As a leading provider of custom mobile app development solutions, we've had our fair share of experiences with React Native. With its promise to write one codebase and run it on both iOS and Android, React Native has revolutionized the way developers approach cross-platform app development. In this article, we'll dive into the top 10 principles that have helped us deliver nurse-scheduling platforms, fintech apps, and high-traffic marketplaces with React Native.

Audit Every Outside Library Before Installation

When it comes to React Native, it's tempting to install a package for every feature you need. However, it's crucial to remember that if the package stops updating, your app will stop updating too. Our rule is simple: conduct a quick three-point check before installing any library:

  • Check the package's update frequency
  • Review the package's documentation and community support
  • Test the package thoroughly

If the library fails these tests, we either fork it or find an alternative to ensure our roadmap stays on track.

Upgrade Little and Often

Upgrading React Native can be a daunting task, especially when you're dealing with multiple versions at once. Our strategy is to upgrade with every second release, following the official "Upgrade Helper" checklist, and running automated smoke tests to catch any issues early on.

Keep at Least One "Native" Expert on the Team

While React Native provides an impressive 90% of a typical feature set in JavaScript, there are still some features that require native expertise. This includes push notifications, in-app purchases, and Bluetooth connectivity. Having a single developer who can open Xcode eliminates most "Why won't this build?" surprises.

Move Heavy Lifting Off the Main Thread

Mobile screens refresh at an incredible 60 times per second. Any calculation that runs longer than 16 ms causes visible stutter. To avoid this issue, we shift big tasks like data crunching and complex animations to either the new JavaScript Interface (JSI) or tiny native modules.

TypeScript Everywhere

TypeScript adds static typing to JavaScript, which not only catches bugs before the code even runs but also makes onboarding new developers faster. With field names and expected data shapes self-documented, you'll enjoy less QA time and happier budgets.

Treat Navigation and State as First-Class Citizens

Non-developers often feel navigation pain as "Why did the screen flicker?" or "Why did I lose my form data?" To prevent these issues, we segment navigation logic into its own service layer and use one predictable state tool (usually Zustand or Redux Toolkit).

Automate Certificates and Store Uploads

iOS distribution is still paperwork-heavy – profiles, certificates, TestFlight builds. We rely on Fastlane or Expo's cloud builder to generate those files, sign the app, and push it to Apple. This means release day requires one command, not ten manual steps.

Budget for Bundle Size

React Native carries a small overhead: the JavaScript engine travels with your app. We slim down our builds by compressing images, code splitting, and accepting that a React Native build is often 5–10 MB larger than its pure-native twin.

Test on Real Low-End Phones

Simulators run on laptops that are faster than your users' devices. We keep a "device farm" of older phones to catch performance dips early. If the app stays smooth there, flagship devices are a given.

Reserve 10% of Every Sprint for Maintenance

Dependencies update, Apple deprecates APIs, and Google changes Play-Store policies. We carve out maintenance as an explicit backlog item – never a leftover. Regular housekeeping keeps technical debt from compounding into costly rewrites.

By following these React Native best practices, you'll be able to deliver fast and user-friendly cross-platform apps that meet the needs of your users. Remember, with great power comes great responsibility – stay disciplined, and your app will thrive!

Not sure if React Native is the right fit for your fitness app development project? Drop me a message. We're happy to share what's worked (and what hasn't) across multiple industries and use cases.