First they emailed some screening questions. They are standard Java questions, as an experienced Java developer I have no problems with it. After sending my answers back they arranged a phone interview a few days later. Again they asked mostly Java questions, topics including array, List, Map, equals()/hashcode(), some design patterns. Solid Java programmers should have no problems with these questions, but there're a few of them that are a bit harder, you'll need to be more hardcore person to answer all of them correctly. I didn't get two of the hard ones in the phone interview right, but they still progress me to next round. It's a coding test with a programmer. He showed me a piece of confusing code, and a junit test case. The test was failing, and I have to find the bug in the code so the test will pass. It's actually not that hard, but I was quite nervous so it took me quite a while to find the bug and fix it. The guy basically sit next to you and watch you coding, like a pair programming. You can talk to him about your thoughts. This is actually a very tough test for those who's not comfortable with pair programming or being watched. I can be more efficient when working alone. They ask you about your favorite IDE before the coding test, you can choose either IntelliJ or Eclipse, or notepad if you like. I didn't think I do well in the coding test but they still progress me tho next round. (I have to go, I'll finish this later)

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.