During July 2025, Bharath Velamala focused on enhancing the reliability of the regression metrics API in the evidentlyai/evidently repository. He addressed a recurring issue by implementing robust input validation and explicit exception handling in Python, specifically targeting the MAE, MeanError, and MAPE metrics. By steering users away from the generic 'tests' argument and guiding them toward the correct 'mean_tests' and 'std_tests' options, he improved error messaging and reduced the likelihood of incorrect usage. This backend development work strengthened the API’s robustness, improved user guidance, and decreased potential support overhead, demonstrating careful attention to error handling and regression metrics.