Worked on the AppCivico/smae repository to standardize input validation across data transfer objects by introducing reusable constants for character limits. Replaced hardcoded values with centralized constants such as MAX_LENGTH_DEFAULT and MAX_LENGTH_MEDIO, establishing a single source of truth for validation logic. This backend development effort, implemented in TypeScript using NestJS, improved maintainability and reduced the risk of inconsistencies or validation drift across DTOs. The approach focused on refactoring existing code to enhance future scalability and simplify updates. No bugs were fixed during this period, with the primary contribution being the delivery of a maintainable feature for DTO validation consistency.