Integral Ad Science Machine Learning Operations Engineer interview questions

Attended interview with different stages, first round was leeedcode hard problem(I know the solution because it was asked in google interview and was asked same). next round was with technical team of 3 members which was focused on different machine learning and behavioural questions. then last was with Manager which was eventually good, But after attending all the interview rounds i was rejected for invalid reason or maybe it was racism and they dont want to hire outsider.