April 9, 2026

Senior React Native Developer

Senior • Hybrid

120 - 170 PLN

Katowice, Poland

Development of a cross-platform mobile application (iOS + Android) in React Native for end-users, integrating with the company's IoT devices.

Our expectations

  • Minimum 4 years of experience in React Native and 5+ years in general frontend development (JavaScript/TypeScript, HTML, CSS).

  • Strong proficiency in React Native, including best practices for cross-platform mobile application development (iOS + Android).

  • Experience in integrating mobile applications with IoT devices, including:

  • Reading device parameters (temperature, operating modes, energy consumption, historical data).

  • Controlling devices via the app (schedules, power on/off, operating mode settings).

  • Data synchronization with cloud backends and handling push notifications.

  • Ability to work with backends, microservices, and IoT platforms, including the implementation of business logic and network communication.

  • Experience with multi-brand and multi-language applications, scalable across different markets.

  • Knowledge of mobile and integration testing, test automation, and CI/CD (e.g., Bitrise, GitHub Actions, Fastlane).

  • Familiarity with mobile application monitoring and debugging tools.

  • Ability to ensure application and communication security (user authentication, data encryption, securing communication channels between the app, device, and cloud).

  • Application performance optimization: startup time, bundle size, responsiveness, offline mode support, and connectivity issue handling.

  • English min. B2 level

  • Ready to work from the office in Katowice 1x/week (the team meets on Wednesday)

Welcome Skills

  • Proficiency in TypeScript, Redux / MobX, React Navigation, and GraphQL.

  • Experience working with applications requiring high scalability and integration with cloud platforms.

  • Knowledge of UX/UI principles specifically for mobile applications.

  • Experience in migrating existing applications to React Native or modernizing the technology stack.

  • Knowledge of security standards for mobile and IoT applications.