I applied through a recruiter. The process took three weeks.

There were three rounds in total:

• Round 1: A 1.5-hour discussion with a principal engineer about architecture and system design related to Android stuff.
• Round 2: A 1-hour discussion about DS, which involved finding the next largest number by rearranging the digits, and algorithms, which involved assigning a requested vehicle number or a random vehicle based on availability in O(n) time if the requested one was not present or already assigned.
• Round 3: A 1-hour discussion with a manager related to past work experience.

Next largest number by rearranging the digits.