Worked on the xupefei/delta repository to enhance the reliability of checkpoint metadata loading in Spark-based workflows. The main contribution involved refactoring the loadMetadataFromFile function by extracting its core parsing logic into a new private method, unsafeLoadMetadataFromFile, and removing an unused method to streamline the codebase. This approach improved the separation of concerns between parsing and exception handling, making the code more maintainable and easier to test. The work focused on backend development and refactoring, utilizing Scala to implement these changes. The update reduced code surface area and confusion, directly supporting maintainability and reliability in checkpoint processing tasks.