Worked on enhancing the Amsterdam spatial data schema by delivering a Terrain Schema Enhancement in the Amsterdam/amsterdam-schema repository. Focused on improving the validation, accuracy, and consistency of terrain-related attributes, the work involved updating database schema design and data modeling practices using SQL. Strengthened data quality controls for terrain fields, which supports more reliable GIS analytics and downstream data products. Updated validation rules and tests to ensure the maintainability and efficiency of future schema changes. Demonstrated a disciplined approach to version control and schema evolution, resulting in a focused, high-impact feature that improves the structure and reliability of spatial data.