iosNudge

iOS System Design Playbook

A clear, step-by-step way to answer mobile system design rounds: requirements, architecture, data, APIs, deep dives and trade-offs.

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  1. 01
    Introduction

    What a mobile system design round is, what interviewers check, and how it is different from a backend design round.

  2. 02
    The 45-Minute Framework

    A step-by-step plan for the round, with time boxes, what to say at each step, and a worked example.

  3. 03
    Requirements

    How to turn a vague prompt into a clear scope. Functional and non-functional needs for mobile, and the questions worth asking.

  4. 04
    Architecture

    How to split an app into layers and modules, how dependency injection works, and how to show it with a diagram and Swift protocols.

  5. 05
    Data and APIs

    Network models vs app models, where to store data on iOS, how the app talks to the server, cursor vs offset pagination, and API contracts.

  6. 06
    Deep Dives

    Caching, offline sync, real-time updates, images, background work, concurrency and errors, with Swift for each.

  7. 07
    Performance and Observability

    Launch time, smooth scrolling, memory and battery, plus logs, metrics, crash reports, feature flags and gradual rollout.

  8. 08
    Common Mistakes

    What weak mobile system design answers look like, and a better version of each one.