation Introduction & Summary We are seeking experienced React Native Developers to assist with a brownfield project focused on integrating React Native into our existing native mobile platform. Main Responsibilities Design and implement solutions that combine React Native with existing native (iOS/Android) applications. Define and drive architectural decisions for hybrid mobile development. Collaborate with teams to ensure smooth integration and optimal performance. Support the evolution of the current mobile platform using a scalable approach. Key Requirements Strong experience with React Native. Solid background in native mobile development (iOS and/or Android). Proven experience in integrating React Native into existing native applications. Strong architectural and problem-solving skills. Experience with Angular. English - minimum B2. Nice to Have Experience with brownfield projects.

🏢 Summary: Long-term B2B contract for an experienced React Native Developer to integrate React Native into an existing native mobile platform within the banking sector. The role focuses on hybrid mobile architecture, combining React Native with iOS and Android applications in a brownfield environment. Work in a hybrid model with involvement in architectural decisions and platform evolution. 🗂️ Requirements: Strong experience with React Native, Experience in native mobile development (iOS or Android), Proven integration of React Native into existing native applications, Ability to design hybrid mobile architecture, Experience with Angular 📃 Skills: ReactNative, iOS, Android, Angular, React 🏢 Description: Industry: banking Rate: up to 160 pln/h net + VAT, B2B Location: Warsaw - hybrid (2 days in the office per week) Long-term cooperation Introduction & Summary We are seeking experienced React Native Developers to assist with a brownfield project focused on integrating React Native into our existing native mobile platform. Main Responsibilities Design and implement solutions that combine React Native with existing native (iOS/Android) applications. Define and drive architectural decisions for hybrid mobile development. Collaborate with teams to ensure smooth integration and optimal performance. Support the evolution of the current mobile platform using a scalable approach. Key Requirements Strong experience with React Native. Solid background in native mobile development (iOS and/or Android). Proven experience in integrating React Native into existing native applications. Strong architectural and problem-solving skills. Experience with Angular. English - minimum B2. Nice to Have Experience with brownfield projects.

🏢 Summary: Long-term B2B contract for a Senior Android Developer to design and implement Android applications in a fintech onboarding domain. The role combines Kotlin/Jetpack Compose mobile development with Java-based microservices and REST integration in a hybrid work model. The position involves architectural guidance and close collaboration with cross-functional teams. 🗂️ Requirements: 5+ years of Android development experience, Proficiency in Kotlin, Experience with Jetpack Compose, Strong knowledge of Android SDK, Hands-on experience with Architecture Components, Experience with OkHttp or similar networking tools, Strong understanding of Java, Experience with Spring framework, Experience with microservices integration, Working knowledge of SQL, Experience with unit testing 📃 Skills: Kotlin, Java, Android, Jetpack, Compose, SDK, Spring, Microservices, REST, SQL, OkHttp, MVVM, Koin, Fintech 🏢 Description: 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.

🏢 Summary: Long-term B2B contract for an Android Developer in a fintech project focused on customer onboarding and maintaining mobile app functionality across multiple markets. The role involves building Android applications with Kotlin and Jetpack Compose and contributing to Java-based backend microservices and integrations. The position combines mobile development with backend collaboration in a hybrid work model. 🗂️ Requirements: 5+ years of Android development experience, Proficiency in Kotlin, Experience with Jetpack Compose, Strong knowledge of Android SDK, Hands-on experience with Architecture Components, Experience with OkHttp or similar networking tools, Strong understanding of Java, Experience with Spring framework, Experience with microservices integration, Working knowledge of SQL, Experience with unit testing 📃 Skills: Android, Kotlin, JetpackCompose, AndroidSDK, ArchitectureComponents, OkHttp, Java, Spring, Microservices, SQL, UnitTesting 🏢 Description: 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.

🏢 Summary: Senior Android Mobile Developer role focused on building and enhancing Android test tools and backend components within a Token ID ecosystem for secure payment solutions. The position involves developing high-impact mobile applications and ensuring scalable, high-performance integrations with backend services. Work is delivered in a hybrid model as part of a long-term B2B contract. 🗂️ Requirements: 7+ years of professional experience, Strong Android development experience, Proficiency in Java 21, Experience with Spring Boot, Experience with REST APIs and Web Services, Knowledge of SQL, Experience with Kubernetes, Experience with Docker, Experience with Jenkins, Proficiency with IntelliJ, Experience with Claude, Experience with GenAI 📃 Skills: Android, Java, Spring, REST, SQL, Kubernetes, Docker, Jenkins, IntelliJ, Claude, GenAI 🏢 Description: We are looking for an experienced Senior Android Mobile Developer to join a project for a world-leading payment technology company . You will work on advanced Android tools within a Token ID ecosystem, contributing to high-impact mobile applications used globally. 🔧 Project Overview The project focuses on Token ID Android Tools development , including multiple mobile applications supporting secure payment solutions. 📍 Location & Work Model Location: Warsaw or Gdansk Work Mode: Hybrid (1-2 days hybrid from the office) ⏳ Contract Details Contract Type: B2B (details to be shared) Daily Rate: 1.100 PLN/day – 1.300 PLN/day 👤 Experience Minimum 7+ years of professional experience 🛠 Mandatory Skills Please ensure your CV clearly reflects hands-on experience with the following: Android Development Java 21 Spring Boot REST APIs & Web Services SQL Kubernetes (k8s) Docker Jenkins IntelliJ Claude Code GenAI 📱 Responsibilities Develop and maintain new features for Android test tools and their backend components Design, develop, and enhance Android-based tool applications within the Token ID ecosystem Work on the following engagement components: Issuer Mobile Application TR Mobile Application Terminal Mobile Application Demo Wallet Ensure high-quality, scalable, and well-performing code Optimize performance and ensure seamless backend integration Collaborate with cross-functional teams across the full SDLC Debug, troubleshoot, and continuously improve applications 🚀 Join us and be part of a cutting-edge project for a global payment technology leader, where your work will directly impact secure, large-scale mobile solutions used worldwide.If you’re ready to take on a challenging Android role and work with modern technologies - we’d love to hear from you!

🏢 Summary: The role involves building and scaling a high-performance React Native mobile application integrated with an existing web customer portal. The developer will own the mobile architecture, ensuring scalable navigation, state management, networking, and seamless backend API integration for iOS and Android. The position includes end-to-end feature delivery, performance optimization, and establishing mobile development best practices. 🗂️ Requirements: 5–8+ years of Frontend or Mobile development experience, 3+ years of production experience with React Native on iOS and Android, Strong proficiency in JavaScript, Strong proficiency in TypeScript, Experience with native module integration, Experience with deep-level debugging, Knowledge of mobile performance profiling, Ability to build accessible and responsive mobile UIs, Experience with unit, integration, and e2e testing, Experience with CI/CD workflows, Experience with React Navigation, Experience with state management using React Query, SWR, Redux, or Context 📃 Skills: ReactNative, JavaScript, TypeScript, iOS, Android, ReactNavigation, ReactQuery, SWR, Redux, Context, Jest, RTL, CI/CD, APIs 🏢 Description: The objective is to build and scale a React Native mobile application that serves as a high-performance companion to an existing web customer portal. You will own the core mobile experience, architecting scalable solutions for navigation, state management, and networking while ensuring seamless integration with existing backend APIs. This role is ideal for a developer who can deliver end-to-end features and establish mobile best practices within a collaborative team environment. Details Location: Remote, with a preference for candidates based in Wrocław (for quarterly on-site client meetings). Primary Project Language: Polish. Target Platforms: iOS and Android. Responsibilities End-to-End Development: Building mobile features that maintain parity and cohesion with the web customer portal. Architecture: Designing scalable code structures, focusing on efficient navigation, state management, and robust networking. Performance & Reliability: Ensuring high stability, fast UI responsiveness, and implementing offline-tolerant UX where necessary. Technical Leadership: Establishing mobile development standards, mentoring other engineers, and improving release cadence. Collaboration: Working closely with product, design, and backend teams to ensure a unified user experience. Requirements General Seniority: 5–8+ years in Frontend or Mobile development. React Native Mastery: 3+ years of experience shipping and maintaining production React Native apps (iOS + Android). Core Skills: Strong proficiency in JavaScript/TypeScript . Native Modules: Experience with native module integration and deep-level debugging. Optimization: Solid knowledge of mobile performance profiling and building accessible, responsive UIs. Testing & DevOps: Comfort with unit/integration/e2e testing (Jest, RTL) and CI/CD workflows. Navigation: React Navigation. Data & State: React Query / SWR or Redux / Context. Nice to Have Familiarity with both Expo and bare React Native workflows. Experience with push notifications, deep linking, and mobile analytics. Prior experience with B2B, customer self-service, or account management applications.

🏢 Summary: Long-term remote B2B contract for a Senior React Native Developer to build and scale a greenfield mobile application for iOS and Android from scratch. The role focuses on delivering a high-traffic, content-driven app with personalisation, real-time engagement features, and scalable architecture. Strong ownership and direct collaboration with international product teams are expected. 🗂️ Requirements: 5+ years commercial experience with React Native, Experience building production mobile apps from scratch, Experience with iOS and Android platforms, Experience with REST API integrations, Experience with CMS or DAM integrations, Experience implementing push notifications, Experience implementing deep linking, Experience with analytics and event tracking, Experience with performance optimisation, Experience with A/B testing or personalisation platforms, Experience with App Store and Google Play release processes, Experience with unit or component testing, English level C1+, Availability before Q3 start, Ability to work on B2B contract 📃 Skills: React, ReactNative, JavaScript, TypeScript, iOS, Android, REST, CMS, DAM, Firebase, Amplitude, Analytics, A/B, Testing, Push, DeepLinking, Node.js, Next.js, Mapbox, GoogleMaps 🏢 Description: Senior React Native Developer (iOS & Android) We are looking for an experienced Senior Mobile Developer (React Native) to join a long-term international project for a premium luxury retail brand. You will work on a completely new mobile product built from scratch for both iOS and Android, serving 250k+ daily users from launch. The project focuses on creating a modern, content-driven mobile experience with personalised feeds, exclusive offers, and real-time customer engagement features. This is a greenfield project with no legacy code and strong ownership opportunities from day one. Project Details 100% Remote Full-time (40h/week) B2B contract Rate: 100 - 125 PLN/h net Long-term cooperation (9 months + possible extension) Start: ASAP / Q3 Required overlap: 14:00–18:00 CET Occasional travel: max once per quarter English: C1+ required Responsibilities Building and maintaining a React Native mobile application for iOS and Android Designing scalable mobile architecture from scratch Integrating CMS, APIs, personalisation and experimentation platforms Implementing push notifications, deep linking and campaign flows Optimising app performance for high-traffic environments Collaborating directly with an international client and product teams Ensuring code quality through testing and best engineering practices Must-Have Requirements 5+ years of commercial React Native experience Strong experience with both iOS and Android applications Experience delivering production mobile apps from scratch Hands-on experience with: REST API integrations CMS / DAM integrations Push notifications Deep linking Analytics & event tracking Performance optimisation A/B testing or personalisation platforms Experience with App Store & Google Play release processes Good testing practices (unit/component testing) English level C1+ (spoken and written) Nice to Have Firebase / Amplitude Feature flagging & experimentation platforms Headless CMS in retail or e-commerce Streaming APIs AI-assisted features GDPR / consent management tooling Google Maps / Mapbox E2E testing Node.js / React / Next.js Polish language skills Important Please apply only if: you are available before the Q3 project start, you have commercial React Native experience for both iOS and Android, you can work on a B2B basis (Polish entity preferred). Recruitment Process CV review & pre-screening Technical interview Client interview (in English) Offer If you’re interested, send: your CV in English, your availability, expected hourly rate (B2B, net PLN), short information about your experience with React Native and CMS/personalisation integrations.

🏢 Summary: Development and maintenance of an Android mobile banking application in the payments and transfers domain for a large-scale banking project. The role focuses on implementing new features, integrating with backend services, and ensuring high code quality using modern architectural patterns. The project has significant impact on end-user mobile banking experience. 🗂️ Requirements: Minimum 3 years of commercial Android development experience, Practical experience with Kotlin, Very good knowledge of Android SDK and Android Studio, Experience with Coroutines and Flow, Experience with Architecture Components, Experience with Dagger2, Experience with Jetpack Compose, Knowledge of Clean Architecture, MVVM or MVI, Experience with REST API and WebSocket integration, Experience with Git, Experience with CI/CD tools, Ability to write unit, integration and UI tests, Experience working in Agile methodology, Fluent Polish, Communicative English, Residence in Poland 📃 Skills: Kotlin, Android, AndroidSDK, AndroidStudio, Coroutines, Flow, ArchitectureComponents, Dagger2, JetpackCompose, CleanArchitecture, MVVM, MVI, REST, WebSocket, Git, CI/CD, TeamCity, Jenkins, Gradle, UnitTesting, IntegrationTesting, UITesting 🏢 Description: Dołącz do projektu realizowanego dla jednego z największych banków w Polsce, w którym rozwijamy i utrzymujemy obszar płatności oraz przelewów w aplikacji mobilnej. Zespół odpowiada za wdrażanie nowych typów przelewów, dostosowanie aplikacji do regulacji europejskich oraz redesign wybranych elementów systemu. To projekt o dużej skali i realnym wpływie na codzienne doświadczenia użytkowników korzystających z bankowości mobilnej. Twoje zadania Rozwój i utrzymanie aplikacji mobilnej Android w obszarze płatności i przelewów Implementacja nowych funkcjonalności oraz optymalizacja istniejących rozwiązań Integracja aplikacji z backendem poprzez REST API i WebSocket Dbanie o jakość kodu, testy jednostkowe, integracyjne i UI Udział w projektowaniu architektury aplikacji (Clean Architecture, MVVM/MVI) Współpraca z zespołami backend, UX i analitykami w metodyce Agile Udział w code review oraz procesach CI/CD Wymagania Minimum 3 lata komercyjnego doświadczenia w tworzeniu aplikacji Android, w tym praktyczna praca w Kotlin Bardzo dobra znajomość Kotlin, Android SDK oraz Android Studio, w tym doświadczenie z Coroutines & Flow, Architecture Components, Dagger2 oraz Jetpack Compose Znajomość wzorców projektowych (Clean Architecture, MVVM, MVI) oraz doświadczenie w integracji z backendem (REST API, WebSocket) Wcześniejsza praca z Git oraz narzędziami CI/CD (TeamCity, Jenkins, Gradle) oraz umiejętność pisania testów (jednostkowych, integracyjnych, UI) Doświadczenie w pracy w metodyce Agile Gotowość do pracy hybrydowej – wizyty w biurze 1 raz na 2 tygodnie Komunikatywna znajomość języka angielskiego Wymagane przebywanie na terenie Polski oraz płynna znajomość języka polskiego Mile widziane Doświadczenie w technologii .NET / C# Benefity, które czekają na Ciebie: Tytuł Great Place to Work od 2015 roku - to dzięki opiniom pracowników otrzymujemy tytuł i wdrażamy nowe pomysły Stabilność zatrudnienia - 2,1 MLD PLN przychodu, brak długów, od 2006 roku na rynku Dzielimy się zyskiem z pracownikami - od 2022 roku przeznaczyliśmy na ten cel już ponad 76 milionów PLN Bogaty pakiet benefitów - prywatna opieka zdrowotna, platforma kafeteryjna, zniżki na samochody i więcej Komfortowe miejsce pracy - pracuj w naszych biurach klasy A lub zdalnie Dziesiątki fascynujących projektów dla prestiżowych marek z całego świata 1 000 000 PLN rocznie na Twoje pomysły - taką kwotą wspieramy pasje i akcje wolontariackie naszych pracowników Stawiamy na Twój rozwój - meetupy, webinary, platforma szkoleniowa i blog technologiczny – Ty wybierasz Fantastyczna atmosfera stworzona przez wszystkich Sii Power People Dołącz do zespołu Sii – rozwijaj umiejętności, zdobywaj doświadczenie i buduj karierę!

🏢 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 🚀

🏢 Summary: Short-term contract for an experienced Mobile Developer to build and maintain cross-platform mobile applications using Flutter for Android and iOS. The role focuses on delivering high-performance, responsive apps with strong architecture and best practices. The project runs until the end of June in an international environment. 🗂️ Requirements: Commercial experience as Mobile Developer (regular or senior level), Strong hands-on experience with Flutter, Experience with Android development, Experience with iOS development, Knowledge of mobile application architecture, Experience in building, testing and releasing mobile apps, Ability to work independently, English proficiency minimum B2 📃 Skills: Flutter, Android, iOS, Dart, Mobile, Git, CI/CD 🏢 Description: Salary: 800 - 1000 PLN/MD + VAT (B2B) Remote: elastic hybrid from Gdynia Why choose this offer? Opportunity to work with an international client from the safety/technology sector The international work environment will give you the opportunity to interact with the English language on a daily basis The Jit community will bring you a nice time during regular integration meetings Project We are looking for a Mobile Developer (Flutter + Android / iOS) who will join to our client operating in the safety and risk management industry for a short-term project running until the end of June. You will be responsible for developing and maintaining mobile applications across both platforms, ensuring high performance, responsiveness, and a seamless user experience. Expected competences and knowledge Proven commercial experience as a Mobile Developer (regular to senior level) Strong hands-on experience with Flutter and Android / iOS development Solid understanding of mobile application architecture and best practices Experience in building, testing, and releasing mobile applications Ability to work independently and take ownership of tasks Strong problem-solving skills Good communication skills in English - min. B2 level Technologies you'll work with Flutter Android / iOS About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.