Alex Xu's System Design Interview: An Insider's Guide is widely considered one of the best resources for cracking technical interviews at top-tier tech companies. While a direct PDF is not officially hosted for free by the author, many GitHub repositories and community pages host summaries, study notes, and references to the book's contents. Best GitHub Resources & Repositories
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alex-xu-notes and compare your summary with the community’s.(often misspelled as Alex Wu), focus on his established framework and the curated GitHub repositories that host the book's diagrams and reference materials. 1. Official and Top GitHub Repositories