Correction note for readers: If you are confusing this with , note that Xu writes published books. Lu’s strength is in open-source, diagram-heavy cheat sheets.
: Sketch the main components (load balancers, web servers, databases) and get the interviewer's approval before proceeding. Design deep dive
Decoupling heavy computations (e.g., video encoding, email notifications). Cassandra, DynamoDB
| Feature | Alex Lu PDF (Free) | Alex Xu Book ($40) | Grokking the Sys Design (Course) | | :--- | :--- | :--- | :--- | | | High-level (Interview passing) | Very Deep (Production ready) | Medium | | Diagrams | Black & white, functional | High quality, color | Interactive | | Best For | Last-minute revision (48 hours before interview) | Deep learning (2 months prep) | Structured learning | | Estimation | Excellent cheat sheet | Decent | Basic | Alex Lu System Design Interview Pdf
Which (e.g., Feed, Chat, Uber) are you actively practicing? What is your target engineering level (Mid, Senior, Staff)? How much time do you have before your interviews begin?
Have you used the Alex Lu method? Share your interview experience in the comments below. And remember: In system design, there are no right answers, only trade-offs explained well.
For those who prefer physical books to annotate or standard digital Kindle reading. Correction note for readers: If you are confusing
This is where you earn your senior engineering leveling. The interviewer will pick 1 or 2 areas to stress-test.
Use the Alex Lu PDF as your "Cram Sheet." Use Alex Xu’s books for deep homework.
If you have a system design interview coming up, Alex Xu's material is absolutely worth your time and financial investment. It removes the ambiguity from architectural interviews and gives you a structured, predictable way to showcase your engineering expertise. Design deep dive Decoupling heavy computations (e
She got the offer. Her feedback explicitly mentioned "Structured, scalable architecture thinking."
Never state that a specific technology is "the best." Practice phrases taught in the book, such as: "Using a SQL database gives us strong ACID compliance for transactions, but we will sacrifice horizontal write scalability compared to a NoSQL alternative like Cassandra." Official Platforms vs. Unauthorized PDFs
Which (e.g., TinyURL, Uber Rides, TikTok Feed) do you find the most challenging?