Mobile developer interview preparation, round by round

Android Interview Questions (Amit Shekhar)↗

GitHub repo · amitshekhariitbhu/android-interview-questions

A topic-by-topic Android question checklist on Kotlin, coroutines, Flow, Compose, architecture and system design, with answers mostly in the author's free posts.

Best for a checklist of what Android interviews cover

Also in System design

Hacking with Swift Interview Questions↗

Website · hackingwithswift.com

Over 150 iOS interview questions across Swift, SwiftUI, UIKit, performance and security, each with a free note on how to approach the answer.

Best for iOS candidates practising how to talk through Swift and Apple-platform questions

React Docs (react.dev)↗

Official guide · react.dev

The React team's official docs, with interactive lessons on components, state, effects and the escape hatches interviewers like to probe.

Best for precise, current answers on hooks, rendering and effects

The Swift Programming Language (official book)↗

Official guide · docs.swift.org

The Swift project's official language book, including chapters on concurrency, memory safety and automatic reference counting.

Best for precise answers on value versus reference types, ARC, optionals and async/await

Flutter App Architecture Guide↗

Official guide · docs.flutter.dev

The Flutter team's official advice on layering apps, managing state, injecting dependencies and structuring data flow, with a worked case study.

Best for Flutter architecture and state-management design questions

Also in System design

Guide to App Architecture (Android Developers)↗

Official guide · developer.android.com

Google's official guidance on splitting Android apps into UI, domain and data layers with unidirectional data flow and dependency injection.

Best for answering Android architecture and app-design questions the way Google frames them

Also in System design

Kotlin Coroutines Guide↗

Official guide · kotlinlang.org

JetBrains' official guide to coroutines, structured concurrency, cancellation, flows and channels.

Best for the coroutine and Flow questions that appear in almost every Android loop

Thinking in Compose (Android Developers)↗

Official guide · developer.android.com

The official explainer of Jetpack Compose's declarative model, covering composable functions, recomposition and why composables must avoid side effects.

Best for the recomposition, state and side-effect questions now common in Android interviews

React Native Architecture docs↗

Official guide · reactnative.dev

The official explanation of React Native's New Architecture: the Fabric renderer, TurboModules, native modules and the threading model.

Best for mid and senior React Native candidates asked about Fabric, TurboModules and performance

Mobile System Design↗

GitHub repo · weeeBox/mobile-system-design

A practical framework for iOS and Android design rounds, worked through on a sample feed app from requirements to client architecture, API, storage, offline sync and paging.

Best for mobile engineers whose design round is about the client app, not backend infrastructure

Meta Careers - Preparing for your full loop (SWE)↗

Official guide · metacareers.com

Meta's official prep page for software engineers who have reached the onsite stage, whose main value is the free Full Loop Interview Guide it links to.

Best for candidates with a Meta onsite scheduled (confirm the exact rounds with your recruiter)

Also in Coding and DSA, Resume, companies and offers

interviewing.io - Mock interview replays↗

Practice site · interviewing.io

A free library of recorded, anonymised mock interviews run by big-tech engineers, filterable by company, round and level, with paid live mocks available.

Best for watching real interviewer feedback on coding, design and behavioral rounds before your own mocks

Also in Coding and DSA

Tech Interview Handbook↗

Website · techinterviewhandbook.org

An open-source guide to the whole software interview process, from picking a language and drilling algorithm topics to resumes, behavioral answers and offer negotiation.

Best for planning your coding-interview prep from start to finish

Also in Resume, companies and offers

Grind 75↗

Website · techinterviewhandbook.org

A study-plan generator that turns a ranked list of high-frequency LeetCode problems into a week-by-week schedule sized to the hours you have.

Best for candidates with a fixed number of weeks who want the highest-value problem list

NeetCode Roadmap (NeetCode 150)↗

Website · neetcode.io

A visual topic map of 150 core LeetCode problems, each linked to a free video walkthrough on the NeetCode YouTube channel.

Best for learning problem patterns topic by topic, with a video solution for every problem

LeetCode↗

Practice site · leetcode.com

The default site for interview-style coding practice: thousands of problems, free study plans such as Top Interview 150 and SQL 50, and weekly contests.

Best for daily practice and timed contests (Premium mainly adds company-tagged lists)

Refactoring.Guru: Design Patterns↗

Website · refactoring.guru

A free, illustrated catalogue of the 22 classic design patterns, each with the problem it solves, a structure diagram, trade-offs and sample code in many languages.

Best for learning or revising design patterns before LLD rounds

Head First Design Patterns, 2nd Edition↗

Book · wickedlysmart.com

A visual, example-heavy introduction to object-oriented design principles and the most-used design patterns in Java, for readers who find the Gang of Four text too dry.

Best for freshers and career-switchers who need LLD foundations before practising problems

interviewing.io - Senior engineer's guide to FAANG interviews↗

Website · interviewing.io

A free long-read built from talks with FAANG interviewers that compares how Meta, Amazon, Apple, Netflix, Google and Microsoft run their loops and team matching.

Best for experienced engineers planning a FAANG or big-tech job search end to end