A user interface is like a joke. If you have to explain it, it's not that good."
https://www.bagaar.be/services/user-experience-and-user-interface
Here's the proof: https://userinyerface.com
When talking about UX engineers, think about an architect not a decorator.
User-centered!
Put yourself in the user position.
A user wants to achieve tasks, he doesn't want to use a dedicated data model.