During March 2025, Alex Llopis focused on backend development for the PrestaShop/PrestaShop repository, addressing a critical bug in the cart handling logic. He implemented a targeted fix in PHP to ensure that cart-related hooks explicitly received the correct cart instance, preventing context injection errors that could lead to data mismatches during checkout. This solution involved modifying the Cart class to improve parameter handling, followed by thorough validation through pull request review and testing. Alex’s work enhanced checkout reliability and data integrity, demonstrating a strong grasp of backend engineering principles and careful attention to the stability of core e-commerce workflows.