When React Native wins certain builds
Your engineering team already writes React on the web. Hooks, patterns, types, tooling all carry across. A developer switching from a Next.js codebase is productive on day one. A Flutter engineer, however strong, is not - they have a new language, new state libraries, new test runner, new debugger to learn. That is the single biggest reason we pick RN over Flutter for a team that is already JavaScript-native.
The other reason is OTA. Expo Updates and CodePush let you ship a JavaScript fix in under an hour. Flutter has no first-class equivalent. For fintech, live commerce, or any app where a broken copy change blocks revenue for three days on Apple’s review queue, that difference matters.
When to pick something else
- iOS-only with a small team - native Swift and SwiftUI ships faster.
- 120Hz animation-heavy UI - Flutter’s Impeller is closer to native than React Native yet.
- AR or 3D experience - use ARKit or SceneKit on iOS, ARCore on Android.
- Team of two web engineers, one designer, 14 weeks to iOS and Android - React Native is the honest answer.
We tell you which one you are before we quote the job.
Our React Native capabilities
- New Architecture (JSI, Fabric, TurboModules) on new builds. Synchronous calls across the bridge, no serialization tax on hot paths.
- Expo managed + bare workflows - managed first, bare when native code is unavoidable.
- Native module bridging - we write Swift and Kotlin when a library does not exist or is broken. Fork, patch, vendor, cut an upstream PR.
- Shared logic with React web - hooks, types, validation, API clients shared across mobile and web.
- OTA deployment - EAS Update or CodePush. Version-gated, channel-targeted, Sentry-watched.
- Hermes tuning - smaller bundles, faster startup, predictable memory.
- Reanimated 3 for anything gesture-driven. UI thread, not JS thread.
- FlashList over FlatList for lists over 50 items.
- Type-safe backend contracts - OpenAPI generated TypeScript clients from FastAPI or Pydantic.
Case studies
- Cross-border airtime and prepaid electricity top-ups in 5 seconds - React Native consumer app, React web + reseller dashboard, shared FastAPI backend. 130+ operators in 44 countries via DT One aggregator. Webhook-driven order state machine hits a ~5-second top-up SLA. Multi-gateway payments (Stripe, PayPal) settled into one ledger.
- Live auction bidding without the timer drifting - React Native buyer app, React operator console, FastAPI REST + WebSocket backend. Server-authoritative 30-second countdown, atomic bids with seen-current-highest conflict check, OneSignal for auction-start alerts, AWS S3 for vehicle galleries.
How we work on a React Native engagement
Week 1 - architecture. Screen list, navigation graph, API contract, state boundaries. Expo managed vs bare decision, OTA strategy, crash-report SDK picked. Written down before any JSX.
Weeks 2 to 3 - the spine. Auth, first real data fetch, first navigation, first animation. TestFlight build by Friday of week 2. If it does not run on a real iPhone and a real Android device by then, we regroup.
Weeks 4 to 10 - features, one per week. Demoed on real hardware, not a simulator. Flamegraphs cut before merge when we touch a hot path.
Weeks 11 to 12 - polish and release. Accessibility, dark mode, analytics, crash reporting, App Store and Play Store staged rollouts.
OTA updates - the operational lever most agencies underprice
OTA is not a party trick. On the apps where it matters, it changes operations:
- Fix a broken copy change in 30 minutes, not 3 days.
- Turn off a feature flag from EAS without a redeploy.
- Roll out a new pricing page to 10% of users, measure conversion, push to 100%.
Getting OTA right needs discipline: version gates (do not push JS that requires a native change), rollback runbooks, and Sentry watching every update. We ship OTA as standard, not as a nice-to-have.
Native modules - what happens when a library breaks
Every React Native project hits a moment when a dependency is broken. BLE stops advertising on Android 14. A camera library leaks memory on older iPhones. Expo’s Bluetooth plugin misses a permission on iOS 17.
We fork, patch, vendor, and cut the upstream PR. The project never stops. The patch lives in the repo with a note explaining why - so the next engineer knows.
Backend coupling - typed end to end
React Native apps we build talk to a FastAPI backend. Request and response schemas are Pydantic on the server, mirrored as TypeScript on the client via a shared OpenAPI spec. The “backend sent a field the app did not expect” class of bug disappears. See Backend Development.
Hermes, Reanimated, Fabric - the tuning we do by default
- Hermes on from day one. Smaller bundles, faster cold starts.
- Reanimated 3 for anything gesture-driven. UI thread so scrolling does not stall behind JavaScript.
- Fabric / TurboModules for new builds. Synchronous calls across the bridge, no serialization tax on hot paths.
- FlashList over FlatList for anything over 50 items. Lower memory, fewer re-renders.
Why teams pick our React Native delivery
If your engineering team already lives in React and TypeScript, the ramp-up we need is short. Hooks, types, and patterns move across the web and the mobile app on day one instead of day ninety.
OTA is in by default: version gates, Sentry watching, rollback runbook in the repo. We have been shipping JavaScript fixes in under an hour across clients for five years without App Store pushback. And when a library is broken (it will be - that is RN), we fork and patch in your repo. Waiting on a maintainer is not a plan.
Senior engineers on the product, full IP transfer at launch (source, CI, infrastructure, all yours), and the option for us to stay on retainer after go-live if you want that.