During June 2025, Juan Cambrac focused on improving the checkout process in the Max-Eee/E-commerce-recommender repository by addressing a critical issue in the billing address form. He identified and fixed a missing onChange handler for the billing city input, which previously led to data loss and potential order failures. By implementing this fix using React and TypeScript, Juan ensured that user input for the city field is now reliably captured and processed during checkout. His work enhanced data integrity and user experience, demonstrating attention to detail in front end development and a methodical approach to resolving bugs in production code.