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Mobile App Development Interview Questions in Bangalore

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

Mobile App Development jobs in Bangalore

Bangalore (Bengaluru) is India's largest technology hub, with global product companies, engineering centres, unicorn start-ups and big IT-services campuses. Product-company interviews here are usually deeper, with more scenario, design and hands-on rounds.

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

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01

How do deep links and universal links work?

Mobile Development FundamentalsMedium
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Deep links open a specific screen in your app from a URL. Custom schemes like myapp://order/42 work but are not verified. Verified HTTPS links are App Links on Android, using assetlinks.json, and Universal Links on iOS, using an apple-app-site-association file on your domain. When verified, the link opens your app directly instead of the browser. The routing library, like go_router or React Navigation linking, maps URLs to screens.
02

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.
03

How do you reduce app size for Flutter and React Native apps?

Testing, Performance and CI/CDMedium
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Publish Android App Bundles so users download only their architecture and density resources. In Flutter, use --split-debug-info and --obfuscate, remove unused packages and fonts, compress images and use tree-shaken icons. In React Native, enable Hermes, R8 minification and resource shrinking, and remove heavy libraries. For both, analyse size with tools like flutter build --analyze-size or APK Analyzer and lazy-load large assets.
04

After an API call finishes, the app throws an error about using BuildContext across async gaps or setState after dispose. How do you fix it?

Dart and Flutter BasicsMedium
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The user left the screen before the Future completed, so the widget was unmounted. Before using context or calling setState after await, check if (!context.mounted) return; or if (!mounted) return; in State. Better still, move async logic out of widgets into a state management layer that the UI listens to, and cancel subscriptions or timers in dispose so no callbacks run on a dead widget.
05

What is clean architecture in a Flutter app?

Flutter State Management and ArchitectureMedium
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Clean architecture separates code into presentation (widgets and state notifiers or blocs), domain (entities, use cases and repository interfaces) and data (repository implementations, API clients, local storage and DTOs). Dependencies point inward, so the domain knows nothing about Flutter or HTTP. It improves testability and lets you swap data sources. For small apps it may be heavy, so many teams keep presentation and data layers and add domain only when logic grows.
06

The app takes six seconds to start on low-end phones. How do you improve it?

Testing, Performance and CI/CDHard
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Measure cold start on a release or profile build and trace what runs before the first frame. Defer non-critical SDK initialisation such as analytics and ads, avoid large synchronous storage reads and network calls before showing UI, load the first screen with cached data, and lazy-load other features. In Flutter, keep main() light; in React Native, use Hermes and inline requires. Use a native splash screen to avoid a blank screen.
07

How does Flutter render UI differently from React Native?

Mobile Development FundamentalsMedium
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Flutter draws every pixel itself using its own rendering engine, Impeller, onto a canvas, so widgets look identical across platforms and do not depend on native UI components. React Native maps components like View and Text to real native views, so the UI uses platform controls. Flutter gives pixel consistency and predictable performance; React Native gives native look and easier reuse of native view libraries, plus web developer familiarity with JavaScript.
08

What is the freezed package used for?

Flutter State Management and ArchitectureMedium
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freezed generates immutable data classes with copyWith, equality, toString and union types or sealed classes, and integrates with json_serializable for fromJson and toJson. It removes boilerplate when modelling state such as loading, data and error variants. You annotate a class, run build_runner, and get generated code in a part file. With Dart 3 sealed classes and records, some teams need it less, but it is still widely used.
09

Write a Redux Toolkit slice for a cart.

React Native Navigation, State and Native ModulesMedium
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const cartSlice = createSlice({ name: 'cart', initialState: { items: [] }, reducers: { addItem(state, action) { const existing = state.items.find((i) => i.id === action.payload.id); if (existing) existing.qty += 1; else state.items.push({ ...action.payload, qty: 1 }); }, removeItem(state, action) { state.items = state.items.filter((i) => i.id !== action.payload); }, }, }); export const { addItem, removeItem } = cartSlice.actions; export const selectTotal = (s) => s.cart.items.reduce((t, i) => t + i.price * i.qty, 0);
10

Users say the app does not work properly on foldable phones and tablets. What do you check?

Mobile Development FundamentalsHard
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Check whether orientation is locked, layouts use fixed widths, and screens assume phone dimensions. Make layouts adapt by width breakpoints with two-pane layouts on wide screens, handle configuration and size changes without losing state, and avoid hardcoding aspect ratios. Recent Android versions ignore orientation locks on large screens, so locking is no longer a fix. Test with resizable emulators, foldable postures and split-screen mode.
11

How do you handle navigation in Flutter with go_router?

Flutter State Management and ArchitectureEasy
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go_router is a declarative, URL-based routing package maintained by the Flutter team. You define GoRoute entries with paths like /product/:id, navigate with context.go or context.push, and read parameters from state.pathParameters. It supports nested navigation with ShellRoute for bottom tabs, redirects for authentication guards, and deep links on mobile and web. It wraps the Router API, which is complex to use directly.
12

How does Flutter's layout rule of constraints go down, sizes go up work?

Dart and Flutter BasicsHard
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A parent passes constraints, minimum and maximum width and height, to each child. The child chooses its size within those constraints and reports it up, then the parent positions the child. A widget cannot choose a size outside its constraints, which explains why a Container with width 100 may still fill the screen if forced by tight constraints. Understanding this rule solves most overflow and unbounded constraint errors.
13

How would you set quality gates before a mobile release?

Testing, Performance and CI/CDHard
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Define clear criteria: all automated tests pass, no open critical or high bugs, crash-free rate in beta above an agreed threshold like 99.5 percent, performance budgets for startup time and app size met, accessibility checks on new screens, and security review for sensitive changes. Run smoke tests on the release build on real devices. Release with a staged rollout and monitor metrics before expanding.
14

Explain the mobile app lifecycle states on Android and iOS.

Mobile Development FundamentalsMedium
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Both platforms move apps between foreground active, inactive, background and terminated states. On iOS, an app goes inactive during interruptions like calls, then background, where it gets limited time before suspension. On Android, activities move through resumed, paused and stopped, and the process can be killed in background. Cross-platform apps observe these through AppLifecycleListener in Flutter or AppState in React Native to pause work and save data.
15

Your team has no automated tests and frequent regressions. How would you introduce testing?

Testing, Performance and CI/CDMedium
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Start where bugs hurt most: write unit tests for business logic like pricing, validation and state transitions, and a few end-to-end smoke tests for login, checkout and payment flows with Maestro or integration tests. Run them in CI on every pull request so failures block merges. Require tests for bug fixes going forward. Show reduced regressions after a few sprints to build team support.
16

What is app signing and why must you protect the keys?

App Store and Play Store PublishingMedium
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Signing proves the app comes from you and that updates are from the same developer. On Android, you sign uploads with an upload key and Play App Signing re-signs with the app signing key held by the store; a lost upload key can be reset, but losing a self-managed app key meant you could never update the app. On iOS, signing uses certificates and provisioning profiles. Store keys in a secure vault and CI secrets, never in the repository.
17

Write a React Native Testing Library test for a login button showing a validation error.

Testing, Performance and CI/CDEasy
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import { render, screen, fireEvent } from '@testing-library/react-native'; test('shows error when email is empty', () => { render(<LoginScreen onSubmit={jest.fn()} />); fireEvent.press(screen.getByRole('button', { name: 'Login' })); expect(screen.getByText('Email is required')).toBeTruthy(); });
18

What is the role of a mobile developer in an Agile team?

Mobile Development FundamentalsEasy
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A mobile developer turns user stories and designs into working app features, estimates tasks in sprint planning, raises technical risks early, and collaborates with backend, design and QA. They join standups, demos and retrospectives, review peers' code and keep builds releasable. They also give input on platform constraints like store review times and OS limits, which affect release planning more than in web development.
19

How do you set up CI/CD for a cross-platform mobile app?

Testing, Performance and CI/CDMedium
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On every pull request, run lint, formatting checks, unit and widget or component tests. On merge, build signed Android and iOS release artifacts using CI services such as GitHub Actions, Codemagic, Bitrise or EAS Build, with signing keys stored as secrets. Use fastlane or EAS Submit to upload to internal testing tracks and TestFlight. Automate version numbers, generate release notes and run smoke tests with Maestro.
20

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.
21

What are privacy declarations required by the app stores?

App Store and Play Store PublishingMedium
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The Play Store requires a data safety form describing what data is collected, shared, encrypted and deletable, plus a privacy policy link and account deletion option for apps with accounts. The iOS App Store requires privacy nutrition labels, a privacy manifest file for the app and listed third-party SDKs describing data use and required reason APIs, and App Tracking Transparency permission before tracking users across apps.
22

How do you build a release version of a Flutter app for both stores?

App Store and Play Store PublishingMedium
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flutter build appbundle --release --obfuscate --split-debug-info=build/symbols # Output: build/app/outputs/bundle/release/app-release.aab flutter build ipa --release --obfuscate --split-debug-info=build/symbols # Output: build/ios/ipa/*.ipa, upload with Transporter or xcrun altool # Version comes from pubspec.yaml, for example: # version: 2.3.1+45 (name 2.3.1, build number 45)
23

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.
24

How do you balance speed and quality when a client wants features fast?

Mobile Development FundamentalsMedium
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I agree on what quality means for this release, such as no crashes in key flows, working offline basics and tests for payment logic. I deliver the smallest useful version first, behind feature flags if needed, and avoid shortcuts in areas that are expensive to fix later, like data models and security. I make technical debt visible in the backlog with an estimate so it is planned rather than forgotten.
25

How does the keyboard affect layouts in React Native and how do you handle it?

React Native CoreMedium
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When the keyboard opens it can cover inputs, especially at the bottom of the screen. Use KeyboardAvoidingView with behavior padding on iOS, and rely on Android's adjustResize window setting, or use react-native-keyboard-controller for consistent behaviour on both. Wrap forms in a ScrollView with keyboardShouldPersistTaps set to handled so buttons work while the keyboard is open, and dismiss the keyboard on submit.
26

Tell me about a technical decision you made that you later regretted, and what you learned.

Flutter State Management and ArchitectureMedium
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Situation: on an earlier project I chose a lesser-known state management package because it looked simpler. Task: support the app as it grew. Action: when the package stopped being maintained, I led a migration to Riverpod feature by feature with tests. Result: the migration took three sprints. I learned to evaluate packages by maintenance activity, community size and testing support, not just initial simplicity, and to document decisions.
27

How do you measure performance in a Flutter app?

Testing, Performance and CI/CDMedium
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Run the app in profile mode on a real device, not debug or emulator. Use Flutter DevTools: the performance view shows frame build and raster times, the CPU profiler finds expensive functions, and the memory view tracks allocations and leaks. Target under about 16 milliseconds per frame for 60 fps. The performance overlay shows UI and raster thread graphs, and rebuild tracking highlights widgets rebuilding too often.
28

A React Native app shows a red screen error in development: Text strings must be rendered within a Text component. What does it mean?

React Native CoreEasy
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React Native requires every string to be inside a Text component. The error usually appears when a string or a number is placed directly inside a View, or when a conditional like {count && <Badge />} renders 0 as text when count is zero. Wrap text in Text and use explicit conditions like {count > 0 ? <Badge /> : null} so falsy values are not rendered as raw strings.
29

Explain the core React Native components.

React Native CoreEasy
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View is the basic container, like a div, supporting flexbox layout and styles. Text displays text, and all strings must be inside Text. Image shows images from network or local sources. TextInput handles keyboard input. Pressable handles touches with press states. ScrollView scrolls a small amount of content, while FlatList and SectionList render long lists virtually. SafeAreaView or the safe area context library keeps content away from notches.
30

How do you implement authentication flow screens in React Navigation?

React Native Navigation, State and Native ModulesMedium
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Conditionally render screen groups based on auth state: if the user is signed out, the navigator shows login and signup; when signed in, it shows the app screens. Changing state automatically switches stacks and prevents going back to login with the back button. Restore tokens from secure storage on startup while showing a splash screen. Expo Router offers protected routes for the same pattern.
31

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.
32

Integration tests pass locally but fail randomly in CI. How do you make them reliable?

Testing, Performance and CI/CDMedium
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Flaky tests usually come from timing assumptions, shared state, network dependence or slow emulators. Replace fixed delays with waiting for specific conditions, mock or stub network calls with predictable responses, reset app data between tests, and use stable selectors like keys or test IDs instead of text that changes. Give CI emulators enough resources, retry only as a temporary measure, and track flaky tests separately to fix them.
33

How do you design a mobile app for users on low-end devices and poor networks?

Mobile Development FundamentalsMedium
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Keep the app size small, avoid heavy animations on low-end phones, and load images at the right resolution with caching. Use pagination and compressed API responses, cache data locally so screens open offline, and show skeleton loaders and clear retry options. Defer non-critical SDK initialisation to speed up startup. Test on budget devices with 2 or 3 GB RAM and throttled networks, since many users in India use them.
34

Write a Dart sealed class for API results and handle it with an exhaustive switch.

Dart and Flutter BasicsMedium
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sealed class Result<T> {} class Success<T> extends Result<T> { Success(this.data); final T data; } class Failure<T> extends Result<T> { Failure(this.message); final String message; } Widget view(Result<List<String>> r) => switch (r) { Success(:final data) => ListView(children: [for (final s in data) Text(s)]), Failure(:final message) => Center(child: Text(message)), };
35

What is Supabase and how does it compare to Firebase?

Mobile Backend, APIs and FirebaseMedium
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Supabase is an open-source backend platform built on PostgreSQL, offering authentication, a relational database with auto-generated APIs, row level security, storage, edge functions and real-time subscriptions. Firebase uses NoSQL databases like Firestore. Supabase suits apps with relational data and SQL needs, and can be self-hosted, while Firebase has a richer mobile ecosystem including Crashlytics, Remote Config and FCM. Many apps combine them.
36

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.

Companies with offices in Bangalore (16)

E-commerce & consumer tech

Flipkart

Mobile App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad

View questions
E-commerce & consumer tech

Swiggy

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Hyderabad

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Fintech

PhonePe

Mobile App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Pune

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Fintech

Paytm

Mobile App Development interview questions

  • 30 questions
  • 5 rounds

Noida, Bengaluru, Mumbai

View questions
Fintech

CRED

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

View questions
E-commerce & consumer tech

Meesho

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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Fintech

Groww

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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

Rapido

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

View questions
E-commerce & consumer tech

BigBasket

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

View questions
E-commerce & consumer tech

MakeMyTrip

Mobile App Development interview questions

  • 30 questions
  • 5 rounds

Gurugram, Bengaluru

View questions
IT services

Infosys

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Mysuru, Pune +2

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IT services

TCS

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Mumbai, Chennai, Pune +2

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IT services

Wipro

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Hyderabad, Pune +2

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IT services

GlobalLogic

Mobile App Development interview questions

  • 30 questions
  • 4 rounds

Noida, Bengaluru, Gurugram +2

View questions

Frequently asked questions

Which companies hire Mobile App Development professionals in Bangalore?

Companies with large offices in Bangalore include Flipkart, Swiggy, PhonePe, Paytm, CRED, Meesho, Groww, Nykaa, Lenskart, Rapido. Use their company pages below to practise employer-specific sets.

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

The questions depend more on the company than the city. Bangalore's mix of employers decides the style: Product-company interviews here are usually deeper, with more scenario, design and hands-on rounds

How do I find Mobile App Development jobs in Bangalore?

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

Other cities

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