Round 1 - Algorithm round Provided an API key to fetch the data(json) from a url. This data contains the list of partners and their countries and on which dates they are available. One needs to find out the days when most partners are able to attend the event. Round 2 - Coding Round Merge k sorted lists Round 3 - Design Netflix The interviewer was not knowledgeable and had problem speaking and understanding English. It was very difficult to understand what all aspects he wanted to focus in the interview. It seemed as if he was waiting to hear the contents written in his evaluation sheet. I expected the round to be interactive, but there was a huge communication gap between us. To be very honest, never expected this from a company like Hubspot. Result - Reject