Everything is fine. The interviewers were quite polite.
For future interviews, I hope you will consider formalizing the task. Providing a couple of paragraphs describing your expectations, rather than just a few empty classes, would be beneficial.
Here's the text to clean up:
The following metrics were computed from 28 interview experiences for the Atlassian Senior Software Engineer role in United States.
Atlassian's interview process for their Senior Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very negative feelings for Atlassian's Senior Software Engineer interview process in United States.