This was the first screen for a senior full stack position at Discord. The coding exercise was to build a chat server that can support multiple chat clients. There is a prompt provided to you with the MVP clearly defined. They allow the candidate to use google, stack overflow, API docs, etc to come up with your solution. The screen was ~75 min long and the interviewer was nice and helpful and very collaborative. My only negative feedback is that it seemed that the interviewer expected me as the candidate to go above and beyond the MVP, since he did ask me to implement follow up scenarios and cases after I implemented the defined MVP. I thought these were just extra things since we had completed the MVP, however I was rejected a day later, leading me to think that the interviewer's expectation was to successfully implement all the follow ups. I think it would be helpful if this was actually explicitly stated in the prompt, therefore setting objective expectations for the candidate. I would also consider what type of screen is appropriate for the position the candidate is applying for. As a full stack engineer, unless you have previous experience in building a chat server/protocol, you probably don't use socket programming, connections/disconnections, event emitters on a frequent basis. The exercise/project should be tailored to the specific position.