About two weeks after submitting my application, I received an invitation to take a HackerRank test, which appeared to be sent automatically. I only had three days to complete the task - it was the first time I encountered such a short deadline; in other places I was given at least a week.
Moreover, the task was proctored, requiring a camera, microphone, and screen sharing. Because I was traveling at the time, despite my attempts I was unable to set up an environment that would not trigger the automated monitoring, and I was not able to complete the task.