I applied online. The process took 3 weeks.

It was very low energy. The question itself isn't hard at all, and it's like an entry-level question that really doesn't require study or anything. However, the interviewers were just so low energy and uncaring that it led to me talking too much and doing more work than needed.

Just create a very simple method and then you expand on it, like others say, just basic MVVM. There's not much thought involved past that. They just copy-paste a prompt and then stay silent the whole way. Actually, when asking a followup, they just straight up told me the wrong answer, which I had to find out myself later, so it's probably better to veer on being more quiet, unfortunately.