React NativeMobile App Development

React Native
App Development
Services

Cross-platform iOS & Android apps in TypeScript with React Native's New Architecture. Share up to 90% of code between platforms and ship OTA updates without store approval.

TypeScriptNew Architecture (JSI)Expo EASRedux ToolkitReact NavigationOTA Updates

View Our Apps

App.tsx

import React from 'react';

import { View, Text, StyleSheet } from 'react-native';

const App = () => {

return (

Hello, Kotibox!

</Text>

</View>

)

}

export default App;

npx expo start

Running on iOS + Android

Code Sharing

90%

iOS + Android

OTA Update Pushed

No store review needed

150+

RN Apps Deployed

90%

Code Shared iOS & Android

Faster Than Dual Native

OTA

Instant Updates via EAS

Why React Native?

The JavaScript Framework Trusted by Meta, Shopify & Microsoft

React Native lets you use the same JavaScript and React skills your web team already has to build real native mobile apps. Not web views, not wrappers — actual native components rendered by iOS UIKit and Android View system.

With the New Architecture (stable since RN 0.74), the old bridge bottleneck is gone. JSI enables synchronous communication between JavaScript and native modules, Fabric brings concurrent rendering, and TurboModules load lazily — delivering performance that rivals native at a fraction of the development cost.

2M+

Developers Using React Native

Ship Fixes in Minutes. No Store Review Needed.

React Native's biggest operational advantage: Expo Updates (OTA) lets you push new JavaScript bundles directly to users' devices. A critical bug fix that would take 3 to 7 days through App Store review can reach 100% of your users in under 10 minutes.

Instant Bug Fixes

A JavaScript bug discovered on Monday is fixed and deployed to all users by Monday afternoon. No 3-day store review wait.

Feature Flags & A/B Testing

Use Expo Updates channels (production, staging, preview) to test new features with a subset of users before full rollout.

Rollback in Seconds

If an OTA update causes issues, roll back to the previous bundle version instantly with a single CLI command.

Silent Background Updates

Updates download in the background while the user uses the app and apply on the next launch -- zero interruption.

Code Sharing

Write Once, Run on iOS & Android

React Native Code Sharing Breakdown

Business Logic & UtilitiesTypeScript utils, formatters, validators

100%

State Management (Redux/Zustand)Shared slices, selectors, actions

100%

API Layer (React Query)All API calls and data transforms

100%

UI Components~80% shared, ~20% platform-specific

80%

NavigationMostly shared, minor platform tweaks

90%

Native ModulesPlatform-specific (auto-linked by RN)

Total code shared~90%

What's Included

Complete React Native Development Package

Every React Native project ships to both iOS and Android with no extra cost per platform.

TypeScript Throughout

React Native New Architecture (JSI)

Expo EAS Build & Submit

OTA Updates (Expo Updates)

Redux Toolkit / Zustand

React Navigation v7

React Native Reanimated 3

NativeWind Styling

MMKV Fast Storage

Sentry Crash Monitoring

Push Notifications (FCM/APNs)

Biometric Authentication

Camera, GPS & Device APIs

Detox E2E Testing

CodePush / EAS OTA

Play Store & App Store Submit

Our Process

8-Step React Native Development Process

From JavaScript architecture to simultaneous Play Store and App Store submission.

Discovery & JavaScript Strategy

We begin by auditing your existing web/React codebase to identify how much business logic can be shared with the mobile app. We define the Expo vs bare workflow decision, plan the navigation stack (React Navigation), and scope features for the first release.

Web-to-Mobile Code AuditExpo vs Bare Workflow DecisionNavigation Architecture PlanFeature Scope & Sprint Roadmap

UI/UX Design with Platform Adaptivity

We design platform-adaptive UIs in Figma that look and feel native on both iOS and Android. Using React Native's Platform API and styled-components/NativeWind, we build components that automatically adopt platform conventions while sharing a single component tree.

Platform-Adaptive Figma DesignsiOS & Android Comparison ScreensComponent Library SpecInteractive Prototype

Architecture & New Architecture Planning

We set up the project with React Native's New Architecture (JSI + Fabric + TurboModules) for maximum performance, configure Redux Toolkit or Zustand for state management, set up React Query for server state, and establish the monorepo structure if sharing code with a web app.

New Architecture Config (Fabric/JSI)State Management BlueprintMonorepo Setup (if applicable)API & Data Layer Design

TypeScript Development with Expo EAS

Two-week sprints using TypeScript for type safety across iOS and Android. We use Expo EAS Build for cloud compilation (no local Xcode/Android Studio required for CI), deliver OTA preview builds via Expo Go or custom dev client, and run Flipper-assisted debugging sessions.

EAS Build APK/IPA per SprintOTA Preview via Expo GoTypeScript Code with TestsSprint Demo Recordings

QA, Detox E2E & Device Testing

Unit tests with Jest and React Native Testing Library, end-to-end tests with Detox on physical iOS and Android devices, and visual regression tests with Storybook. We test on a matrix of 20+ real devices including Android low-end devices to ensure performance on budget hardware.

Jest Unit Test ReportsDetox E2E Test ResultsPhysical Device Matrix ReportStorybook Component Catalogue

Security Hardening & Code Obfuscation

We implement react-native-encrypted-storage (Keychain/Keystore), SSL pinning with react-native-ssl-pinning, JavaScript bundle obfuscation with Hermes bytecode compilation, root/jailbreak detection, and comply with OWASP Mobile Top 10 across both platforms.

Encrypted Storage SetupSSL Pinning ImplementationHermes Bytecode ObfuscationOWASP Compliance Checklist

EAS Submit to Both Stores

Simultaneous Play Store and App Store submission using Expo EAS Submit. One command builds and submits to both stores. We configure phased rollouts, handle App Review queries, set up OTA update channels (production, staging, preview) via Expo Updates.

Play Store & App Store SubmissionOTA Update Channel SetupASO-Optimized Store ListingsPhased Rollout Configuration

Post-Launch OTA Updates & Support

Six months of post-launch support including OTA JavaScript bundle updates (bypassing store review for JS-only changes), React Native version upgrade management, native module compatibility patches, crash monitoring via Sentry, and feature iteration sprints.

OTA Update Management (EAS)RN Version Upgrade SupportSentry Crash MonitoringFeature Iteration Sprints

Technology Stack

The React Native Tech Ecosystem We Master

We use the official React Native New Architecture with the most battle-tested packages from the community.

Language & Core

TypeScript

Full TypeScript adoption for type-safe components, hooks, navigation, and API layers.

React Native (New Arch)

JSI + Fabric + TurboModules for synchronous JS-native communication without bridge overhead.

Hermes Engine

Facebook's optimized JS engine for React Native, delivering faster TTI and lower memory usage.

State Management

Redux Toolkit

Opinionated Redux setup with createSlice, RTK Query, and immer for predictable global state.

Zustand

Lightweight, hook-based state management for simpler apps without Redux boilerplate.

React Query / TanStack

Server state caching, background refetching, and optimistic updates for API-driven apps.

UI & Navigation

React Navigation v7

Stack, Tab, Drawer, and Bottom Sheet navigators with deep linking and typed routes.

NativeWind

Tailwind CSS utility classes in React Native, sharing design tokens with your web app.

React Native Reanimated 3

Worklet-based animations running on the UI thread for 60fps gesture-driven interactions.

Networking & Data

Axios + React Query

HTTP client with interceptors plus server-state caching, deduplication, and background sync.

MMKV

10x faster than AsyncStorage. Used for app preferences and cache via Marc Rousavy's native bridge.

WatermelonDB

High-performance local SQLite database designed for large offline-first React Native apps.

Expo & Tooling

Expo SDK + EAS Build

Managed workflow for rapid development; EAS Build for cloud native compilation without local setup.

Expo Updates (OTA)

Push JavaScript bundle updates to users instantly without App Store or Play Store review.

Flipper + Reactotron

Native debugging platform and React Native-specific dev tool for network, state, and Redux inspection.

Testing

Jest + RNTL

Unit and integration tests with React Native Testing Library, mocking native modules cleanly.

Detox

Wix's gray-box E2E testing framework running on real iOS simulators and Android emulators.

Storybook RN

Component-driven development and visual regression testing for every UI component in isolation.

Industries We Serve

React Native Apps Across Every Industry

React Native is especially powerful for teams with existing React web products looking to extend to mobile without a separate team.

E-Commerce & Retail

Share product catalog, cart logic, and checkout flow code between your React web store and mobile app.

FinTech & Payments

Biometric auth, encrypted wallets, real-time trading UIs, and payment gateway integration on both platforms.

On-Demand & Delivery

Real-time map tracking, push notifications, driver/customer apps from one JavaScript codebase.

SaaS Mobile Companion

Extend your existing React web SaaS with a mobile app sharing 70%+ of the business logic.

Social & Community

Chat, stories, notifications, and media uploading with native camera/gallery access.

EdTech & Learning

Video playback, offline content download, quizzes, and progress tracking across iOS and Android.

Healthcare & Wellness

HealthKit/Google Fit integration, appointment booking, medication reminders, and secure messaging.

Enterprise Internal Tools

Approval workflows, inventory scanning (camera), field-force dashboards with offline-first SQLite.

Key Advantages

Why Choose Kotibox for React Native?

New Architecture by Default

Every new project we start uses JSI + Fabric + TurboModules. We do not build on the old bridge architecture -- only the performance-first New Architecture that is the future of React Native.

TypeScript-First Codebase

Full TypeScript adoption across components, hooks, navigation types, API response types, and Redux slices. Strongly typed codebases have fewer runtime bugs and are far easier to maintain as the team grows.

OTA Update Strategy Included

We configure Expo Updates with production, staging, and preview channels from day one. Your team can ship JavaScript fixes to users in minutes without waiting for store review -- a capability many agencies skip setting up.

60fps Animations on Both Platforms

We use React Native Reanimated 3 worklets for all gesture-driven animations, ensuring they run on the UI thread at 60fps regardless of JavaScript thread load -- the key to a native-feeling app.

Cross-Platform Security in One Place

react-native-encrypted-storage maps to iOS Keychain and Android Keystore automatically. One implementation covers both platforms with SSL pinning, Hermes bytecode obfuscation, and OWASP compliance.

EAS Build CI/CD Included

Expo EAS Build compiles iOS and Android in the cloud -- no Mac required for your team. EAS Submit automates delivery to both stores. Every PR triggers a preview build shared with your QA team.

Resources & Tooling