Applied through a reference and got a call pretty quickly. The first round was a programming interview to find a missing element in a contiguous array using binary search. This went fine and was called for a second round. The first question during the second round was to write a program to solve Sudoku. This was surprising and seemed like a question from Google interviews. I had an hour to write and solved most of it using iterative programming but I guess the interviewer was expecting a recursive solution. Made it to the second person anyways. The second interviewer came in with a laptop and asked me to execute a bunch of small and trivial programs and was asking very detailed questions about computer architecture and OS like why arguments are pushed only from right to left on a function call and why program always gets loaded at a specific address instead of 0. These questions were a bit tricky and I think I fumbled a little bit in answering these. At the end of the interview they let me know the decision right there that they wanted to pass. I was happy that the decision was immediate and no prolonged waits.