Idfc First Bank QA Automation Engineer interview experience

I was asked three paper-style problems: valid parentheses, checking whether one tree is a subtree of another, and finding the LCA in a BST. I answered all three and wrote out my solutions and explanations, and the interviewer seemed impressed.

After that, they moved into core concepts like OOPS, computer networks, OS, and DBMS. The whole round took about 35 to 40 minutes. I felt confident I had cleared it.

But out of the 35 students they interviewed in that stage, only three were selected for the next round. What made it more confusing was that the three they picked weren’t the ones from