Hilal Aydin worked on the amsterdam-schema repository, focusing on implementing JSON Schema type normalization to enhance data consistency and support evolving formatting requirements. By converting identifiers from integers to strings and coordinates from strings to numbers, Hilal established a more robust and predictable data contract, which reduced downstream validation issues and improved schema interoperability. The work involved careful data modeling, schema design, and API development, with changes tracked through version control to ensure traceability. Although the project scope was limited to a single feature over one month, the technical depth addressed core data quality challenges and prepared the schema for future evolution.