Quick response. Not sure what kind of people they look for though. After initial intro we started working on coding questions. Asked the minStack question, i quickly told them the answer and mentioned that i knew this already so if they want they could give me a different question or i could code the same question. The interviewer was prepared though and they had another question. Kudos to them for this. Then they asked me a rate limiter question. I had to design a rate limiter to limit the number of calls to an api function. I coded this up and we ran the code and tested a few cases and everything looked good. Then I asked a few questions about the product. I dug a little deeper and started asking about if they do any learning or smart reporting based on error/attack patterns as it is a network visualization product. After this we wrapped up the call and a day later i got an email that they will not move forward and that i was a good culture fit, but they were looking for stronger technical skills. I might be wrong about this but I felt like I my technical skills were okay but I was not a good culture fit for that team but your guess is as good as mine.