The interview was quite smooth, and the people were polite.

I had one round of coding interview before this. If you solve one out of two questions, that's enough in the coding round.

Practice LeetCode well.

Round 1:

1. Level order traversal of a binary tree.
2. Questions from LeetCode.

Round 2:

1. Design Instagram (High-Level Design).

Round 3:

1. Design a scalable in-memory datastore (Low-Level Design). You will provide an SDK to the end-user with only put and get operations. You must address scaling, in-memory considerations, and discuss trade-offs.