Torbjørn Kvale enhanced the BIBSYSDEV/nva-publication-api by implementing support for HiddenFile types in publication updates, addressing a gap where these files were previously not processed or saved. He updated the UpdatePublicationHandler to recognize and handle HiddenFile alongside other file types, improving the reliability and extensibility of the publication update workflow. Working primarily with Java and applying backend and API development skills, Torbjørn focused on stabilizing file-type handling and ensuring consistent processing across the update pipeline. His work, though scoped to a single bug fix, demonstrated careful attention to workflow robustness and traceability through integration with issue tracking systems.