"Round-1
Rate yourself in elastic search, java, redis cache, db ,aws
Describe your project architecture in detail
Describe elastic search - shard , cluster configuration , scale
RPM and scaling of your application
Deployment of application
Redis configurations - 5 top commands in CLI
How do you debug redis.
Composite index in sql and their ordering.How does that affect performance of reads.
Deployment details
Scaling details
ELK architecture
"
"Round -2
Project architecture
Design MakeMytrip
Cache architecture
Scalability issues and resolution in current project"

Round-3
HLD and LLD AVP engineering took this round 1. Map services , Design an api to get currentlocation of vehicle , set boundry and alarming system.
This was very in depth.

Takeaway :

1. if you are interviewing for Paytm principal, prepare system design in a strong way, all your interviews will be around it.