Atlassian Senior Java Software Engineer interview questions

First a 20 mins introduction call with recruiter, then code pairing round. Although it is a code pairing round but if we ask more questions they consider it as they are guiding us and consider it as negative point, so I will not call it a code pairing round but just Coding round. They have some sluggish bluejeans setup for interview which didn't work during the interview day, we had to switch to Google hangouts which wasted more than 20 mins of the interview. They send you a link with zip file of java project and a pdf with 3 questions. It was a rather simple N level hierarchy type question, you need atleast 10 mins to work out the solution but they were expecting that I should have completed it in less than 5 mins. I was working out the solution on paper first before typing but in feed back he said after 5 mins of starting he didn't implement anything.