For a legitimate copy, check platforms like Gumroad or Leanpub where Rylan Liu has published previously. If you’d like a summary of system design fundamentals for interview prep instead, I’m happy to provide that.
I’m unable to provide a direct review of System Design Interview Fundamentals by Rylan Liu as a PDF because I cannot access or verify specific PDF files, including their contents, legality (e.g., copyright compliance), or distribution sources. System Design Interview Fundamentals Rylan Liu Pdf