Choosing a mobile app company is a test of delivery evidence, not portfolio aesthetics. Ask who writes the code, how they test on real devices and what happens after launch.
Key takeaways
- One TypeScript/React codebase can target iOS and Android, with native modules where the platform requires them.
- Ask for a named team, roles and the percentage of time they will spend on your app.
- Review a real app in the store, then ask what the team would change about it.
- Plan the store submission and first year of maintenance before you start building.
What changes with React Native + TypeScript
- One TypeScript/React codebase can target iOS and Android, with native modules where the platform requires them.
- Hermes and the New Architecture change performance and debugging behaviour; verify library compatibility.
- Over-the-air updates can ship JS changes, but they must respect store policies and native versioning.
- Performance work focuses on the JS thread, list virtualisation, image sizes and bridge/native module costs.
Build and release path for React Native + TypeScript
| Stage | What happens | What to check |
|---|---|---|
| Build | Metro bundles JavaScript; native projects are built with Xcode and Gradle | Test the release build, not only the debug build |
| Native modules | Check New Architecture support and upgrade paths | A stale module can block an OS update |
| Updates | Ship JS fixes over the air only within store policy | The installed native binary still constrains what can change |
| Store | Sign with your own Apple and Google accounts | Keep certificates and store access in your name |
What the work actually requires
- Check code ownership, repository access, signing certificates and store account ownership.
- A good company will explain trade-offs, not promise every feature for a fixed low price.
A practical plan
- Write a scorecard. Three outcomes for the first 90 days and the skills required.
- Shortlist three companies. Similar scope, platform and compliance constraints.
- Run a paid discovery. A small architecture and UX sprint is more predictive than a sales demo.
- Check references. Ask a former client what went wrong, not just what went well.
- Review the contract. IP, code access, store accounts, warranty, support and exit.
- Start with a slice. Build one workflow end-to-end before committing to the full roadmap.
Decision guide
| Area | What to check | Why it matters |
|---|---|---|
| Portfolio | Store links + outcomes | Logos are not evidence |
| Team | Named roles and availability | Who actually writes the code? |
| Process | Weekly demo, QA, release plan | Avoid black-box delivery |
| Ownership | You own code and store accounts | Never let the vendor hold the keys |
| Security | Device, data and secret handling | Mobile apps are a public attack surface |
| Exit | Documentation and handover | Plan for the relationship ending |
Platform rules to check
- Apple: privacy manifest, permission purpose strings, in-app purchase rules and review guidelines.
- Google: data safety form, permissions, target API level and Play policy.
- Both: account deletion, privacy policy, accessibility and accurate store metadata.
First-year budget for React Native + TypeScript
| Line | What it covers | When it lands |
|---|---|---|
| Discovery and design | Journey, prototype and UI system | Before build |
| App build | Screens, state, API integration and tests | Main build phase |
| Backend/admin | API, database, roles and reporting | Alongside the app |
| Integrations | Payments, push, maps, analytics | Mid-build |
| Store launch | Assets, review, signing and release | At the end |
| Maintenance | OS updates, dependencies and fixes | Every year |
Launch checklist
- A test build signed with the production key, installed on a clean device.
- Account creation, login, logout and account deletion all work.
- Push notifications, deep links and offline states have been tested.
- Privacy policy, store data disclosure and permission text match the app.
- Screenshots, description and support URL are accurate and localised where needed.
- Crash reporting and analytics are live before the first release.
Store review risks for React Native + TypeScript
| Risk | Why it happens | How to reduce it |
|---|---|---|
| Missing privacy details | SDK data use is not disclosed | Audit SDKs and complete the forms |
| Broken demo account | Reviewer cannot sign in | Provide a working test account |
| Payments rule | Digital goods bypass in-app purchase | Use the required store billing |
| Minimum functionality | The app is only a website wrapper | Add real native value |
| Misleading metadata | Screenshots or claims do not match | Show the real product |
Post-launch metrics for React Native + TypeScript
- React Native + TypeScript: crash-free sessions and the top crash groups for this release.
- Activation: the user completes the first meaningful action.
- Retention: return rate after one day, seven days and thirty days.
- Store conversion: page views to installs.
- Support contacts per hundred active users.
- Release adoption after an update.
Common mistakes
- Choosing a stack before defining the core user journey.
- Estimating by screens instead of workflows, roles and integrations.
- Leaving store submission, analytics and maintenance out of the budget.
- Testing only on a fast simulator instead of a mid-range real device.
- Treating the client as trusted for prices, roles or business rules.
Frequently asked questions
No. Compare the team, the scope and the total cost of ownership. A low quote that excludes backend, QA or store launch is not cheaper.
Not necessarily. Time-zone overlap, written communication and a clear process matter more than the office location. Test the working relationship with a paid discovery.
You should. The company can have delegated access. Keep control of the account, signing certificates and the domain/backend.
One complete user journey: sign up, perform the core action, see the result and recover from an error. That proves the stack, the process and the team.
Sources and further reading
- React Native documentation (reactnative.dev)
- React Native performance guide (reactnative.dev)
- Apple App Store Review Guidelines (developer.apple.com)
- Google Play developer policy (play.google.com)
Related reading
Planning a mobile app?
Send the user journey, the platforms and the integrations. I will help you scope a realistic first release and a maintenance budget.
How to cite this guide: Nur Hossain Repon, “React Native app development company: guide for founders”, Nhrepon Portfolio, reviewed October 2026, https://nhrepon.com/posts/react-native-app-development-company-guide-for-founders.
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