Coming back to the original question, maybe he was asked questions from his field of interest, ie automata theory, static analysis and he aced those. Maybe he had a good PhD thesis/research paper. (Just compare his profile with that of Peddoju. NIyogi went to IIT KGP, Peddoju went to Osmania. Niyogi taught in BITS Pilani for 6 years. Peddoju taught in various nondescript colleges.). DT can hardly explain the basic concepts of databases/data mining, the sole area she claims to have authority over. So, if they can get recruited.
