Worked on the LerianStudio/midaz repository to enhance metadata validation reliability, focusing on improving data integrity and maintainability within backend systems. Addressed a key bug by refactoring the validation logic, consolidating redundant checks into a streamlined approach that reduced code duplication and validation overhead. Introduced comprehensive end-to-end integration tests to ensure robust transaction metadata validation across core application flows. This effort increased test coverage and reliability, directly addressing issue #1454. The work was implemented using Go, with an emphasis on backend development and testing practices, resulting in a more maintainable codebase and improved reliability for transaction metadata processing.