I applied online to the company website. After 2 weeks, I got a reply with an online test link on HackerRank.

The test was a little difficult. After clearing the test, I was called for interviews.

First Round (Problem-solving round):

• Some problems related to DFS and another problem on binary trees (hard question).

Second Round (Machine coding round):

It was a 2-hour machine coding round. We were given sample application requirements, and we had to design and code it out in 2 hours, focusing on Object-Oriented Design, extensibility, and error handling.

Third Round (Low-level design round):

Discussion on LLD of a sample problem and working through all the issues such as extensibility, performance, and efficiency. Mainly focused on DB schema and OOD.

Fourth Round (Hiring manager):

Pretty standard questions related to work experience.

In all the interviews except the hiring manager's, the interviewers were very kind and polite. However, in the HM round, the interviewer was not patient enough to listen to us fully.

Count Islands

Time to burn the binary tree