Interview with hiring manager 13 days later - hey, we would like you to move forward to the panel interview. That was done a week later. 21 days later - sorry, it was super competitive and you didn't make the cut.

4 stages - screening, writing task, interview with your future team manager, and the CS Leadership. CS Leadership interview was the last stage. The writing task was interesting - good way to check your communication skills in writing. Put effort into that one if you get to that stage.