Cracking the System Design Interview
A complete crash course to ace your system design interview. From frameworks and estimation techniques to designing real systems like WhatsApp, YouTube, Uber, and more — with architecture diagrams, API designs, and deep dives into scalability.
System design interviews are the most feared round in senior engineering interviews — and for good reason. There’s no single “correct” answer, the scope is enormous, and interviewers are evaluating you on dimensions you might not even realize.
This crash course breaks down everything you need to know, from the fundamentals to full system designs.
What You’ll Learn
Foundation (Lessons 1–4): Understand what interviewers actually evaluate, learn a repeatable framework for structuring your answer, master back-of-envelope estimation, and build a mental toolbox of common components.
Real System Designs (Lessons 5–13): Walk through 9 classic system design problems end-to-end — chat systems, video streaming, ride-sharing, search engines, e-commerce, payments, distributed caches, rate limiters, and web crawlers. Each lesson follows a consistent structure: requirements gathering, API design, high-level architecture, and deep dives into the hard problems.
Interview Mastery (Lessons 14–15): Learn the common mistakes that sink candidates and walk through a complete mock interview to see the framework in action.
Who This Is For
- Software engineers preparing for senior/staff-level interviews at top tech companies
- Engineers who can code but struggle with open-ended design questions
- Anyone who wants to build a systematic approach to system design
Prerequisites
- Basic understanding of web applications (HTTP, REST APIs, databases)
- Familiarity with at least one programming language
- Some experience building or working on backend systems
Let’s get started.