Introduction: The Interview Playbook

A mobile system design interview tests both your design decisions and your ability to explain them. A good design is difficult to assess if the interviewer cannot follow the data, the user action, or the reason for a choice.

This chapter explains how to present your work, respond to changes, and practice under a time limit. The plans are practice tools, not rules followed by every employer.

Confirm the Format First

Ask how much time you have and what you should design. The task may focus on the mobile app, an SDK, the app and its backend, or a working implementation.