Insider Full Stack Engineer interview questions

There are 2/3 rounds of interviews. Interviews were conducted by the Paytm team Round 1: This round started with questions on technologies I was going to work with. Later interviewer asked me around 3-4 questions on Algorithms and Data Structures. Round 2: This round was conducted by the CTO of Insider. This round was based on system design concepts. He asked me to draw any system of the project I worked on and then asked me to add features to the existing system. Later I received the call from HR stating that I have been shortlisted.