A React Native developer keeps one TypeScript codebase fast on iOS and Android

No. Most screens stay in TypeScript, but anything the operating system offers only natively, such as a device SDK, a home-screen widget or a background task, needs Swift or Kotlin, and writing it is part of the job. When a native part grows large, an iOS or Android specialist joins for that part rather than the whole app.

Partly. JavaScript and asset fixes can go out over the air within both stores' rules: Apple accepts downloaded scripts that do not change the app's primary purpose, and Google Play allows interpreted code while barring apps that update themselves any other way. So fixes ship as updates, while native code, permission changes and new features wait for a store release.

Budget Android phones have slower processors and less memory than recent iPhones, so costs hidden on the team's phones show there first: lists that render every row, animations waiting on the JavaScript thread, photos decoded at full size. The developer profiles a release build on such a phone and removes those causes one at a time.

Only with what React on the web never needed. A React Native developer can say what runs on the JavaScript thread and what runs natively, has written or debugged a native module, and has profiled an app on a real phone. A web developer will describe components well and stop there. The profiles we send say which native work each developer has done.

Usually. React Native's documentation recommends a framework such as Expo for new apps, and development builds with config plugins cover custom native code. The developer commits hand-edited native folders only for a change no config plugin can make, and records why, so the next upgrade does not undo it.

When most of the app's value sits in what the operating system does natively: heavy camera or audio processing, augmented reality, or several extensions such as widgets, watch apps and keyboards. Two native apps then cost less to keep fast. It can also be wrong when you already run two strong native teams. If that is your case, we will say so before sending React Native profiles.

Both ship one codebase to iOS and Android. React Native suits a team that already writes React and TypeScript, because screens, types and API clients can be shared with the web. Flutter uses Dart and draws its own interface instead of using native components. This page is about React Native; if your app is in Flutter, say so and the profiles change.

Yes. React Native can be embedded in an existing iOS or Android app, so one flow at a time moves into shared code while the rest stays native and both apps keep shipping. The developer starts with a self-contained flow, such as settings or onboarding, and agrees with your native developers how navigation and data pass between the two sides.

Yes. Many clients start with one senior engineer to cover a specific capability or capacity gap, then add specialists only when the roadmap requires them.

Yes. Adding an engineer follows the same route as the first, and you interview them. Reducing the team follows the notice period agreed in the contract, and the work is handed over in your repository before anyone leaves.

Yes. You manage priorities and day-to-day work directly, in your own channels and delivery process.

Yes. You interview every candidate using your own process and make the final decision about who joins the team.

Our engineers are ImproveIT employees and long-term contractors working through our teams in Poland and Ukraine. We are not a freelance marketplace and do not resell developers from other vendors.

Replacement terms are defined in the contract upfront, so it does not become a negotiation.

You do. IP assignment is included in the contract, and we can sign an NDA before discussing the project.

We sign an NDA before discussing the project, and confidentiality and IP assignment are part of the contract. Engineers work in your repositories, cloud accounts and tools with the access your team grants, so you can narrow or revoke it at any time.

Yes. Our engineers work with teams across Europe and the US. We agree the required working-hour overlap before matching candidates.

Our developers work in English with international product and engineering teams every day. English level is included in the candidate information you receive before the interview.

Rates depend on the role, seniority, experience, and engagement model. You receive the rate, availability, and candidate profile in writing before making any commitment.

Both are agreed before the engagement starts and included in the proposal and contract. We are flexible in that and usually agree on the terms suitable for a client.