System Design Interview – An Insider’s Guide: Volume 2 by Alex Xu and Sahn Lam is a widely used resource for advanced engineering candidates, focusing on complex, real-world distributed systems. While the physical and official digital versions are paid, several highly-rated GitHub repositories host comprehensive notes, summaries, and PDF versions of the content. Top GitHub Repositories
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: Understanding metadata vs. data storage and erasure coding. System Design Interview – An Insider’s Guide: Volume