Monolith AI Senior Software Engineer interview questions

I had a really good experience until I had a repository review. From the very beginning it was obvious that one of the employees has a negative attitude. I answered all the questions. Given that it lasted 20 minutes, I tried to keep my anwers short and concise. Especially that I was rushed and reminded of how short the interview is at the beginning. But I asked if my answers are exhaustive enough twice. And none of them said that I should elaborate. Then the next day I received a feedback that my answers lacked the depth. I felt that I didn't have a chance in the first place.