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Mobile App Development Interview Questions in Gurgaon

36 practice questions with answers for Mobile App Development interviews in Gurgaon.

Mobile App Development jobs in Gurgaon

Gurgaon (Gurugram) is home to many multinational, consulting, fintech and consumer-internet offices. Interviews often expect strong business understanding along with technical skills, especially for analytics and product-facing roles.

Below are 36 questions that match the mix of service, product and domain employers hiring junior mobile app developers in Gurgaon.

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01

What is BuildContext?

Dart and Flutter BasicsMedium
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BuildContext is a handle to a widget's location in the element tree. It is used to look up inherited data like Theme.of(context), MediaQuery and Navigator, and providers. Each widget's build method gets its own context. Common mistakes are using a context from above a widget that provides data, or using a context after an async gap when the widget may be unmounted; check context.mounted before using it after await.
02

Compare Redux Toolkit, Zustand and React Context for state in React Native.

React Native Navigation, State and Native ModulesMedium
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Context is built in and fine for rarely changing values like theme or auth, but every consumer re-renders on change. Redux Toolkit gives a predictable global store with slices, middleware and excellent DevTools, suited to large teams, and RTK Query handles API caching. Zustand is small and simple, with selector-based subscriptions that limit re-renders. Server data is often better handled by TanStack Query than by any global store.
03

Write a React Native component that requests location permission and shows the coordinates using Expo.

React Native CoreMedium
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import * as Location from 'expo-location'; export function MyLocation() { const [coords, setCoords] = useState(null); const [error, setError] = useState(null); useEffect(() => { (async () => { const { status } = await Location.requestForegroundPermissionsAsync(); if (status !== 'granted') { setError('Location permission denied'); return; } const pos = await Location.getCurrentPositionAsync({}); setCoords(pos.coords); })(); }, []); if (error) return <Text>{error}</Text>; if (!coords) return <ActivityIndicator />; return <Text>{coords.latitude}, {coords.longitude}</Text>; }
04

A user reports that they cannot find your app in the store on their old phone. Why could this happen?

App Store and Play Store PublishingMedium
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The app may not be available for their device because the minimum OS version is higher than theirs, the device lacks a required hardware feature declared in the manifest, the app is not released in their country, or the device architecture is excluded. Check the device catalogue in Play Console and the deployment target on iOS. Decide whether supporting that segment is worth lowering requirements.
05

After a release, crash reports show a spike only on one Android OS version. What steps do you take?

Testing, Performance and CI/CDMedium
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Pause the staged rollout to limit impact. Filter crash reports by OS version and device to find the top stack trace, and check behaviour changes for that version, such as permission, background or edge-to-edge rules. Reproduce on an emulator of that version, fix it, add a regression test and resume rollout with a hotfix. Add that OS version to the regular test device matrix.
06

Write a React Native function that uploads an image with progress using Expo FileSystem.

Mobile Backend, APIs and FirebaseHard
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import * as FileSystem from 'expo-file-system'; export async function uploadImage(uri, token, onProgress) { const task = FileSystem.createUploadTask( 'https://api.example.com/upload', uri, { httpMethod: 'POST', uploadType: FileSystem.FileSystemUploadType.MULTIPART, fieldName: 'file', headers: { Authorization: `Bearer ${token}` }, }, ({ totalBytesSent, totalBytesExpectedToSend }) => onProgress(totalBytesSent / totalBytesExpectedToSend) ); const res = await task.uploadAsync(); if (res.status !== 200) throw new Error('Upload failed'); return JSON.parse(res.body); }
07

What is the difference between a debug and release build in mobile apps?

Mobile Development FundamentalsEasy
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Debug builds include debugging tools, hot reload, assertions and unoptimised code, so they are slower and larger. Release builds are compiled ahead of time, minified, optimised and signed with a release key. In Flutter, debug uses JIT while profile and release use AOT compilation; in React Native, release bundles minified JavaScript precompiled to Hermes bytecode. Always measure performance and test critical flows on release or profile builds.
08

How does token-based authentication work in mobile apps?

Mobile Backend, APIs and FirebaseMedium
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The user signs in and the server returns a short-lived access token, often a JWT, and a longer-lived refresh token. The app stores them securely in Keychain or Keystore-backed storage and sends the access token in the Authorization header. When it expires, the app uses the refresh token to get a new one, retrying the failed request. On logout, tokens are deleted and ideally revoked on the server.
09

How do you detect and fix memory leaks in cross-platform apps?

Testing, Performance and CI/CDMedium
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Leaks usually come from subscriptions, timers, controllers and listeners that are never disposed, or global caches that grow without limits. In Flutter, dispose controllers and cancel stream subscriptions in dispose, and check the DevTools memory view for growing instances. In React Native, return cleanup functions from useEffect and remove event listeners. Repeatedly open and close a screen while profiling to confirm memory returns to baseline.
10

Where should you keep API keys and secrets in a mobile app?

Mobile Backend, APIs and FirebaseEasy
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Anything bundled in a mobile app can be extracted by decompiling, so never ship true secrets like payment secret keys or admin credentials. Keep them on your backend and let the app call your server. Public client keys, such as maps or Firebase config, are acceptable but should be restricted by app package name, bundle ID and certificate fingerprint. Use environment configuration in CI rather than committing keys to the repository.
11

Your app works on Android but crashes immediately on iOS when the user taps the camera button. What is the likely cause?

Mobile Development FundamentalsEasy
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The most common cause is a missing NSCameraUsageDescription key in Info.plist. iOS terminates the app when it requests a protected resource without a usage description string. Add descriptions for camera, photo library, microphone and location as required by the plugin, written clearly for the user. Also verify the plugin's iOS setup steps, run pod install, and test on a real device since simulators lack cameras.
12

How does navigation work in React Native with React Navigation?

React Native Navigation, State and Native ModulesEasy
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React Navigation provides navigators: native stack for push and pop screens using platform transitions, bottom tabs, drawer and material top tabs. You nest navigators, for example tabs inside a root stack with modal screens. Screens receive navigation and route props or use hooks like useNavigation and useRoute. Version 7 adds a static configuration API for better TypeScript inference and automatic deep link setup.
13

What are over-the-air updates and what are their limits?

App Store and Play Store PublishingMedium
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Over-the-air updates push new JavaScript bundles and assets to React Native apps without a store release, using services like EAS Update. They fix bugs quickly but can only change JavaScript and assets, not native code, permissions or SDK versions, which need a new build. Store policies allow them only if the app's core purpose does not change. Use runtime versions to ensure updates match compatible native builds, and roll out gradually.
14

What is Metro?

React Native CoreMedium
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Metro is the JavaScript bundler for React Native. It resolves modules, transforms code with Babel, and serves the bundle to the app during development with Fast Refresh. For release builds, it produces a minified bundle that is compiled to Hermes bytecode. It supports platform-specific extensions, asset handling and configuration in metro.config.js for things like SVG transformers or monorepo setups with watch folders.
15

Users get logged out randomly. The access token refresh seems to fail sometimes. What could be wrong?

Mobile Backend, APIs and FirebaseHard
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A common cause is a race condition: several requests receive 401 at once and each triggers a refresh, so later refreshes use an already rotated refresh token and fail, logging the user out. Fix it by allowing only one refresh at a time and queueing other requests until it completes, then retrying them with the new token. Also check device clock issues, token expiry settings and secure storage read failures.
16

A Flutter screen shows a yellow and black overflow stripe on small phones. How do you fix it?

Dart and Flutter BasicsEasy
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The overflow stripe means content exceeds the available space, often a Row with long text or a Column taller than the screen. Wrap text in Expanded or Flexible with overflow ellipsis, make the screen scrollable with SingleChildScrollView or a ListView, use LayoutBuilder to adapt for narrow widths, and avoid fixed heights. Also handle the keyboard by allowing the content to scroll when it opens.
17

Write a GitHub Actions workflow that runs Flutter tests on every pull request.

Testing, Performance and CI/CDMedium
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name: flutter-ci on: pull_request: branches: [main] jobs: test: runs-on: ubuntu-latest steps: - uses: actions/checkout@v4 - uses: subosito/flutter-action@v2 with: channel: stable cache: true - run: flutter pub get - run: dart format --set-exit-if-changed . - run: flutter analyze - run: flutter test --coverage
18

A security audit finds that the app stores the access token in plain shared preferences. How do you fix it?

Testing, Performance and CI/CDMedium
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Move tokens to secure storage backed by Keychain on iOS and Keystore on Android, such as flutter_secure_storage or expo-secure-store. Migrate existing users by reading the old value once, writing it securely and deleting the plain copy. Shorten access token lifetime, use refresh tokens, exclude sensitive files from backups, and clear tokens on logout. Retest with the audit team to confirm the issue is closed.
19

How do you set up multiple environments such as dev, staging and production in a mobile app?

Mobile Development FundamentalsMedium
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Create build flavours on Android and schemes or configurations on iOS, each with its own app ID suffix, app name, icon and API base URL, so all can be installed side by side. In Flutter, use --flavor with --dart-define-from-file for config values; in React Native, use react-native-config or Expo app config with environment variables. Keep secrets out of the repo and set them in CI.
20

Write a Riverpod provider that fetches data asynchronously and display it in a widget.

Flutter State Management and ArchitectureMedium
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final productsProvider = FutureProvider.autoDispose<List<Product>>((ref) { final repo = ref.watch(productRepositoryProvider); return repo.fetchProducts(); }); class ProductsView extends ConsumerWidget { const ProductsView({super.key}); @override Widget build(BuildContext context, WidgetRef ref) { final products = ref.watch(productsProvider); return products.when( loading: () => const Center(child: CircularProgressIndicator()), error: (e, _) => const Center(child: Text('Failed to load')), data: (items) => ListView(children: [for (final p in items) ListTile(title: Text(p.name))]), ); } }
21

A global Redux store causes the whole app to re-render on every small change. How do you fix it?

React Native Navigation, State and Native ModulesMedium
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Components are probably selecting large parts of state or creating new objects in selectors. Select only the fields each component needs with useSelector, memoise derived data with createSelector, and keep state normalised. Move server data to RTK Query or TanStack Query and local UI state back into components. Verify improvements with the React profiler, checking which components render after each action.
22

Explain the Bloc pattern and Cubit.

Flutter State Management and ArchitectureMedium
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In Bloc, the UI adds events, the Bloc handles them with on<Event> handlers and emits new immutable states, and widgets rebuild with BlocBuilder or react with BlocListener. A Cubit is a simpler version where the UI calls methods directly and the Cubit emits states, without event classes. Use Cubit for straightforward logic and full Bloc when you need event transformations like debounce or detailed traceability.
23

Write a Flutter widget test that taps a button and checks the counter text.

Testing, Performance and CI/CDEasy
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testWidgets('increments counter on tap', (tester) async { await tester.pumpWidget(const MaterialApp(home: Scaffold(body: Counter()))); expect(find.text('Count: 0'), findsOneWidget); await tester.tap(find.text('Add')); await tester.pump(); expect(find.text('Count: 1'), findsOneWidget); });
24

What is the difference between REST and GraphQL for mobile clients?

Mobile Backend, APIs and FirebaseMedium
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REST exposes resources at fixed endpoints, which can lead to over-fetching or many round trips for one screen. GraphQL exposes one endpoint where the client asks exactly for the fields it needs, reducing payload size and requests, which helps on slow mobile networks. GraphQL adds complexity in caching, error handling and server performance. Clients like Apollo or graphql_flutter provide normalised caching and code generation.
25

When would you choose a cross-platform framework over native development?

Mobile Development FundamentalsEasy
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Choose cross-platform when you need both Android and iOS quickly with a small team, the app is mostly forms, lists, content and API-driven screens, and design consistency across platforms is desired. Choose native when the app needs heavy graphics, deep hardware integration, advanced background processing, newest platform features on day one, or very tight performance. Many companies mix both, using native modules inside a cross-platform app.
26

What are isolates and when should you use them?

Dart and Flutter BasicsMedium
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Isolates are Dart's units of concurrency, each with its own memory and event loop, communicating by messages. Heavy CPU work like parsing a large JSON file, image processing or encryption on the main isolate causes jank. Use Isolate.run or compute to run such work in a separate isolate and return the result. For network or file I/O, async-await is enough because that work is not CPU-bound.
27

What are TestFlight and Play testing tracks?

App Store and Play Store PublishingEasy
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TestFlight distributes iOS beta builds to internal testers on your team and external testers, up to 10,000, after a light beta review. Play Console offers internal testing for quick distribution to up to 100 testers, closed testing for selected groups, and open testing for anyone to join. Using these tracks catches device-specific bugs and gathers feedback before production, and staged rollouts then limit risk further.
28

Write a custom hook that fetches data with loading and error states.

React Native CoreMedium
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function useFetch(url) { const [state, setState] = useState({ data: null, loading: true, error: null }); useEffect(() => { const controller = new AbortController(); fetch(url, { signal: controller.signal }) .then((r) => { if (!r.ok) throw new Error('HTTP ' + r.status); return r.json(); }) .then((data) => setState({ data, loading: false, error: null })) .catch((e) => { if (e.name !== 'AbortError') setState({ data: null, loading: false, error: e.message }); }); return () => controller.abort(); }, [url]); return state; }
29

How do you handle account deletion requirements in mobile apps?

App Store and Play Store PublishingMedium
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Both major stores require apps that let users create accounts to also let them delete their account from within the app, and the Play Store also requires a web link for deletion requests. Implement a clear settings option, confirm the action, call a backend endpoint that deletes or anonymises user data according to retention rules, revoke tokens, clear local data and sign the user out. Document what is retained for legal reasons.
30

What is hot reload and how is it different from hot restart?

Mobile Development FundamentalsEasy
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Hot reload injects changed code into the running app and rebuilds the UI while keeping the current state, so you see changes in about a second. Hot restart reloads the whole app code and resets state, needed when changing initialisation logic, global variables or app startup. React Native offers Fast Refresh, similar to hot reload. Native code changes, such as new plugins or platform files, require a full rebuild.
31

Write a Dart model class with fromJson and toJson.

Dart and Flutter BasicsEasy
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class Product { const Product({required this.id, required this.name, required this.price}); final String id; final String name; final double price; factory Product.fromJson(Map<String, dynamic> json) => Product( id: json['id'] as String, name: json['name'] as String, price: (json['price'] as num).toDouble(), ); Map<String, dynamic> toJson() => {'id': id, 'name': name, 'price': price}; } // For larger apps use json_serializable or freezed to generate this.
32

How do you implement OTP login with a phone number?

Mobile Backend, APIs and FirebaseMedium
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The user enters a phone number, the backend or an auth service sends an OTP via SMS and returns a verification ID. The user enters the code, which is verified to issue session tokens. On Android, use the SMS Retriever or User Consent API to auto-read the code without SMS permissions; on iOS, set the text content type to one-time code for autofill. Rate-limit requests, expire codes quickly and protect against abuse.
33

How do you implement a form with validation in Flutter?

Dart and Flutter BasicsMedium
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Wrap fields in a Form with a GlobalKey<FormState>, use TextFormField with a validator function that returns an error string or null, and call formKey.currentState!.validate() on submit. Use TextEditingController for values and dispose it, set keyboardType and textInputAction for each field, and autovalidateMode onUserInteraction to show errors as the user types. Keep validation rules in testable functions outside widgets.
34

How do you debug a React Native app?

React Native CoreMedium
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Use React Native DevTools, the default debugger since 0.76, for console logs, breakpoints, React component inspection and profiling. Inspect network requests with the network panel or a proxy. For native crashes, check Logcat in Android Studio and the Xcode console. Use the performance monitor overlay for frame rates, and add a crash reporting tool like Sentry or Crashlytics for production errors with source maps uploaded.
35

How do push notifications work end to end?

Mobile Backend, APIs and FirebaseMedium
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The app registers with the platform push service, FCM on Android and APNs on iOS, often both through FCM, and receives a device token. The app sends this token to your backend, linked to the user. When an event happens, the backend sends a message to FCM or APNs with the token, which delivers it to the device. The app requests notification permission, handles taps to open the right screen, and refreshes tokens when they change.
36

What is Dart and why does Flutter use it?

Dart and Flutter BasicsEasy
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Dart is a typed, object-oriented language created for client development. Flutter uses it because Dart supports JIT compilation for fast hot reload in development and AOT compilation to native machine code for fast release apps. Dart has sound null safety, async-await, isolates for concurrency, and a garbage collector optimised for many short-lived objects, which suits Flutter's frequent widget rebuilding.

Companies with offices in Gurgaon (7)

E-commerce & consumer tech

Zomato

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Gurugram

View questions
E-commerce & consumer tech

Nykaa

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Mumbai, Gurugram, Bengaluru

View questions
E-commerce & consumer tech

Lenskart

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Gurugram, Bengaluru

View questions
Product

Urban Company

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Gurugram

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E-commerce & consumer tech

MakeMyTrip

Mobile App Development interview questions

  • 30 questions
  • 5 rounds

Gurugram, Bengaluru

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IT services

Nagarro

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Gurugram, Jaipur

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IT services

GlobalLogic

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Noida, Bengaluru, Gurugram +2

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Frequently asked questions

Which companies hire Mobile App Development professionals in Gurgaon?

Companies with large offices in Gurgaon include Zomato, Nykaa, Lenskart, Urban Company, MakeMyTrip, Nagarro, GlobalLogic. Use their company pages below to practise employer-specific sets.

Are Mobile App Development interviews in Gurgaon different from other cities?

The questions depend more on the company than the city. Gurgaon's mix of employers decides the style: Interviews often expect strong business understanding along with technical skills, especially for analytics and product-facing roles

How do I find Mobile App Development jobs in Gurgaon?

Shortlist companies with Gurgaon offices, keep your CV focused on Mobile App Development projects, apply on company career pages and job portals with the Gurgaon filter, and practise the questions on this page before each interview.

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