Received an email from recruiter after I applied on their website to schedule a quick phone call. During the call many questions about my experience, why I applied for slack, and similar other questions. After that I scheduled a 45 mins call with an engineer that asked me few data structure questions, and few other android related questions. Very generic screening questions that I always pass, I answered all questions, but I don't think then interviewer liked it when I asked "Please feel free to tell me the correct answer", as I think he stuttered to add more info, and when I asked a follow up question he said lets move on. Overall, I really wanted to work for Slack, but now I am not sure its a forgiving environment that I would like to work for.