3 rounds of 1hr interview back-to-back, first comes with a leetcode (claimed to be a leetcode problem but never seen anything likely) problem of solving a detection mechanism in a 8 sensor setup which send out signal with timestamp and a param, the system might receive signal in a random timeline and if in a 6 sec interval of timestamp u got 3 sensors sending a param higher than pre-defined value then do a report . Second round BQ including two normal BQ question and a interesting one. Third round cache OOD.