React Native Development Company | iOS & Android in TypeScript

ClickMasters builds production-grade React Native applications using the New Architecture JSI, Fabric renderer, and TurboModules for B2B companies across the USA, Europe, Canada, and Australia. TypeScript throughout. Zustand for state. WatermelonDB for offline data. Detox for E2E. EAS Build for CI/CD that produces iOS builds without a macOS runner. Both stores from one TypeScript codebase.

React Native's reputation for performance issues was largely earned by the Legacy Architecture a design where JavaScript and native code communicated via an asynchronous JSON bridge. Every time the JavaScript thread needed to call a native API (access the camera, update a view, call a sensor), it serialised the call to JSON, sent it across the bridge, waited for a response, and deserialised the result. This bridge was the performance bottleneck responsible for frame drops on complex animations and sluggish native module calls. The New Architecture, shipped in stable form in React Native 0.71 (2023) and made the default in React Native 0.76 (2024), eliminates the bridge entirely with three components: JSI (JavaScript Interface a direct C++ interface between JavaScript and native code, enabling synchronous calls without serialisation), Fabric (the new React Native UI renderer replaces the legacy UI Manager with a C++ component that renders synchronously and correctly handles concurrent React features), and TurboModules (lazy-loaded native modules that load only when first called, reducing startup time). The result is React Native that performs significantly closer to native than the legacy architecture and is compatible with React 18's concurrent features (Suspense, transitions, automatic batching).

The New Architecture is default in React Native 0.76+. If an agency's React Native work uses the legacy bridge architecture (you can identify this from their stack descriptions AsyncStorage as the primary storage, no mention of JSI or TurboModules, no EAS Build), they are building on deprecated patterns. ClickMasters builds all new React Native projects on the New Architecture and can migrate legacy codebases to the New Architecture as part of a modernisation engagement.

Expo is the most popular toolchain for React Native development. Understanding the two Expo approaches is important for buyers evaluating React Native.

React Native is an open-source framework developed by Meta (Facebook) for building native iOS and Android mobile applications using JavaScript and TypeScript, with the React component model. Unlike hybrid web apps wrapped in a WebView, React Native renders using actual native platform UI components iOS UIKit components on iOS, Android Material components on Android via a bridge (Legacy Architecture) or directly via JSI (New Architecture). The result is apps that look, feel, and perform like native apps while sharing a single JavaScript/TypeScript codebase across both platforms. React Native is used in production by Meta, Instagram, Discord, Shopify, and Microsoft. Its primary advantage over Flutter is language familiarity any React web developer can contribute to a React Native project with minimal ramp-up.

State management is the most commonly debated React Native architecture decision. The answer has become clearer as the ecosystem has matured.

Expo Application Services (EAS) Build is one of the most valuable tooling improvements in the React Native ecosystem it enables building iOS apps in the cloud without requiring a macOS machine for every developer. EAS Build handles certificate and provisioning profile management automatically (no Fastlane match required), builds both iOS (.ipa) and Android (.apk/.aab) on cloud infrastructure, and distributes directly to TestFlight and Play Store internal testing. GitHub Actions trigger EAS builds on merge to main a complete CI/CD pipeline without a self-hosted macOS runner.