Gustavo worked on the openai-node repository, focusing on upgrading the schema validation layer by migrating all Zod imports from version 3 to version 4. This change was implemented in a single, cohesive commit that updated imports and schema handling throughout the TypeScript codebase, ensuring compatibility with the latest Zod API. By preserving existing validation semantics, Gustavo minimized risk while reducing technical debt and preparing the repository for future features that depend on enhanced validation. His work demonstrated a strong grasp of API development and schema validation, delivering a targeted solution that maintained data integrity and supported ongoing maintainability within the project.