A single React Native codebase that renders through Fabric to genuine UIKit and Android View components is a different engineering proposition than a WebView wrapper or a Flutter canvas app - and that difference is exactly why teams choose it when they need native look-and-feel on iOS and Android without maintaining two separate native teams. If your product has to feel native, ship fast on both platforms, and still reach into device hardware when required, React Native is a deliberate architectural choice, not a shortcut.
What "React Native development" actually covers
Building a React Native app is not just writing JSX components and calling it done. In practice it means:
- Setting up the project correctly - deciding between the managed Expo workflow, Expo with custom native modules (config plugins), or a bare React Native CLI project, based on how much native code the app will eventually need.
- Choosing a navigation and state architecture - React Navigation vs. native stack navigators, and Redux Toolkit, Zustand, Jotai or React Query for state and server-cache management, depending on how much of the app is offline-first versus API-driven.
- Writing native modules and bridges when a plugin doesn't exist - Kotlin/Java on Android, Swift/Objective-C on iOS, exposed through TurboModules on the New Architecture or the legacy bridge on older codebases.
- Handling platform divergence deliberately - push notification setup differs between APNs and FCM, permission dialogs differ, safe-area and gesture handling differ, and a well-built app treats these as explicit decisions, not afterthoughts patched in QA.
- CI/CD for two app stores - Fastlane or EAS Build pipelines that produce signed builds, manage provisioning profiles and keystores, and push to TestFlight and Play Console internal tracks automatically.
Where React Native fits, and where it doesn't
We tell clients upfront when React Native is the wrong tool. It's a strong fit for content-driven apps, marketplaces, booking and service apps, internal enterprise tools, and MVPs that need to validate demand on both platforms quickly. It's a weaker fit for apps that are almost entirely custom animation, heavy 3D/AR, or need every frame of native-level performance tuning - those cases often justify Swift/Kotlin natively, or a hybrid approach where 90% of the app is React Native and one or two screens are native modules embedded directly.
Shared codebase, not shared compromise
The goal of a shared JavaScript/TypeScript codebase is code reuse in business logic, API calls, validation, and most UI - typically 70-90% shared depending on how platform-specific the UX needs to be. We don't force pixel-identical screens on both platforms when iOS and Android users expect different interaction patterns (bottom tab bars vs. drawer navigation, iOS-style modals vs. Android bottom sheets); we build a component library that respects `Platform.select()` and platform-specific file extensions (`.ios.tsx` / `.android.tsx`) where it genuinely matters.
Native modules and hardware integration
Most React Native projects eventually need something outside the JavaScript sandbox: Bluetooth Low Energy for connected devices, camera and ML Kit/Vision for scanning or recognition, background location tracking, biometric auth via Keychain/Keystore, or payment SDKs (Razorpay, Stripe, PayU) that ship their own native UI. We write and maintain these bridges directly rather than stacking third-party wrapper packages that go unmaintained. Where the React Native New Architecture (Fabric renderer + TurboModules + JSI) is available, we build modules against it so the app isn't stuck migrating later when Meta deprecates the old bridge entirely.
Performance work that actually moves the needle
Performance in React Native usually breaks down into a handful of concrete problems: unnecessary re-renders from unmemoized components and inline function props, JS-thread blocking during list rendering (solved with FlashList instead of the stock FlatList in most cases), image loading and caching (react-native-fast-image or the newer Expo Image), and bridge traffic when the old architecture is still in use. We profile with Flipper/React DevTools and the native Instruments/Android Profiler before touching code, rather than guessing at optimizations.
Typical deliverables
- A scoped technical architecture document covering navigation structure, state management approach, offline strategy, and third-party SDK list before development starts.
- A TypeScript codebase with a component library, API layer (typically React Query or RTK Query against REST or GraphQL), and test coverage using Jest and React Native Testing Library.
- Signed, store-ready builds for both platforms with CI/CD configured so future updates don't require manual Xcode/Android Studio steps.
- Crash and performance monitoring wired in from day one - Sentry or Firebase Crashlytics, not added after the first production incident.
- App Store and Play Store submission handling, including screenshots, privacy declarations (App Privacy details, Data Safety form) and review-rejection troubleshooting.
Backend and integration decisions
The mobile app is rarely standalone. We work with whatever backend already exists - Node.js/Express, .NET, Laravel, or a headless CMS - and where there isn't one, we scope a REST or GraphQL API alongside the app rather than treating the backend as an afterthought. Real-time features (chat, live tracking, notifications) get built on WebSockets or Firebase Realtime/Firestore depending on scale and existing infrastructure, with a clear decision on which approach avoids vendor lock-in versus which gets the feature shipped faster.
Migration and legacy app work
A meaningful share of React Native work isn't greenfield - it's upgrading an app stuck on React Native 0.63 or earlier, migrating from the old bridge to the New Architecture, replacing deprecated libraries (react-native-camera, for instance, which is no longer maintained), or debugging an app that was outsourced cheaply and now crashes intermittently in production. This work starts with a dependency audit, a New Architecture compatibility check, and a realistic estimate of what breaks versus what upgrades cleanly.
When we recommend Expo versus bare workflow
Expo's managed workflow with EAS Build has closed most of the gaps that used to force teams into bare React Native - config plugins now cover most native module needs without ejecting. We default to Expo for new projects unless there's a specific native SDK with no config plugin available, or the client's existing native codebase (for a rewrite) makes a bare project more practical.
Ongoing support after launch
React Native and its ecosystem move fast - Expo SDK releases roughly every quarter, and iOS/Android OS updates periodically break existing behavior around permissions, background tasks or notification delivery. Post-launch support in practice means dependency updates, OS-compatibility testing ahead of new iOS/Android releases, monitoring crash-free session rates, and iterating on features based on actual usage data rather than assumptions made at the design stage.
