Worked on core enhancements and reliability improvements for the geotools/geotools and geoserver/geoserver repositories, focusing on geospatial data processing and map rendering. Addressed locale-specific test failures in GeoParquet by refining SQL data setup and geometry creation, and improved image rendering quality through subsampling and ROI alignment in Java. Upgraded the DuckDB JDBC driver to leverage upstream bug fixes and performance gains, ensuring stable analytics and streamlined dependency management. Updated WMS map rendering outputs in GeoServer to reflect corrected visuals, validating changes through robust unit testing. Emphasized code refactoring, performance optimization, and careful validation to deliver maintainable, production-ready solutions.