I got an email from the hiring manager via jobvite and the phone screen was set up for the next week. It went pretty quick. I was applying for the data mining team although the engineer that called was not a part of the team and didn't know what they were working on when I asked toward the end of the interview. He asked me two questions after asking me to tell about myself. 1) How to find the index of a String in another string ?What is the complexity? A) Using find() method in python. Worst case :- O(ab) where a and b are length of the strings. 2) How to convert a ternary expression of the form a?b:c into a binary tree structure. The expression can be nested? Got stuck on this and couldn't answer it. The interviewer was helpful and dropped hints but binary trees isnt my strongest suite.