The system design interview
What interviewers look for in a system design round, a step-by-step framework for the 45 minutes, back-of-the-envelope estimation, the building blocks to know, a worked outline for a URL shortener, and common mistakes.
CodexBash, , 5 min read
For roles beyond entry level, coding rounds are joined by a system design round: "design a URL shortener", "design a chat app", "design a news feed". There is no single right answer, which is exactly what makes it unnerving. Interviewers are not checking that you produce their design; they are watching how you reason about requirements, scale and trade-offs. This article gives you a framework for the hour and the building blocks to fill it with.
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