A Framework for System Design Interviews
"Design Twitter" in 45 minutes? Nobody can design a real product in an hour. That's not the point. A system design interview simulates two coworkers solving an ambiguous problem together. This chapter gives you a 4-step framework you can apply to every design question in the rest of this course.
- 3.1What the interviewer is really looking forThe final design matters less than the work you put into it. Interviewers watch for: Your ability to collaborate and take feedback Working…
- 3.2The 4-step process (and the clock)Every design interview, and every design chapter in this course, follows the same four steps. In a typical 45-minute interview the time…
- 3.3Step 1: Understand the problem and establish the design scopeJumping straight into a solution is a big red flag. Slow down. Think deeply and ask questions to clarify requirements and assumptions. If…
- 3.4Step 2: Propose a high-level design and get buy-inNow develop a high-level design together with the interviewer. Treat them as a teammate. Draft an initial blueprint and ask for feedback.…
- 3.5Step 3: Design deep diveBy now you and the interviewer have agreed on the goals, the feature scope and a high-level blueprint, and you know which areas to focus…
- 3.6Step 4: Wrap up, plus dos and don'tsIn the final minutes, the interviewer may ask follow-up questions or let you discuss other points: Bottlenecks and improvements. Never say…