The System Design Interview Framework

What you get

• The 6-step framework that works for any prompt
• 3 fully worked designs with real architecture diagrams
• Caching, DB scaling, queues, and load balancing patterns
• Vocabulary cheat sheet — the exact terms that matter
• How grading actually works — the hidden rubric
• Common mistakes that quietly cost points

What's inside

1. The Framework: 6 Steps, Every Time
2. Worked Example 1: URL Shortener
3. Worked Example 2: On-Call Alerting System
4. Worked Example 3: CI/CD for 50+ Microservices
5. The Complete Pattern Catalog: Caching, Database Scaling, Queues & Load Balancing
6. Vocabulary Cheat Sheet
7. Common Mistakes That Cost Points
8. How Grading Actually Works
9. Practice Template (Fill From Memory Before Every Interview)

A look inside: The Framework: 6 Steps, Every Time

Use this exact structure in every system design interview, regardless of the prompt. Interviewers grade your process as much as your final answer — and this process is what you're being graded on.

1. Clarify Requirements — What's the scale? (requests/sec, users, data volume). Must-haves vs. nice-to-haves? Latency/availability requirements? Read-heavy or write-heavy? Ask 2–4 sharp questions BEFORE drawing anything.

5. Failure Modes & Reliability — What happens if a component goes down? Single points of failure? Retry strategy? Monitoring? Most candidates skip this — it's often the difference between pass and fail.

6. Trade-offs & Wrap-Up — State explicitly what you optimized for and what you sacrificed. What would you do differently with more time? Naming trade-offs signals senior-level judgment.