The first round is coding. They conducted it on Interviewbit. Make sure your concepts are very clear and you practice data structures and dynamic programming problems thoroughly. Also you need to be thorough with everything mentioned in your resume since they ask every topic in depth

BuyHatke conducted campus recuirtment for SDE role in our campus,NIT Jamshedpur. The interview process consisted of four phase.First round was the CV shortlisting. 71 students are selected for online round.The Second round was a online contest on InterviewBit on Data Structure and Algorithm.Test duration is one and half hour and consisted four questions.Students who solved atleast two questions are shortlisted for the next round. Rest Rounds are taken on Skype.Third round was taken by one of the employee of BuyHatke. He asked three questions based on DS and Algo, some questions on project and some basic questions on OS. Fourth round was taken by the CEO of Buyhatke. He asked one algorithms questions,one System design question,Some details about project. They give enough time to think of the approach.Overall it was a very good experience.