We are looking for a Flutter developer to build a cross-platform AI chatbot application that runs on Android, iOS, and Web from a single codebase. The app will connect to a Dify.ai RAG backend powered by Groq as the LLM provider, allowing users to chat with uploaded documents and receive fast, accurate, context-aware answers. The backend (Dify + Groq) is already configured and exposes a REST API. The developer's responsibility is building the Flutter frontend that integrates cleanly with it. Minimum viable features for first launch: Chat interface with streaming response support Conversation history within a session Subject / category selector (e.g. filter by topic or document set) Simple onboarding screen (name + class/grade) API integration with Dify's chat endpoint Clean, mobile-first UI with light/dark mode Build output for Android APK, iOS, and Web