Worked on the Aceleradora25/e-acelera-back repository to address a critical staging environment issue by refining CORS configuration management. Focused on backend development using TypeScript, the work involved reverting a previous ALLOWED_ORIGINS change and updating it to point to the correct staging URL, effectively resolving cross-origin request failures during staging deployments. This targeted bug fix improved environment parity and reduced deployment risks between staging and production. The change was implemented as a single, well-documented commit, ensuring clear traceability for future configuration audits. The approach demonstrated careful attention to configuration management and backend stability, prioritizing maintainability and deployment reliability over new feature delivery.