Filter down millions of items to a few hundred using fast, lightweight methods (e.g., Matrix Factorization or Approximate Nearest Neighbors via Vector Databases).
Instead of looking for a stolen PDF, I suggest searching GitHub for or "Alex Xu summary." You will find repos where candidates have turned the book's 12 chapters into a checklist.
To pass an ML system design interview, you cannot just jump straight into picking a modeling algorithm. You need a repeatable framework. Borrowing from the clean, structured approach popularized by system design experts like Alex Xu, a successful ML design response follows a four-tier structure. 1. Clarify Requirements and Scope the Problem