Worked on the pagopa/interop-be-monorepo repository, focusing on backend reliability and data integrity. Addressed a critical validation issue by restoring logic to ensure that dailyCallsPerConsumer remains strictly less than dailyCallsTotal during service descriptor creation and updates. This fix closed a validation gap that previously allowed inconsistent descriptors, reducing the risk of downstream errors and aligning the workflow with established governance rules. Utilized TypeScript for backend development and testing, emphasizing robust API validation. The work improved long-term maintainability and code quality in the catalog-process, demonstrating careful attention to detail and a methodical approach to enforcing business logic through code.