Atlassian Back-end Software Engineer interview questions

Don't interview here. Atalssian don't care about you. This is one of the worst interview experience ever. Recruiter contacted me via LinkedIn and asked for telephonic interview. After I passed telephone interview, within an hour I got an email that they want me to come on site. I provided the availability for on site and went for that. On site has 4 rounds and all went really well. I was hoping to get offer, but never heard back from them. After 4 months (YES YOU READ IT CORRECT.. AFTER 4 MONTHS) all of sudden I got a message from another recruiter that they want to move forward with an offer as I have already passed the interview 4 months ago and want to have one last round with another manager from their Sydney office. To make comfortable their time, I gave interview on Sunday evening. That manager did not ask any technical questions but just my previous work experience. It went so well that I was expecting that I would get offer. But to my surprise I got a rejection email that they don't want to move forward with me. I was really frustrated and annoyed that why would you waste my time after 4 months if you already deciding not to move forward with me.