Christophe Haen developed two backend features over two months, focusing on robust API and package management solutions. For the fastapi/fastapi repository, he enhanced Python 3.10 compatibility by enabling stringified annotation evaluation in FastAPI route signatures, improving typing reliability and reducing runtime errors for applications using string-literal annotations. He implemented dedicated validation tests in Python and YAML to ensure correctness and maintainability. In conda-forge/staged-recipes, Christophe delivered Signurlarity, a lightweight presigned URLs library compatible with boto3, handling dependency and package management to streamline downstream adoption. His work demonstrated depth in backend development, dependency management, and automated testing practices.