During April 2025, Alban Farchi focused on enhancing the reliability of stacking operations in the pydata/xarray repository. He addressed a bug in the Dataset.to_stacked_array method, ensuring that dimension stacking order consistently follows the order of appearance, even after transpose operations. Alban implemented a regression test to verify the corrected behavior and prevent future issues, thereby improving the stability of downstream data analysis workflows. His work involved Python programming and leveraged skills in data analysis, library development, and testing. The targeted fix reduced shape-related errors in analytical pipelines, reflecting a thoughtful and precise approach to open-source library maintenance.