The application process included a "case challenge" in which I was asked to design the final UI of new features for their existing product with their existing design language. They also suggested I send them my file before my presentation. I felt that my results could easily be used by them if they liked pieces of my design. Of course they said they'd already implemented these features, but how would I know they won't pick any idea from my designs anyway? (The product isn't publicly available for free.) I didn't like the prospect of presenting changes to a design that I made with very little background knowledge of their domain or design system to the original designer. Somehow I felt I could only lose in this situation. Finally, the challenge gave me the impression they are looking for a pure UI designer that works through stacks of tickets fast. There was only space for the UI changes they asked for, not for any research, exploration or testing that I would go through as a product designer.