Reusable components
The interface is built from components that speed up subsequent releases and keep the application consistent.
Expertise · React
React.js Development: Custom Interfaces Built to Last
Etixio delivers custom React.js development for your web interfaces: business applications, portals and SaaS products built to evolve. We build new products, take over and modernize existing front-ends, and add AI features to them, from conversational assistants to streamed responses.
Understanding the technology
React in your project.
React is a library for building interfaces out of components. It lets you describe what is displayed and how it changes, while how data, navigation and service calls are organized remains a project decision. We use it for business interfaces and web products that need to evolve.
The benefits for your product
Why choose React.js?
React.js is one of the most widely used front-end libraries, backed by an active open source community. It is well suited to interactive web applications, single-page applications, e-commerce platforms and, with React Native, mobile apps.
Smooth interfaces
Rendering only updates what changes, which keeps screens responsive even in feature-rich interfaces.
SEO with Next.js
Paired with Next.js, React benefits from server-side or static rendering for indexing and load speed.
Web and mobile
React Native shares React’s concepts and part of its code for iOS and Android apps.
Easier maintenance
A component-based architecture and typed code make the product easier to evolve and easier for another team to take over.
Our scope of work
The work we take on.
Components
Define a library of consistent elements, with their states and interactions.
State & data
Organize forms, navigation and exchanges with application services.
Experience
Check accessibility, performance and real user journeys beyond the initial render.
What we build
The projects we build with React.js.
Web and SaaS applications
Dashboards, business tools and interactive platforms connected to your Node.js, PHP, Java or .NET back-ends.
E-commerce and marketplaces
Fast front-ends and integrations with catalog, payment and management services.
Mobile apps
A shared codebase for iOS and Android with React Native.
SPAs and PWAs
Single-page applications and installable web apps for smooth user journeys.
Rebuilding an existing front-end
Gradual migration to React, screen by screen, without a full rewrite.
Our React.js expertise
The React ecosystem we master.
Frameworks
React with TypeScript, Next.js for server-side rendering, React Native for mobile.
State management
Context, Zustand or Redux Toolkit depending on complexity, plus dedicated libraries for server data.
Testing
Jest or Vitest for unit tests, Testing Library for components, Cypress or Playwright for end-to-end journeys.
Integration & deployment
GitHub Actions or GitLab CI, Docker, Vercel or Netlify depending on the chosen hosting.
Front-end security also needs work, from dependencies to how displayed content is handled. See our article on securing a React application.
React and AI
React interfaces for your AI features.
An assistant built into a product is judged first by its interface: responses streamed as they are generated, the ability to interrupt them, cited sources, recovery after an error, confirmation before an action. We build these conversational components in React, along with the services that call the models, with the right user permissions and logs.
We also take prototypes and bring them to production. See our AI agents and chatbots and our UX/UI for web and SaaS applications offering.
In the field
From technology to real-world use.
On an affiliate platform, the same piece of information can appear in a list, a detail view and a form. We organize how it is updated to keep these screens consistent and make errors visible. React is part of Gorilla’s technical scope, where web journeys work alongside services and a mobile app.
The choices that matter
The choices to examine before building.
The number of components is not a measure of quality. We decide what deserves to be shared, where state should live and how to test a complete journey. Accessibility, performance and slow-connection cases are checked on the real interface, not just in a component library.
From work to deliverables
Delivery your team can take over.
The scope of work specifies the components to build or take over and the acceptance criteria. We work in short sprints with regular demos, under the responsibility of a tech lead. We provide what is needed to understand the changes, verify them and continue the work.
- Documented components and states
- Interfaces connected to APIs
- Tests of user journeys
Frequently asked questions
React.js development: your questions.
What is React.js and why use it?
React.js is a front-end library created by Meta for building dynamic web interfaces. Its architecture of reusable components speeds up development and makes maintenance easier. It is now a common choice for applications with high user experience requirements.
What is the difference between React.js and React Native?
React.js is used to build web applications; React Native is used for iOS and Android mobile apps. Both share the same concepts, which lets you pool skills and part of the code.
Is React.js good for SEO?
Yes, with a framework like Next.js. Server-side or static rendering improves indexing and reduces load time. A React application rendered only in the browser is less favorable for SEO.
Can an existing application be migrated to React.js?
Yes, gradually. The migration can be done screen by screen, without a full rewrite, to limit risk while improving performance, experience and maintainability.
How long does a React.js project take?
It depends on the scope: an MVP can be delivered in a few weeks, while a complete product spans several months with regular releases. A scoping phase sets a realistic initial scope.
How much does React.js development cost?
It depends on the functional scope, the complexity and the engagement model. Precise scoping lets you adjust the budget from the start; our pricing page gives ballpark figures.
Can an AI assistant be added to an existing React interface?
Yes. The assistant becomes a component of the interface, connected to a server-side service that calls the model with the user’s permissions. We handle the streaming, errors, logs and evaluations needed for production.
Why entrust your React project to an offshore team?
Our French-speaking engineers in Madagascar and Mauritius, with a 1 to 3-hour time difference from Paris, work in your tools and rituals, supervised by a tech lead. A dedicated team evolves your product over the long term; a fixed-price project suits a defined scope.
Let’s talk about your technical context.
Tell us about the application, the issue to address and the known constraints. We will review the dependencies and the initial scope of work with your team.