CaaStle Senior Software Engineer interview questions

There were 3 rounds. 1. They asked java basics, spring boot , one low level design question and one DS question . 2. DS questions ( first missing character) , some puzzles ( from top puzzles on google) and java and spring related questions. Interviewer was pretty nice in both rounds. 3. Project Round : Interviewer wants to discuss tech stacks which she knows ( was not aware of docker/aws , hence told to skip these things) And Rejected with no reason. Would have been much better if interviewer might have more experience.