React JS Development Services

We build new web applications with React 19 and TypeScript, using Vite or Next.js depending on how the product needs to render, scale, and serve users. During the first sprint, we define component boundaries, routing, API contracts, state management, error handling, testing strategy, and performance budgets instead of allowing these decisions to emerge inconsistently over time. Typical work include:

• SaaS platforms
• customer portals
• internal business systems
• marketplaces
• dashboards
• data-heavy applications
• enterprise web interfaces
• customer-facing digital products

We also establish reusable components and shared frontend conventions so additional developers can extend the application without introducing unnecessary architectural drift.

We build production applications with Next.js and the App Router, selecting the rendering strategy according to the requirements of each part of the product rather than forcing the entire application into one model. We use:

• Static Site Generation (SSG) for marketing, documentation, and content pages that benefit from pre-rendering
• Server-Side Rendering (SSR) for personalized, frequently updated, or request-dependent content
• React Server Components to move suitable rendering and data-fetching work to the server and reduce unnecessary client-side JavaScript

The same application can combine these approaches where different routes have different performance, SEO, or interactivity requirements.

Our Next.js work also covers:

• metadata and canonical configuration
• XML sitemaps
• structured data
• image optimization
• font optimization
• caching strategies
• route-level loading and error states
• authentication
• API and backend integration
• server actions where appropriate
• monitoring and performance measurement

We can deploy to Vercel, AWS, or client-controlled infrastructure, depending on security, scalability, and operational requirements.

We build and modernize data-heavy React applications around the data-loading and mutation patterns now available through React Router 7. This architecture can be a strong fit for applications with forms, nested routes, server-driven data flows, and transactional workflows where adding large amounts of client-side state would create unnecessary complexity. We implement:

• route loaders
• actions and form mutations
• nested routing
• progressive enhancement
• server-side data loading
• error boundaries
• pending and optimistic UI states
• authentication and authorization flows

For existing products, we can also migrate Remix v2 applications to React Router 7, reviewing routes, data APIs, deployment configuration, and framework-specific dependencies as part of the upgrade.

We migrate Angular applications to React when the existing frontend architecture, upgrade burden, talent availability, ecosystem requirements, or long-term roadmap makes React a better fit. Rather than rebuilding the entire application in one high-risk release, we can migrate it incrementally. A typical phased approach includes:

• auditing the Angular architecture and dependencies
• defining React application boundaries
• creating a shared application shell
• moving individual routes or feature areas
• rebuilding shared components
• preserving backend APIs
• running Angular and React functionality in parallel where required
• removing legacy modules only after replacement functionality is validated

This keeps the product operational throughout the migration and lets the business continue releasing features while modernization is underway.

We migrate Vue applications to React when teams need stronger alignment with the React ecosystem, Next.js, React Native skills, or an existing React engineering organization. The migration can proceed feature by feature instead of requiring a complete rewrite. We review the current Vue architecture, state management, routing, component library, API layer, and build tooling, then establish equivalent React patterns before moving individual areas. Where practical, both frameworks can coexist temporarily so production releases continue during the transition.

We modernize applications built around jQuery, server-rendered pages with heavy JavaScript, or tightly coupled legacy frontend code without requiring an immediate rewrite of the entire system. React components can first be embedded inside existing pages and used to replace the highest-maintenance or most interactive areas. As each feature is migrated, we can:

• introduce TypeScript
• separate UI logic from DOM manipulation
• establish reusable components
• improve API boundaries
• add automated tests
• remove duplicated event handling
• gradually retire legacy JavaScript

This approach lets teams modernize incrementally while preserving the stable parts of the existing application.

Create React App is deprecated, and many older React applications also rely on outdated Webpack configurations, unsupported dependencies, or build pipelines that have become increasingly difficult to maintain. We migrate CRA and legacy React projects to Vite or Next.js, depending on whether the application should remain a client-rendered SPA or adopt server-rendered capabilities. The work includes:

• removing CRA dependencies
• replacing custom Webpack configuration
• migrating environment variables
• updating asset handling
• rebuilding proxy and development-server configuration
• updating testing tools
• reviewing third-party packages
• configuring CI/CD for the new build
• measuring bundle size before and after migration

We can combine the build migration with upgrades from React 16–18 to React 19, resolving deprecated APIs, library compatibility issues, and legacy application patterns in the same modernization program.

We audit existing React applications when performance problems, technical debt, slow development, or architectural inconsistency begin affecting delivery. The review covers:

• rendering behavior
• unnecessary re-renders
• client and server state management
• component architecture
• routing
• API usage
• bundle size
• code splitting
• lazy loading
• caching
• Core Web Vitals
• dependency health
• TypeScript usage
• test coverage
• accessibility
• build and deployment configuration

We then provide a prioritized list of findings, separating urgent production risks from longer-term modernization opportunities. As a result, you get: an architecture assessment, performance findings, technical debt map, prioritized remediation plan, and effort estimate for the recommended changes.

Use React consulting when you need the architecture decisions before you need a full delivery team. We assess the product requirements, existing stack, expected scale, SEO requirements, team structure, and operational constraints, then provide a written technical recommendation. Typical decisions include:

• SPA vs Next.js
• client rendering vs SSR or SSG
• whether React Server Components make sense
• Vite vs Next.js
• TanStack Query vs custom server-state handling
• Context vs Zustand vs Redux Toolkit
• monolith vs modular frontend architecture
• component-library strategy
• testing approach
• migration strategy
• deployment architecture
• team composition

The result is a documented technical direction, implementation roadmap, and effort estimate that your internal team or Devox engineers can execute against.