PL-TEKST-App is a cross-platform mobile application developed with React Native and the Expo SDK, enabling a single JavaScript codebase to run natively on both Android and iOS. The frontend communicates with a RESTful backend built in Python using the FastAPI framework, containerized and deployed on Railway cloud platform, with automatic CI/CD triggered by GitHub pushes. API responses are handled asynchronously using the Fetch API, while device-level clipboard integration is implemented via the expo-clipboard native module. The project follows modern development practices including Git version control, Semantic Versioning, Conventional Commits, and MIT open source licensing.