Worked on modernizing the Feast integration within the zenml-io/zenml repository, focusing on refactoring the API to support direct use of FeatureService instances for more flexible feature retrieval. Enhanced the get_historical_features and get_online_features methods to accept both feature name lists and FeatureService objects, improving usability and compatibility. Updated dependencies to require Feast Python API version 0.12.0, ensuring alignment with new integration patterns. Additionally, addressed time handling by replacing deprecated datetime.utcnow() with timezone-aware datetime.now(timezone.utc) throughout the codebase. Leveraged Python, API integration, and refactoring skills to improve maintainability, testability, and reliability of time-related functionalities.