Worked on enhancing API reliability and data integrity in the PrestaShop/PrestaShop repository by addressing null safety for Manufacturer and Supplier endpoints. Focused on backend development using PHP, the work involved updating the return types in ManufacturerController and SupplierController to allow null values when records are absent. This technical approach reduced the risk of null-related runtime errors and improved the robustness of storefront and partner integrations. By refining how the API handles missing data, the changes contributed to more predictable and stable interactions for clients consuming these endpoints, reflecting a careful attention to backend reliability and type safety in PHP applications.