During March 2025, contributed targeted reliability improvements to the open-webui and langchain repositories, focusing on backend development with Python. Addressed a typing issue in open-webui by correcting the type hint for a message variable, reducing the risk of runtime errors and improving code maintainability. In langchain, enhanced image processing robustness by ensuring the Pillow library is properly imported and handling exceptions gracefully, which improved compatibility with various image formats, including NumPy arrays. Demonstrated strong skills in exception handling and cross-format data handling, delivering two bug fixes that strengthened the stability and resilience of core components without introducing new features.