Leo’s heart stopped. That was exactly the anti-rate-limiter concept from page 47 of the ghost PDF.

As a software engineer, preparing for system design interviews can be a daunting task. The pressure to perform well is high, and the competition is fierce. However, with the right resources and preparation, you can increase your chances of success. In this article, we'll take a closer look at Alex Wu's PDF and GitHub resources, which have become exclusive go-to materials for many engineers preparing for system design interviews.

If you are looking for high-quality system design PDFs or repositories, these are the most widely recognized "exclusive" resources: System Design Interview (Alex Xu)

If you have the PDF but no practice partner, you will fail. The "Exclusive" resource isn't the file; it's the ability to whiteboard. Use the PDF to memorize the "Top 10 bottlenecks" (Database indexes, CDN, Message queue), then open a shared Google Jamboard or Excalidraw and practice.

Leo never saw the GitHub repo again. It was gone by morning, replaced by a single README:

The PDF is just a snapshot. The interview is a conversation. You cannot cheat a conversation. You can only prepare for it. And the best preparation starts with understanding the architecture, not cracking a DRM.