Recently I have been interviewed at AirtelXLabs for BackEnd Engineer

R1 : DS/ Algo based
-- Mirror of Binary Tree
-- Find the minCost to traverse all the edges.
Questions on ACID properties, Multithreading, Java OOPS etc

Round 1 Went well. The Iterviewer is also nice got a good feedback and they scheduled my round 2 at same day.

R2 : [Horrible Experience]
Interviewer was 10 min Late.
-- String Matching Question. (He wasn't try to understand my solution, was asking wierd questions like how can I assume that in Java int array initialises with 0 by default.)
--Alot of questions regarding Multithreading and Microservices.
(I told him that i have never workd on Multithreading just know very few about it. But he was like we solely work on Multithreading and want to judge on that basis)
Asked a HLD question regarding Kafka

	(In between the interview he went to receive some of his calls and sometimes went somewhere. So, it was wasting my time because in System Design I want to clear some doubts. But after telling me question he went somewhere)

One more thing I want to ask what if Interviewer started speaking in his native language should I also need to start in that language or continue in English? (In whole interview he was speaking Hindi)