MMT MakeMyTrip : Tech Lead

I began my interview process with an online HackerRank test, which I found to be relatively easy.

The first round was a 1-hour coding assessment. I encountered two questions. The first was an easy implementation problem involving two arrays representing a store's open and close timings. The second was a dynamic programming question that I recognized but hadn't prepared thoroughly. I managed to develop a recursive approach and explained how memoization could optimize it, which the interviewer seemed satisfied with.

The second round, also 1 hour, was focused on system design. My task was to design a railway system, specifically detailing the database schema, SQL queries for routes and booking tickets, and how to handle concurrent bookings. This felt like a medium-difficulty challenge.

The third and final round was an on-site interview, which lasted 2 hours. Although HR initially indicated it would be for Low-Level Design and basic questions, it turned out to be a full-fledged High-Level Design discussion centered on Microservices. This round was quite challenging. We delved into topics such as reducing high latency between two microservices, designing an idempotent ticket booking system, and creating a scalable system to handle very high QPS. Additionally, there was a coding question: I needed to download a website's HTML, count occurrences of a specific string (e.g., 'makemytrip' on https://www.makemytrip.com/), and output the result in a specified format [URL, string, count]. The key requirement was to implement this using multiple threads and ensure proper communication between them.

Overall, all my interviews were conducted by very good and polite interviewers. I was selected for the role.