Hadrien Lepouse enhanced the airbytehq/airbyte repository by developing new data ingestion capabilities for the HubSpot source connector. He introduced an account_details stream, defining its schema and validating its integration through comprehensive tests. Additionally, he upgraded the CRM search streams to leverage the v3 properties API, improving both data retrieval reliability and compatibility with HubSpot’s evolving endpoints. His work involved Python development, API integration, and data streaming, with a focus on robust mocking and unit testing to ensure end-to-end functionality. The depth of his contribution is reflected in the careful validation of new features and the seamless upgrade of existing data pipelines.