Worked on the HKUDS/Vibe-Trading repository to enhance stock code handling by introducing backward-compatible support for both baostock-native and tushare-style formats. Focused on improving the reliability of data ingestion, the developer strengthened validation logic and normalized stock codes early in the processing pipeline to reduce edge-case errors. The implementation included comprehensive unit testing to ensure robust cross-format compatibility and maintain data integrity across providers. Leveraging Python for back end development and automated testing, the work addressed compatibility challenges in financial data workflows, resulting in a more resilient system for fetching and processing stock codes from multiple data sources.