Summary The National Library of Medicine seeks a Senior Metadata Librarian to develop, implement, and optimize metadata standards supporting biomedical, scientific, and digital collections. This role advances discovery, access, interoperability, and data quality across NLM resources. The successful candidate will provide leadership, collaborate with technical and subject matter experts, and promote metadata best practices. Experience with standards such as BIBFRAME, RDF, Dublin Core, and MARC desired. Responsibilities Serve as a technical authority in a specialization, either a broad functional area such as cataloging criteria or preservation of rare materials, or in a narrower but very complex subject area related to biomedical research. Develop policies, programs, services and/or products for a library system. Develop authoritative new approaches and methods to resolve highly unusual information problems. Perform highly specialized and/or authoritative cataloging. Serve as an expert ...