R1:

I was asked a DSA question. Similar to below:

https://leetcode.com/problems/task-scheduler/description/

Was able to solve it. Interviewer was very helping and was moved to next round.

R2:
Interviewer joined 5 min late. Started asking about projects I have done (He didn't even go through resume). Asked which db we use in our projects and why. I explained why we used PostgreSQL (for ACID compliance). Then asked what twitter might have used, I mentioned NoSql for scalability and performance. When asked about handling increased data loads, I suggested sharding as a solution. He asked on what param we should shard I mentioned time_stamps.Querying by user? Suggested composite indexing or hashing. Asked If I have used Message broker and I mentioned I have used ASB.

20 min interview, thats it. Just said thankyou and left the call and rejected. Unfortunately, some interviews are unpredictable, and despite preparation, the experience can feel unproductive due to unclear evaluation criteria.

PS: I received an invite on email for checking my availability just two days before interview. Also, I believe my profile was taken from Naukri, if that helps someone.