Worked on the vtex/faststore repository to enhance testing infrastructure by centralizing and standardizing Jest configuration across multiple packages. This involved refactoring existing setups to consolidate base Jest settings, which reduced duplication and improved maintainability. Separate configurations for unit and integration tests were introduced within the api package, enabling more targeted test execution and faster feedback during development. The changes streamlined test organization and execution, making it easier for new contributors to onboard and for teams to maintain consistent testing practices. The work was implemented using JavaScript and TypeScript, with a focus on configuration management, refactoring, and automated testing workflows.