After formal introductions the interview started with some CS fundamental questions from networking, OS like threads vs process, tcp vs udp etc

After that I was asked two DSA questions of LC medium level from trees and dp.
On the next day recruiter reached out telling the round was cleared and wanted availaiblity for on-sites 

Two question were asked one however I do not remember them. Both were of Medium difficulty. 
Round went very well

In this round also there were 2 questions of medium difficulty however had a bad experience since the interviewer couldnt explain the question well and didnt answer my clarifying questions satisfactorily and i ran out of time while implementing the second question.

I was asked to design a Key Value Store where an interface was given to me which could append something to a file, get bytes from an offset from a file and create a file. Initially was asked to design a single machine kv store but later we discussed about making it distributed and sharded. Round went well.

In this one was asked to design a Delayed Scheduler.
So expectation was to given the logic and also give code for it, similar to what we do in DSA interviews. This is a standard Linkedin Concurrency round question however followups were hard.

Had a discussion around the past projects of past companies. For one of the projects was made to deep dive. Also some behavioural questions were asked