First round was 30 minute call with HR, they asked in details about your experiences listed on your resume & past projects. Second round was 1.5 hr interview with 2 software engineers. I was given code and was told to spend 30 mins optimizing it. The optimization involved hashmaps. Afterwards, we had to discuss the optimizations made and why it worked. There is a superday after this 2nd round but I did not make it.