React Development Services

React is the right choice when the application is interactive, component-heavy, and likely to be rebuilt for the web more than once over the next five years. The hiring market is the largest in frontend, the component ecosystem is the deepest, and the long-term maintenance trajectory is well understood. React is the wrong choice when the page is mostly static content with light interactivity. In that case a static site generator with progressively enhanced JavaScript will load faster, cost less to host, and rank better. We say so during architecture review. We do not start a React project to use React.

Use plain React when the application is logged-in only, SEO is irrelevant, and the deploy target is your own infrastructure. Internal tools, dashboards, admin consoles, and customer portals fit that profile. Use Next.js when public search visibility, server-side data fetching, edge-rendered personalization, or a content surface mixed with a logged-in product all live on the same domain. We document the choice in the architecture review and we will say no to Next.js if the team will not actually use the rendering features that justify its complexity.

Most large React apps end up with three categories of state: server state, URL state, and local UI state. Server state belongs in TanStack Query or RTK Query, where caching, invalidation, and request deduplication are solved problems. URL state belongs in the router. Local UI state belongs in component state or a small Zustand store. Redux Toolkit still has a role for cross-cutting domain state in a few specific applications, but most projects do not need it. The mistake we see most often is putting server data in Redux and then writing custom invalidation logic. We migrate codebases off that pattern more often than we adopt it.

Three layers. Component-level tests run in Vitest with React Testing Library, written from the user point of view rather than the implementation, with MSW intercepting network calls. Integration tests cover the full feature flow inside a mounted app, also under RTL. End-to-end tests run in Playwright against a deployed preview, focused on critical paths rather than coverage targets. We do not chase 100% coverage. We aim for coverage of the paths whose failure would cost the business actual money or reputation.

WCAG 2.2 AA is the baseline we hold every public-facing React build to. That means semantic HTML inside JSX rather than divs everywhere, focus management that survives client-side route transitions, keyboard navigation that works without a mouse, color contrast that meets the 4.5 to 1 ratio for body text, and visible focus indicators. We use Radix UI or Headless UI for primitives that are notoriously hard to get right, like dialogs, comboboxes, and menus. Automated checks run in CI through axe and eslint-plugin-jsx-a11y, and we run manual screen reader passes on critical surfaces before a release.

Yes, this is a common engagement type for us. The first two weeks are an audit: dependency graph, bundle analyzer report, render-performance pass, dead-code detection, accessibility regressions, and a state-management map. We document what we find, flag what is unsafe to keep shipping on, and propose a sequenced stabilization plan that does not require a feature freeze. From there our senior engineers take ownership through Team-as-a-Service or a fixed-scope stabilization engagement, depending on what fits your situation.