Interview Session : Design a chat system

A Mock interview of a System design interview at feta

Interviewer: Can you walk us through your approach for designing a chat system for Feta?

Candidate: Absolutely. To start, I'll ask a few questions to clarify the requirements and constraints for this system.

Interviewer: Okay, sure. Let's say that we need to support billions of users sending billions of messages every day. The chat needs to be fast and re…