The overall interview experience was positive. All the rounds went excellently, but I received a rejection email. They stated they have hired someone else. I'm not sure what sort of developers Postman is expecting.

There were a total of 5 rounds of interviews:

1. General tech discussion on OS, network, and databases.
2. Coding round - needed to create APIs with optimal logic.
3. Design round - no design creation was necessary, but a scenario was given and solutions needed to be proposed.
4. Problem-solving - no data structures/algorithms, but general problem-solving, such as the traffic congestion problem and the elevator problem.
5. Hiring Manager round - discussion on aspirations and other topics.

1. Difference between HTTP and HTTPS, cryptography, CAP theorem.

2. Design and code TinyURL.