Yilin Zhang developed two features for Source Academy, focusing on both backend and frontend improvements. On the backend repository, Yilin enhanced the AI chatbot’s prompt logic using Elixir, clarifying Source language guidance and enabling recursive programming to support more complex student queries. On the frontend, Yilin implemented a draggable chat icon with minimize and maximize controls in React and TypeScript, refining the user interface for a smoother chat experience. These updates included CSS adjustments for overflow handling and icon alignment, resulting in a more stable and polished UI. The work demonstrated thoughtful integration of AI, UI/UX design, and frontend development.