Rakkay Technologies

Service

React Native mobile app development

iOS and Android applications from one React Native codebase — including the Swift and Kotlin native modules most JavaScript-only teams cannot write.

Built in
React Native · TypeScript · Swift · Kotlin
Ships to
App StoreGoogle Play

Our approach

How we build them.

  1. React Native gets you a long way on one codebase. The projects that stall are the ones that hit the edge of it: a payment terminal SDK with no JavaScript wrapper, a background location requirement the packages handle badly, a screen that drops frames because the work belongs on the native side.

  2. We write the native module rather than redesigning the feature around the limitation. That means Swift on iOS, Kotlin on Android, and a typed JavaScript interface over the top — including Turbo Modules under the New Architecture.

  3. Releases are automated from the start. Signing, store builds and staged rollout run in the pipeline, because a manual release process is where mobile projects quietly lose a week a month.

Both stores

One codebase, two app stores, no second team.

The alternative to React Native is two native codebases, two sets of engineers and two release cycles that drift apart within a quarter. We ship one codebase to both stores and drop to Swift or Kotlin only for the parts that genuinely need it.

  • Signed release builds for iOS and Android
  • Native modules where no package exists
  • Startup and frame rate profiled on real devices
  • Over-the-air updates and staged rollout

In practice

What a native module actually is.

A biometric prompt no JavaScript package exposes properly. The same pattern covers anything the JavaScript layer cannot reach — a payment terminal SDK, a background service, a platform API that shipped last month and has no wrapper yet.

Your app

JavaScript and TypeScript

Screens, state and business logic — the ninety per cent of a React Native app that never needs to leave JavaScript.

One codebase, both platforms

The platform

Swift and Kotlin

Camera pipelines, biometrics, Bluetooth, payment terminals, background services — everything the JavaScript layer cannot reach on its own.

iOSAndroid
The module in the middle is a few dozen lines of Swift or Kotlin and a typed JavaScript signature. It is the whole difference between “React Native cannot do that” and a shipped feature.

And here it is, written out.

The same module in all three of its files: the two lines of TypeScript your app calls, the Swift behind them on iOS, and the Kotlin behind them on Android. This is the whole of it — a native module is a small, ordinary piece of code, and the reason most teams do not write one is unfamiliarity rather than difficulty.

Switch between the tabs. We write these as a matter of course, review them like any other change, and hand them over documented in your repository.

// What your app calls. Two lines. import { NativeModules } from 'react-native'; const { RNBiometrics } = NativeModules; type Biometrics = {  authenticate(reason: string): Promise<boolean>;}; export async function confirmIdentity() {  return RNBiometrics.authenticate(    'Confirm it's you'  );}
JavaScript sideShared
One module, three files. The TypeScript is what your app calls; the Swift and Kotlin are the part most React Native teams stop short of. Switch between them.

What you get

Every engagement delivers this.

Written as things rather than intentions, so you can hold the list up against what arrives at the end.
  • One codebase shipped to both the App Store and Google Play
  • Native modules in Swift and Kotlin where no package exists
  • Third-party native SDK integration and bridging
  • Offline behaviour, background tasks and push notifications
  • Store submission, signing and release management
  • Over-the-air update pipeline

Included

The engineering underneath.

Not add-ons, and not quoted separately. These come with the service because a project that needs them and does not get them is a project that stalls.

  • React Native native modules

    When a project needs a platform API or a vendor SDK with no React Native package, we write the native module rather than work around it.

    • Native modules written in Swift and Kotlin
    • Vendor SDK bridging — payments, hardware, biometrics, mapping
    • Turbo Modules and the New Architecture
    • Native UI components exposed to JavaScript

  • Performance and scaling

    Profiling and fixing applications that have outgrown their original design, wherever the bottleneck sits — client, server or database.

    • React render profiling and re-render elimination
    • Bundle analysis, code splitting and lazy loading
    • Slow query and N+1 diagnosis
    • Caching strategy and read-path optimisation
    • Core Web Vitals and mobile startup time

  • CI/CD and release engineering

    Automated pipelines so shipping is routine rather than an event, including signed builds for both app stores and staged rollout.

    • GitHub Actions pipelines for build, test and deploy
    • Automated iOS and Android builds with signing
    • Preview environments for every pull request
    • Staged rollout and rollback procedure

Also from us

Not what you need?

The other two, in case this is not the one. Most products end up needing more than one — tell us the whole problem and we will say which you actually need first.

Start with a conversation.

Send us the problem, not a specification. We read every message ourselves and reply personally — and if we are not the right team for it, we will say so and usually point you to someone who is.

  • Read by an engineer
  • Answered personally
  • No sales sequence
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