“Now the Bereans were more noble-minded than the Thessalonians, for they received the message with great eagerness and examined the Scriptures every day to see if these teachings were true.” – Acts 17:11
Senior interviewers report that 50% of candidates draw the exact same diagram for a chat system:
: Focuses on fundamentals like scaling from zero to millions of users, back-of-the-envelope estimations, and core components like rate limiters and consistent hashing. system design interview alex wu pdf
Key mental models to internalize
If you acquire the genuine Alex Xu (or the misattributed "Wu") PDF, you will find a structured, no-fluff guide. Here is the typical table of contents that explains why it is so effective. Senior interviewers report that 50% of candidates draw