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The System Design
Primer

Learn how to design large-scale systems. Prep for the system design interview. An organized, interactive collection of resources to help you build systems at scale.

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Scalability Load Balancing Caching Database CDN Microservices REST CAP Theorem
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38 Chapters

Comprehensive coverage from core concepts to advanced system design patterns.

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Interview Ready

Practice real system design interview questions with detailed solutions.

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Personal Notes

Take notes per chapter with auto-save. Your study companion, built in.

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Dark & Light

Beautiful reading experience in both themes. Easy on your eyes, day or night.