The recruiter asked me directly; the overall process took two months.

The first and second rounds focused on system design and coding. The third round was to talk with the manager to discuss behavior and your responsibilities.

However, the HR representative was very rude and arranged everything unpredictably.

For example, there was silence for a couple of weeks between the second and third rounds, leaving you unsure if you had passed. They also tended to arrange everything in the same week, sometimes even calling you on the same day to arrange a meeting while you were working.

System design, algorithm, and coding questions.