Seattle Software Agency SeattleSoftware Agency

React & Next.js Development

Production-grade React applications built with TypeScript, tested thoroughly, and designed to scale with your product.

React has become the default choice for building complex user interfaces, and for good reason — its component model, ecosystem, and developer tooling are unmatched. But there is a significant gap between a React tutorial and a production React application that serves thousands of users reliably.

We build React applications that go beyond the basics. We use TypeScript for type safety, implement proper state management architectures, write comprehensive tests, and optimize for performance from the start. Whether you need a customer-facing SaaS dashboard, an internal tool, or a complex data visualization platform, we build it to last.

We work closely with product teams to deliver React frontends that are fast, accessible, and maintainable long after the initial build is complete.

What You Get

⚛️

Component Architecture

Modular, reusable component libraries built with TypeScript, Storybook documentation, and consistent patterns that make your codebase easy to extend.

🚀

Next.js Applications

Server-side rendering, static generation, API routes, and edge functions — leveraging the full Next.js platform for performance and SEO.

🎨

Design System Implementation

Translating Figma designs into pixel-perfect, responsive components using Tailwind CSS or styled-components with proper design token management.

📊

Data-Heavy Interfaces

Tables with virtualization, real-time dashboards, complex forms with validation, and interactive charts built with libraries like Recharts or D3.

Accessibility (WCAG 2.1)

Keyboard navigation, screen reader support, proper ARIA attributes, and color contrast — accessibility is built in, not retrofitted.

🧪

Comprehensive Testing

Unit tests with Vitest, component tests with Testing Library, integration tests with Playwright, and visual regression tests with Chromatic.

Why We Choose React and TypeScript

We build every React project with TypeScript. The upfront investment in type definitions pays for itself within weeks — catching bugs at compile time, enabling fearless refactoring, and providing documentation that stays accurate because the compiler enforces it.

For most projects, we use Next.js as the React framework. It handles routing, server-side rendering, API endpoints, and deployment without requiring you to assemble a custom toolchain. The App Router with React Server Components lets us move data fetching to the server, reducing client-side JavaScript and improving performance.

When Next.js is not the right fit — for example, embedded applications or micro-frontends — we use Vite with React Router and a lean custom setup tailored to the specific requirements.

State Management Done Right

State management is where many React projects go wrong. Teams reach for Redux out of habit, stuff everything into global state, and end up with a tangled mess of actions and reducers that nobody can follow. We take a more measured approach.

We use React Query (TanStack Query) for server state — API data, caching, background refetching, and optimistic updates. For client state, we start with React context and local state, and only introduce a dedicated store (Zustand or Jotai) when the complexity genuinely demands it. This keeps the codebase simple and avoids the over-engineering trap.

For complex forms, we use React Hook Form with Zod validation schemas — providing type-safe form handling with excellent performance even on forms with hundreds of fields.

Performance and Long-Term Maintainability

React performance problems usually come from three sources: unnecessary re-renders, large JavaScript bundles, and slow data fetching. We address all three systematically. For re-renders, we use React DevTools profiling and proper memoization where measurements show it matters. For bundle size, we implement code splitting with React.lazy and monitor sizes in CI with bundlewatch.

A codebase that only the original developer can understand is a liability. We structure every React project with clear conventions: feature-based folder structure, consistent naming, shared component libraries documented in Storybook, and comprehensive README files that explain architectural decisions. We also set up ESLint with strict rules, Prettier for formatting, and Husky pre-commit hooks to keep code quality high over time.

Technologies We Use

ReactNext.jsTypeScriptTailwind CSSTanStack QueryZustandStorybook

Frequently Asked Questions

Should I use Next.js or plain React?
For most new projects, Next.js is the right choice. It provides server-side rendering, file-based routing, API routes, and excellent deployment options out of the box. Plain React (with Vite) makes sense for SPAs that do not need SEO, embedded widgets, or micro-frontends where you need minimal footprint.
Can you work with our existing React codebase?
Absolutely. We regularly join existing projects to add features, fix performance issues, upgrade dependencies, or refactor architecture. We will do a codebase audit first to understand the current state and recommend a practical path forward — not a rewrite for the sake of rewriting.
How do you handle design implementation?
We work from Figma designs and implement them as responsive, accessible React components. We use Tailwind CSS or your existing styling approach, set up design tokens for consistency, and document components in Storybook so designers can review implementation against their designs.
What does a React project typically cost?
A focused React application — for example, a customer dashboard with authentication, data tables, and a few CRUD workflows — typically runs $20,000 to $50,000. Larger applications with complex data visualization, real-time features, or extensive form workflows range from $50,000 to $100,000+.

Need a React Application Built Right?

Let us talk about your frontend requirements. We build React applications that are fast, tested, and maintainable — not just functional.

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