Series
This guide is to help you with system design interviews, structuring the interviews and utilize your 60 minutes into different segments and activities.
The interviewer says "Design Twitter" and slides a marker across the table. Your hand twitches toward the whiteboard, ready to draw a load balancer and three boxes labelled "service." Stop. The first
The problem lands - "Design a URL shortener" - and you know exactly what a system design interview wants from you. You've done the prep. You know there's a framework, you know roughly what the answer
Every system design interview opens the same way: a vague prompt, and a few minutes to turn it into a scoped problem by asking questions. Those questions fall into exactly two buckets, and knowing the
HLD and LLD are not two names for the same interview - they are two different rounds testing two different skills, and prepping for the wrong one is how people walk in confident and walk out confused.
You cannot follow a "design Twitter" walkthrough if half the words in it are unfamiliar, and you cannot defend a design if you only know the words and not the mechanics behind them. This post explains
If Part 1 was the architecture vocabulary, this is the code vocabulary - and unlike architecture, low-level design is graded on whether you can actually write it. A machine-coding round gives you 60 t
