React Native development company
From first prototype to App Store and Google Play release, we build React Native apps that share one TypeScript codebase across iOS and Android while dropping into Swift or Kotlin wherever the platform demands it.
- Senior engineers · IST + EST overlap
- NDA on day 1
- 24-hour reply
- Projects shipped
- 50+
- Code ownership
- 100%
- Client rating
- 4.8/5
- First reply
- 24h
One React Native codebase, two native apps
Krapton works as a React Native development company for teams that want one partner to build a React Native app end to end: a single TypeScript codebase for iOS and Android, released through App Store Connect and Google Play Console. React Native renders real platform views rather than a WebView, and current releases run on the New Architecture, where Fabric and TurboModules talk to native code through JSI instead of the old asynchronous bridge. For most new projects we start with Expo: Expo Router for navigation, EAS Build for signed binaries, and prebuild with config plugins to generate the ios and android folders. Teams adding React Native to an existing native app, or wanting to own and hand-edit the Xcode and Gradle projects, get a bare React Native setup instead, and both paths can still use Expo modules. React Native is the wrong pick for 3D games, where Unity or Unreal fit better, and for apps built mostly on one platform’s newest system features, where Swift or Kotlin pays off.
React Native development services
New app builds
Build a React Native app from scope to store: screen flows, Expo Router or React Navigation structure, a typed API layer with TanStack Query, offline storage and crash reporting from the first build.
Expo and EAS setup
Expo projects configured with development builds, EAS Build profiles for preview and production, EAS Submit for store uploads, and EAS Update channels so JavaScript fixes reach users without a full binary release.
Swift and Kotlin modules
When a library does not exist or falls short, we write Turbo Native Modules or Expo Modules in Swift and Kotlin for Bluetooth, payments SDKs, background tasks and camera pipelines.
New Architecture migration
Older apps moved onto Fabric and TurboModules: dependency audits against the React Native Directory, replacing abandoned libraries, upgrading through the React Native Upgrade Helper, and fixing interop issues on both platforms.
Performance tuning
Profiling with React Native DevTools and Hermes sampling profiles, moving long lists to FlashList, running gestures and animations on the UI thread with Reanimated, and trimming startup work so cold launches feel quick.
Store release management
Signing certificates, provisioning profiles, Play App Signing, privacy manifests and data safety forms handled, with TestFlight and Play internal testing tracks used before every staged production rollout.
Why teams choose Krapton for React Native
Senior engineers, fixed scope, and code you own — the things agencies promise and rarely deliver.
Expo or bare, argued honestly
We recommend the workflow from your requirements, not habit: Expo with prebuild for most products, bare React Native when brownfield integration or unusual build tooling makes generated native projects a burden.
Native skills on the team
Our React Native engineers read Swift, Objective-C, Kotlin and Java, so crashes in native code, Gradle conflicts and CocoaPods errors get fixed rather than worked around in JavaScript.
Tested on real devices
Unit tests with Jest and React Native Testing Library, end-to-end flows in Maestro or Detox, and manual passes on low-end Android phones as well as current iPhones before each release.
Release safety built in
Crash and performance monitoring through Sentry or Firebase Crashlytics, source maps uploaded per build, and OTA updates gated by channel so a bad JavaScript bundle can be rolled back quickly.
How a React Native project runs with Krapton
01
Discovery and workflow choice
We list features, native SDKs, offline needs and target OS versions, then decide Expo or bare, navigation, state management and backend contracts before any screens are built.
02
Design and prototype
Clickable designs follow iOS Human Interface Guidelines and Material Design where they differ, and a development build on real phones validates risky native features early.
03
Installable sprint builds
Every sprint ends with an installable build through TestFlight and Play internal testing, plus a demo, so stakeholders review the app on their own devices.
04
Store launch and support
We prepare listings, screenshots and review notes, answer App Review questions, release in phases, then handle OS updates, dependency upgrades and new React Native versions.
The React Native stack we build with
React Native development: questions answered
How does a React Native development company build one app for iOS and Android?
It writes the product once in TypeScript and React, and React Native renders it with each platform’s own UI components. Typically most screens, business logic and API code are shared; platform-specific extensions such as Button.ios.tsx, the Platform.select API and native modules handle the differences. Krapton still tests and tunes each platform separately, because gestures, permissions, notifications and keyboard behavior differ between iOS and Android.
Should we use Expo or a bare React Native workflow?
Choose Expo unless you have a specific reason not to; the React Native team itself recommends starting with a framework such as Expo. Expo gives you EAS Build, over-the-air updates and Expo Router, and custom native code is still possible through development builds and config plugins. A bare project fits brownfield apps that embed React Native inside existing Swift or Kotlin code, or teams that must hand-maintain Xcode and Gradle files.
What does releasing a React Native app to the App Store and Google Play involve?
It involves two separate review pipelines, each with its own signing and policy requirements. For iOS you need an Apple Developer account, certificates and provisioning profiles, a privacy manifest and App Store Connect metadata, with TestFlight for beta testers. For Android you upload an Android App Bundle signed through Play App Signing, complete the Data safety form, and test on internal or closed tracks. EAS Submit or fastlane automates the uploads.
Can you migrate our app to the React Native New Architecture?
Yes, and for older apps it is now a prerequisite for staying on supported React Native versions. The work starts with a dependency audit, because libraries that never adopted Fabric or TurboModules may need upgrading, replacing or forking. We then upgrade in steps using the Upgrade Helper, fix native build changes on both platforms, and run end-to-end tests on devices before each step ships.
How is the budget for React Native development services estimated?
The estimate is driven by scope and native complexity more than by screen count. The biggest factors are the number of custom native integrations such as Bluetooth, payments or background location, offline sync and conflict handling, backend work that must be built alongside the app, accessibility and localization requirements, and whether you need a migration from an older React Native version or from separate native apps.
Ready to build? Tell us what you have in mind.
Send a short brief and a senior engineer will reply within one business day with next steps — no sales fluff.