In my role I'm leading UI Standardization efforts at the Wikimedia Foundation. Providing a consistent and accessible user interface across projects is fundamental for enabling people to be creative and productive. See our Design Style Guide for our process and our guiding principles.
Disclaimer: I work for or provide services to the Wikimedia Foundation, and this is the account I try to use for edits or statements I make in that role. However, the Foundation does not vet all my activity, so edits, statements, or other contributions made by this account may not reflect the views of the Foundation.