Worked on the nextcloud/deck repository to enhance the reliability and maintainability of the card reordering functionality. Focused on backend development using PHP, the work addressed a bug in the CardService.reorder method by ensuring all arguments are parsed as integers, preventing type errors during card stack operations. The approach included explicit type casting in the controller and the addition of type hints to reinforce correct usage and improve code safety. These changes strengthened data integrity and reduced runtime errors, resulting in a more stable user experience when reordering cards, while also improving the auditability and future maintainability of the codebase.