As librarians become developers, they become more involved in open source projects and standards creation. Historically, non-librarian/developers have taken the lead in this work, with librarians providing support. But now, librarian/developers are envisioning and developing projects themselves, with and without non-librarian/developers. X and Y will discuss their recent experiences with two national projects, the open source SimplyE app and the NISO FASTEN work, and provide suggestions for other multi-type groups that include librarians, librarian/developers, and non-librarian/developers that work together. Each group brings their own strengths and weaknesses, but the result can now much richer for the merging.