The interview process consisted of four rounds:

• Two rounds before lunch, and two rounds after lunch, held at the onsite cafe.

The first interview focused on your background, people and communication skills, roles you've filled, and past products delivered, before beginning the technical interview(s).

This was followed by whiteboard coding with two senior engineers, then a one-on-one session. They were evaluating your problem-solving process as much as the correct answer.

Given a string S and a string T, find the minimum window in S which will contain all the characters in T in O(n) complexity.