If you are looking for a React development company, you probably have one of two jobs. You need a new app built, or you have a React app that needs work. Our React development services cover both. We write React in TypeScript, and we write it so another developer can read it, test it and take it over later.
For the wider picture of what we build, see custom web app development.
What React is good for
React is a JavaScript library for building screens that change while people use them. Each part of a screen is a component, such as a table, a filter or a chart. When the data behind a component changes, React updates that part of the screen.
That makes React a good fit for:
- Dashboards where people filter, sort and drill into numbers
- Customer portals with logins, documents and account settings
- Booking, quoting and ordering tools with several steps
- Admin areas and internal tools that replace shared spreadsheets
For a marketing site that is mostly text and images, React is often more than you need. We usually build those in Astro. If your app needs public pages that rank in search, Next.js is often the better base. We use it to add server rendering on top of React.
How we structure a React codebase
Most React projects that go wrong get harder to change every month, until nobody wants to touch them. We set up the codebase to avoid that.
- TypeScript in strict mode, so many mistakes show up in the editor before they reach users.
- Folders grouped by feature, such as billing or reports. A new developer finds everything for one screen in one place.
- Small components with one job each. Shared pieces such as buttons, form fields and dialogs live in one component library.
- One agreed way to fetch data, handle forms, style components and show errors.
- Linting and formatting that run on every change, so the code looks the same no matter who wrote it.
- A README that explains how to run, test and deploy the app.
When you hire a React JS developer from us, this structure is part of the job.
Loading and storing data on each screen
Much of the trouble in a React app comes from data. Developers need to know where it lives, when it loads and what happens when it goes out of date. We keep a clear rule for each kind of data.
- Data from the server, such as orders or reports, goes through TanStack Query. It caches results, refreshes them when they change and handles loading and error states the same way on every screen.
- Form data stays in the form. React Hook Form manages the fields and Zod checks each value.
- The small amount of data the whole app shares, such as the signed-in user, goes in React context or a small store such as Zustand.
We keep shared app-wide state small on purpose. The less of it there is, the fewer bugs come from one screen changing data that another screen depends on.
Testing and accessibility
We write tests at two levels. Vitest and React Testing Library check that components behave the way a user expects. Playwright runs the key user flows in a real browser, such as sign-up, checkout or sending a report. The tests run on every change, before it can go live.
Accessibility is part of the build from the start. We use real buttons and form labels, make every screen work with a keyboard and check colour contrast. Our target is level AA of the Web Content Accessibility Guidelines 2.2 from the W3C. Custom widgets such as date pickers and dropdown menus are hard to make accessible from scratch, so we build them on tested libraries such as React Aria or Radix.
Rescuing or modernizing an existing React app
Maybe your app was built a few years ago and the developer has moved on. These problems are common in older React apps:
- The app was set up with Create React App, which the React team deprecated in 2025.
- It uses class components and old lifecycle methods that newer libraries support poorly.
- Its dependencies are years out of date, and some have security warnings.
- It has no tests, so every change risks breaking something else.
We start with a code review. You get a written report that ranks each problem by risk and by effort. Then we fix the problems in small steps while the app stays live. For most older apps that means a move to Vite or Next.js, a switch to TypeScript one file at a time, and tests around the screens that matter most. We only suggest a rewrite when the review shows it will cost less than fixing what is there.
Ways to work with us
A fixed-price project
This suits a new app or a large piece of work. It starts with a scoping call and a written plan split into phases. Prices are on our pricing page.
Hourly help for your developers
If you already have React developers and need more hands, you can hire a React developer from us by the hour. It costs $60 an hour, billed in 15-minute steps. We work in your repository, follow your code style and go through your usual pull request reviews. Good uses are code reviews, a feature your developers have no time for and slow screens that nobody has tracked down.
You get a written quote and no long contract. The code lives in your repository from the first day.
Many React apps also need a backend. See Node.js development, or full stack development if you want one studio to build every part. For data-heavy screens, read about dashboard development. When you are ready to talk about your app, contact us.
