Hire React Native developers for cross-platform apps that feel native

Building React Native screens is the easy part of a hiring test. Cortance puts its vetting weight on what comes after: the camera API with no maintained JavaScript wrapper, the feed that stutters on a mid-range Android phone, the Expo upgrade that breaks a native dependency a week before release. Our matching system sends you a shortlist of vetted middle and senior React Native developers instead of a folder of resumes, and a matched engineer can onboard in about 2 days.

When does one codebase stop being enough?

One codebase stops being enough when a feature needs the device more than it needs the screen. Camera and sensor access, background processing, custom rendering and native SDKs without a JavaScript wrapper all push work below the shared layer, and an engineer who has never written a native module will either stall or bolt on a workaround that breaks with the next OS release. Oleh K., a mobile engineer in our network, has crossed that line twice, writing Swift and Kotlin modules for performance-critical features in a mental health app and building a custom UI library with Skia-based rendering for client projects. AI coding assistants such as Claude Code and Codex already speed up the JavaScript layer for several of our engineers, but they cannot tell you which native API your minimum iOS version supports, so review at the native boundary stays with a senior engineer. That is why our vetting checks native fluency next to React itself.

The Expo SDK upgrade nobody plans for

A store release is not the end of the work. The next Expo SDK upgrade can leave a dependency out of step with the native build, and the fix then lives in Gradle and Xcode logs, not in JavaScript. Our engineers have managed that lifecycle on shipped apps: EAS build profiles, over-the-air updates and release channels on a social app with maps and AR, StoreKit purchase testing and App Store review compliance on subscription apps, and JavaScript-to-TypeScript migrations of codebases they inherited half finished. They have also cut unnecessary re-renders and lazy-loaded heavy screens where a long list slowed the app down. If you are handing over an app that already exists, we match on that experience first.

Stripe, StoreKit and Supabase in one app

A React Native app is rarely only a client, so we match engineers who own the seams to the backend too: NestJS or Node.js services, Supabase or Firebase for auth and real-time sync, WebSockets where a screen has to update live. Payments show why that matters. Digital subscriptions on iOS generally have to go through Apple's in-app purchase, while Stripe still covers payouts and web billing, and an app that treats them as one integration risks a rejection in App Store review. Volodymyr R. shipped both in one parenting app, with Stripe Connect payouts to healthcare providers next to StoreKit subscriptions for parents.

You can staff a full React Native team, a single senior engineer who owns that whole path, or short-term help to clear a backlog before a release. Every profile on the shortlist passes our vetting process first. Tell us whether your app is new, inherited or stuck on a native dependency, and we will shortlist from engineers who have already been there.