Bloomberg Software Developer interview questions

The process was very smooth. In first round they asked one dsa problem ( Leetcode hard problem) and also asked intro and any one project. In project they also asked some cross question . the interviewer was helpful . He was giving the hint if i stuck at any point.

5 rounds and I got up to the last one and got a rather strict senior software developer. Asked me to code a binary tree search. I began explaining my logic and how I'd solve it but he then would build upon the simple algorithm until I hit a stop or couldn't answer to his standards. I should've prepared more