In April 2026, Mike Yin developed real-time question generation features for the HKUDS/DeepTutor repository, focusing on backend reliability and configuration accuracy. He implemented WebSocket-based support for live question requests, ensuring that configuration changes were immediately reflected by introducing runtime cache invalidation for LLM and embedding clients. Using Python and FastAPI, Mike emphasized robust API development and comprehensive unit testing, adding targeted tests to validate both WebSocket behavior and cache management. His work addressed the challenge of stale settings in live systems, resulting in faster, more reliable question generation and improved runtime stability, demonstrating thoughtful engineering depth within a short timeframe.