Two Rounds.
The first round was just an introduction to understanding my experience and what kind of products I had worked on.
There was also one more question about which is my favourite Developer-centric tool.
2nd Round
2nd Round was a case study round. This was about a feature in Browserstack only, where the goal was to increase the adoption.
This was a huge case study, which took a lot of effort.
When the time came to present the study, it got over in barely 30 minutes and I was not asked even a single clarifying question.
Next day, I was told that I had not qualified after this round.
Even after making this much effort, they did not give proper feedback.
I had also asked some questions to them about judging the culture, but did not get a satisfactory response for the same.
Overall, my suggestion would be avoiding giving the interviews for this company, even for practise.