Worked on the apache/iceberg-python repository to enhance code quality by addressing type annotation issues related to PyArrow schema handling. Focused on correcting type annotations for pa.Schema in the schema_to_pyarrow function and associated methods, this effort improved type safety and clarity throughout the codebase. Leveraging Python and data engineering skills, the work aligned typing practices across the module, enabling more robust static analysis and reducing the likelihood of typing-related bugs. The changes maintained API stability, ensuring no behavioral impact for downstream consumers, and laid the groundwork for future improvements in typing discipline and contributor onboarding within the project.