Miguel worked on stabilizing the local CSV upload flow for the comet-ml/opik repository, focusing on improving the dataset creation experience during local development. He addressed a persistent reliability issue by exposing the HttpHeaders.LOCATION header through CORS configuration and updating the TypeScript frontend to parse the dataset ID from this header. This targeted backend and frontend fix, implemented using Java and TypeScript, ensured that dataset creation completed reliably without manual intervention. By validating the end-to-end upload path and reducing debugging time, Miguel’s work enhanced the local development workflow, demonstrating a thoughtful approach to API development and CORS configuration challenges.