Tjean contributed to the apache/burr and apache/hamilton repositories by focusing on integration, documentation, and usability improvements. For apache/burr, Tjean enhanced the Haystack integration by refactoring input handling logic and adding warm_up support, which streamlined configuration and improved reliability for production search pipelines. The work involved Python and JSON, emphasizing code cleanup, refactoring, and clear documentation to reduce ambiguity and support maintainability. In apache/hamilton, Tjean improved the onboarding experience by updating the example notebook with Colab and GitHub badges and explicit dependency instructions, ensuring reproducibility and smoother setup for new users across different environments.