Worked on the pydata/xarray repository to enhance data export flexibility by implementing customizable chunk key encoding for the to_zarr API, supporting Zarr V2 compatibility. The approach involved adding a new parameter to to_zarr, updating documentation, and introducing targeted tests to ensure robust functionality. This feature enables users to control chunk key formatting, improving interoperability with Zarr backends and supporting reproducible, scalable data exports for large datasets. The work demonstrated backend development skills with Python, leveraging the xarray and Zarr APIs, and emphasized thorough documentation and testing practices to ensure the new capability integrates smoothly into existing data storage workflows.