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System Design Interview – An Insider's Guide: Volume 2 by Alex Xu and Sahn Lam is a sequel to the first volume that dives into 13 complex real-world system design problems. While Volume 1 covers fundamental building blocks like rate limiters and news feeds, Volume 2 focuses on more intricate, large-scale systems such as payment gateways and digital maps. Have you found a legitimate open-source alternative to