First round was about general threading concepts, Android indepth, problem solving. Second round was about system design, although he agreed that there was no right or wrong answer for System design, he was still expecting same answer on his mind. So, didn't clear.

3 rounds in total 1 -> 1.5hr of discussion with principle engineer about the Arch, system design related to android stuff. 2 -> 1hr of discussion about DS ( Next largest number by re-arranging the digits ) and algo ( Assign requested vehicle number, if not present or already assigned assign random vehicle based on availability, in O(n) time ) 3 -> 1hr of discussion with Manager related to past work exp stuff