User Experience Librarian is more about outside of the library walls

The position (with many variants, including: emerging technology librarian' embedded librarian; Electronic Access and User Experience Librarian, Public Services-User Experience Librarian III / Instructor in the Library; Assessment and User Experience Librarian, USER EXPERIENCE REFERENCE LIBRARIAN AND WEBMASTER; Digital User Experience Librarian);  is more about analytics (metrics) and user experiences, than librarianship in any traditional sense of the term.

Examples of the job descriptions are here:

• Knowledge and understanding of best practices, current issues and trends in assessment and usability [job ad at University of Manitoba Libraries]
• Knowledge of metadata coding standards. Experience with library catalogue end users and/or end users of electronic resources... Website design and maintenance experience. [job ad at Nova Scotia Provincial Library]
• basic knowledge ofMARC; experience with one or more Library enterprise systems suchas library management systems (Symphony, Aleph, Endeavor),discovery interfaces (Ebsco Discovery Services, Summon, Primo),search technologies (Solr, Elasticsearch), course managementsoftware (Sakai, Canvas, BlackBoard) [job ad for Discovery User Experience Librarian at Indiana University ]
• will coordinate usability assessment fo