I've been a software engineer in the defense industry my entire career. No contract I've ever been a part of included a UI/UX designer, I rather doubt the customer would have been willing to pay for one.
Interfaces are always designed by the programmers alone, and they are universally awful.
Heck, several years ago I remember having to learn Blender so I could create 3D models for some simulation software (no one else to do it, guess it's me again -> here have some rockets that look like something out of 1950s scifi). Apparently the folks writing the contract didn't think we'd need anyone with any 3D art skills to create 3D visualization software.