Dan enhanced IIIF image format handling in the inveniosoftware/invenio-app-rdm repository, focusing on improving metadata extraction reliability and maintainability. He implemented a configuration-driven approach in Python, updating the system to dynamically derive supported image formats for metadata extraction from IIIF_FORMATS, rather than relying on manual updates. By removing PDF from the IIIF_FORMATS_PIL_MAP and centralizing format recognition, Dan reduced the risk of unsupported formats and simplified future maintenance. His work leveraged backend development and configuration management skills, resulting in a more robust and adaptable metadata extraction process that will accommodate new IIIF formats with minimal manual intervention.