During December 2025, Jeroko worked on the apache/iceberg-python repository, focusing on improving data ingestion reliability by relaxing the Table Field ID compatibility constraint. He replaced a blanket prohibition on adding files with a compatibility-based check, allowing ingestion of files with compatible field IDs while preventing inconsistent schema updates. This approach reduced operational errors during schema evolution and enhanced cross-version interoperability. Jeroko implemented targeted tests to ensure robust handling of compatibility scenarios and documented the changes for users. His work leveraged Python and data engineering skills, emphasizing API development and testing to improve data integrity and developer experience within the project.