Atlassian Software Engineer - Java Developer interview questions

The interview process consists of altogether five rounds. First is an online HackerRank test of five questions in 90 minutes. Four of the questions are average and one is more difficult. No need to solve all of them, important is to maximise points. Second is a 30 minutes non-technical Hangouts interview with an HR person. The talk is about motivations, previous work, familiarity with Atlassian etc. Third round is an hour long pair programming exercise where one needs to find some bugs and implement features for a user/group service. There are five tasks which is probably too much for the amount of time but the important is to be able to collaborate and take hints, and to write the correct tests to be able to find the bugs. The fourth round would be a technical interview and the fifth would be an interview with a chosen team.