30-day System Design Foundation
Foundations, core building blocks, and beginner problems. If you have one interview coming up in a month, run this.
Day 1
Requirements → Scale → Bottleneck → Solution
The thesis of the platform. Read this once — it becomes your compass.
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Day 3
Back-of-the-envelope: from DAU to peak RPS
Practice this until you can do it in your sleep.
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