Mobile App Development Interview Questions in Indore
36 practice questions with answers for Mobile App Development interviews in Indore.
Mobile App Development jobs in Indore
Indore is one of central India's fastest-growing IT hubs, with IT-services campuses and product start-ups in its Super Corridor and IT parks. Companies here hire many freshers and value hands-on project work.
Below are 36 questions that match the mix of service, product and domain employers hiring junior mobile app developers in Indore.
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01
What is Firebase and which services do mobile apps commonly use?
Firebase is a mobile and web development platform. Commonly used services are Authentication for email, phone OTP and social logins; Cloud Firestore and Realtime Database for synced data; Cloud Storage for files; Cloud Functions for server code; Cloud Messaging for push notifications; Crashlytics for crash reports; Analytics; Remote Config for feature flags; and App Distribution for testers. FlutterFire and React Native Firebase provide SDKs.
02
A React Native list of 2000 items scrolls slowly and shows blank areas. How do you fix it?
Use FlatList or FlashList rather than ScrollView with map. Provide a stable keyExtractor, memoise row components with React.memo, avoid inline functions and heavy computation in renderItem, and use getItemLayout or fixed item sizes where possible. Tune windowSize and maxToRenderPerBatch, compress and cache images with a library like expo-image, and test a release build, since dev mode is much slower.
03
Write a Riverpod provider that fetches data asynchronously and display it in a widget.
Provider is simple and built on InheritedWidget but depends on BuildContext and can throw provider-not-found errors at runtime. Riverpod, from the same author, is compile-safe, independent of the widget tree, supports async providers and easy overrides for testing. Bloc uses events and states with streams, enforcing strict separation and traceability, popular in large teams and enterprises. Choose based on team familiarity and app complexity.
05
Why do you want to work in mobile app development?
Answer with genuine motivation and proof. For example: I enjoy building things people use every day in their pocket, and mobile gives fast feedback from real users. I started by building an attendance app for my college, published it for classmates, and improved it from their reviews. That experience of seeing ratings and usage grow made me choose mobile development as my career.
06
Deep links open the app but land on the home screen instead of the product page. How do you debug it?
Check that the link configuration maps the URL path to the right screen name, including nested navigators, and that path parameters match. Verify verified link setup on both platforms: assetlinks.json for Android and the associated domains entitlement plus the site association file for iOS. Test with adb shell am start and xcrun simctl openurl. Also handle links when the app is cold started versus already running.
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.
08
What security practices should every mobile app follow?
Use HTTPS everywhere and consider certificate pinning for high-risk apps. Store tokens only in secure storage, never log sensitive data, and keep secrets on the server. Obfuscate release builds, validate all input on the server, and protect sensitive screens from screenshots where needed. Check device integrity with platform attestation APIs for high-risk actions, and follow the OWASP Mobile Application Security Verification Standard as a checklist.
Impeller is Flutter's rendering engine that replaced Skia as the default on iOS and on modern Android devices. It precompiles a smaller set of shaders at build time instead of compiling them at runtime, which removes the shader compilation jank that first-time animations used to cause. It provides more predictable frame times. Developers rarely interact with it directly, but they should test on real devices when upgrading Flutter.
10
What are useMemo, useCallback and React.memo used for?
React.memo skips re-rendering a component when its props are shallowly equal. useCallback keeps the same function reference between renders, and useMemo caches a computed value, both only changing when dependencies change. They help when passing callbacks to memoised list items or computing expensive values. Overusing them adds complexity with little gain; the React Compiler can now apply such memoisation automatically in supported projects.
11
What is a Stream in Dart and how is it used in Flutter?
A Stream delivers a sequence of asynchronous events, such as real-time database updates, location changes or WebSocket messages. You listen with listen() or await for, and transform with map, where and debounce from packages. Single-subscription streams allow one listener; broadcast streams allow many. In Flutter, StreamBuilder rebuilds UI on each event. Always cancel subscriptions in dispose to prevent leaks.
12
What are privacy declarations required by the app stores?
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.
13
How does token-based authentication work in mobile apps?
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.
14
A Flutter animation is smooth on a flagship phone but janky on a budget phone. How do you fix it?
Profile on the budget device in profile mode. Common fixes: wrap frequently repainting areas in RepaintBoundary, avoid expensive effects like Opacity on large subtrees, clipping and shadows in scrolling lists, use AnimatedBuilder with child so static parts do not rebuild, precache images and decode them at display size, and move heavy computation to isolates. Reduce animation complexity on low-end devices if needed.
15
Integration tests pass locally but fail randomly in CI. How do you make them reliable?
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.
16
Tell me about a time you had to learn a new framework under a deadline.
Situation: my team decided to build a client app in Flutter, and I had only React Native experience. Task: deliver the login and dashboard screens in three weeks. Action: I completed the official codelabs in the first week, mapped concepts I knew like components and hooks to widgets and state, and asked for early code reviews. Result: the screens shipped on time, and I later wrote a short guide for other React Native developers moving to Flutter.
17
What is Supabase and how does it compare to Firebase?
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.
createState creates the State. initState runs once for setup like controllers and subscriptions; do not use inherited widgets there. didChangeDependencies runs after initState and when inherited data changes. build runs on every rebuild. didUpdateWidget runs when the parent rebuilds with new configuration. dispose runs when removed permanently, where you cancel streams, dispose controllers and timers to avoid memory leaks.
19
How does the keyboard affect layouts in React Native and how do you handle it?
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.
20
How do you handle app-wide theming and dark mode in Flutter?
Define ThemeData for light and dark modes in MaterialApp, using ColorScheme.fromSeed to generate consistent Material 3 colours, and set themeMode from a settings state, saved in shared preferences. Widgets read Theme.of(context).colorScheme and textTheme instead of hardcoded colours. Add ThemeExtension classes for brand-specific tokens. This keeps the design consistent and makes switching themes a single state change.
21
After a release, crash reports show a spike only on one Android OS version. What steps do you take?
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.
22
How do you implement authentication flow screens in React Navigation?
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.
23
The cart total shows stale values on the checkout screen after items are removed on the cart screen. How do you fix it?
Each screen probably holds its own copy of cart data. Move cart state into a single shared state object, such as a Riverpod notifier or a Cubit provided above both screens, and have both screens watch it. All mutations go through that object, which emits a new immutable state. Derived values like total should be computed from the state, not stored separately, so they can never become inconsistent.
24
The JS bundle grew large and startup is slow. How do you reduce startup time in React Native?
Measure time to interactive on a release build first. Make sure Hermes is enabled, remove unused dependencies and heavy libraries like full date or icon packs, and lazy-load screens and modules with inline requires. Defer non-critical SDK initialisation until after the first screen. Keep the initial screen light, avoid large synchronous storage reads at startup, and use the New Architecture for faster native module loading.
useState stores local state and returns the value and a setter; calling the setter re-renders the component. useEffect runs side effects after render, like fetching data or subscribing to events, with a dependency array controlling when it re-runs, and a returned cleanup function to unsubscribe. Missing dependencies cause stale values, while unstable dependencies cause loops. For data fetching, libraries like TanStack Query are usually better than raw useEffect.
26
The client wants the app to look exactly like iOS on iPhones and like Material on Android. How do you approach this in a cross-platform app?
Identify which elements truly need platform-specific behaviour: navigation transitions, back gestures, date pickers, switches and dialogs. In Flutter, use adaptive constructors like Switch.adaptive or Cupertino widgets based on Theme.of(context).platform. In React Native, many components are native already, and Platform.select handles differences. Keep shared business logic and most layout common, and limit platform branches to a component library so they stay manageable.
27
How does navigation work in React Native with React Navigation?
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.
28
What is an Expo project and how does it differ from a bare React Native project?
Expo is a framework and toolset for React Native that provides prebuilt native modules, file-based routing with Expo Router, EAS cloud builds and over-the-air updates. With Continuous Native Generation, Expo creates the android and ios folders from app config and config plugins, so you rarely edit native code. A bare project manages native folders directly. Expo is now the officially recommended way to start React Native apps.
29
How do you persist state in React Native between app launches?
For small key-value data use AsyncStorage or MMKV, which is much faster and synchronous. Persist Redux with redux-persist or Zustand with its persist middleware, choosing only the slices that need it. Store tokens in secure storage like expo-secure-store or Keychain and Keystore wrappers, never in plain storage. For larger structured data use SQLite through expo-sqlite or an ORM like WatermelonDB.
30
Why use TanStack Query for server state in mobile apps?
Server state, such as data fetched from APIs, has caching, refetching, staleness and retry concerns that client state libraries do not handle well. TanStack Query caches responses by query keys, deduplicates requests, refetches on focus or reconnect, supports pagination and infinite queries, optimistic updates and offline persistence. It removes large amounts of useEffect and loading-state code and keeps screens consistent.
31
How do you make sure your code works before handing it to QA?
I test the happy path and edge cases myself on both Android and iOS, including no network, slow network, empty states, large text sizes and rotation. I write unit tests for logic and run the existing test suite. I review my own diff before raising the pull request and add clear testing notes for QA explaining what changed and what to check, which saves time for both of us.
32
A security audit finds that the app stores the access token in plain shared preferences. How do you fix it?
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.
33
How would you plan a staged rollout for a major redesign?
Release to internal testers and beta users first and collect feedback. Then roll out to 5 percent of production users, monitoring crash-free rate, ANRs, key conversion metrics and reviews for a few days, before moving to 20, 50 and 100 percent. Keep the redesign behind a remote flag to switch back without a release. Define rollback criteria in advance and communicate the plan to support teams.
34
Write a React Native component that requests location permission and shows the coordinates using Expo.
Use Jest as the test runner with React Native Testing Library, which renders components and queries them the way users do, by text, role or label. Fire events like fireEvent.press or userEvent, then assert on output. Mock native modules and network calls with jest mocks or MSW. For end-to-end tests on real builds, use Detox or Maestro, which drive the app on emulators and simulators.
36
Describe a time you had to deliver a feature with incomplete requirements.
Situation: product asked for a referral feature with only a one-line description. Task: deliver in a sprint. Action: I listed open questions, met the product manager for 20 minutes to agree on core rules, built the agreed version with configurable reward values from the backend, and documented assumptions in the ticket. Result: we shipped on time, and later changes needed only config updates instead of a new release.
Few big employers listed in Indore?
Many Indore candidates also apply to teams in Pune and to remote or hybrid roles. Practise the Pune set as well.
Which companies hire Mobile App Development professionals in Indore?
Companies with large offices in Indore include many IT services and product firms. Use their company pages below to practise employer-specific sets.
Are Mobile App Development interviews in Indore different from other cities?
The questions depend more on the company than the city. Indore's mix of employers decides the style: Companies here hire many freshers and value hands-on project work
How do I find Mobile App Development jobs in Indore?
Shortlist companies with Indore offices, keep your CV focused on Mobile App Development projects, apply on company career pages and job portals with the Indore filter, and practise the questions on this page before each interview.