Rich SaaS dashboards. React’s declarative state model, combined with libraries like Zustand or Redux Toolkit, makes it straightforward to sync complex domain data with UI without race conditions. Server components stream critical above‑the‑fold charts in <200 ms Time to Interactive on typical enterprise hardware.

E‑commerce and marketing sites. Next.js 15’s partial prerendering lets us ship product pages that hit Core Web Vitals while still supporting dynamic pricing, A/B testing, and personalised recommendations.

Cross‑platform design systems. A single React component library can power the web app, an Electron desktop version, Storybook documentation, and React Native wrappers, keeping brand consistency and reducing design debt.

Micro‑front‑end ecosystems. React’s context isolation and module‑federation tooling allow independent teams to deploy features on their cadence without blocking the monolith, all while sharing a design‑token pipeline.

Core runtime

• React 19 with server components, fine-grained Suspense, and useOptimistic for latency masking.

• TypeScript 5.5 strict null checks, generics with template constraints, and incremental builds that shave seconds off CI.

Rendering frameworks

• Next.js 15 for hybrid static + server rendering, route-level streaming, and edge-runtime middleware.

• Vite 6 + React Server DOM plugin for projects that need bare-metal control over the bundler without losing server-component benefits.

Data layer

• TanStack Query 6 for cache-synchronised REST/GraphQL data with automatic background refetch.

• Apollo Client 4 running in suspense:true mode for granular rendering waterfalls.

• Server Actions (experimental) to co-locate mutations with server components, eliminating client-side fetch boilerplate.

State and side-effects

• Zustand for local component scopes; Redux Toolkit when a global timeline is required (undo, audit, offline persistence).

• XState 5 modelling finite-state machines for critical flows such as checkout or onboarding.

Styling and theming

• Tailwind CSS v4 compiled at build time via native Rust engine; CSS Modules for legacy coexistence.

• CSS variables exported from design tokens, enabling real-time theming and dark-mode support without extra bundles.

Quality and reliability

• Vitest + React Testing Library for unit and integration specs.

• Playwright running in parallel across Chromium, WebKit, and Firefox for end-to-end coverage.

• Storybook 9 with interaction tests to lock UI regressions before merge.

Observability and performance

• Datadog RUM captures real-user Core Web Vitals and tiebacks to traces.

• Sentry v8 aggregates exceptions and React Error Boundaries, enriched with release metadata from GitHub Actions.

• Webpack Bundle Analyzer and React Profiler gate CI if bundle size or commit-time render exceeds thresholds.

Delivery pipeline

• GitHub Actions builds each PR, runs Vitest, Playwright, and Lighthouse CI; artefacts pushed to Vercel preview deployments.

• Production deploys use Vercel’s edge network or AWS CloudFront/Cloudflare Pages for self-hosted needs, with canary rollouts triggered by Datadog SLOs.

• Isomorphic delivery without double maintenance. Server components render UI on the edge or origin, stream HTML, then hydrate only the bits that need client‑side interactivity, cutting JS payload by 30–60 percent on first load.
• Predictable performance at scale. React 19’s selective hydration and the React DOM compiler keep main‑thread work within 50 ms budget even on mid‑tier devices.
• Single design system across platforms. We publish tokens to Figma, CSS‑in‑JS, and React Native simultaneously, ensuring brand consistency and eliminating “just‑for‑web” detours.
• Observability hooks built in. Tracing APIs expose render durations and Suspense waterfalls to Datadog APM; error boundaries surface fatal UI states to Sentry in real time.
• Future‑safe architecture. Modern React is increasingly edge‑native. By adopting server components and streaming today, you avoid a second migration when content delivery inevitably shifts closer to the user.

• Dashboard SaaS Largest Contentful Paint at 1.2 s on corporate VPN (Intel 8th‑gen laptop), down from 3.8 s after migrating to server components and deferred hydration.
• E‑commerce PDP P95 Time to Interactive at 1.6 s on Moto G Power (slow 4G) by pre‑rendering hero block and streaming the rest.
• Multi‑tenant admin console Bundle size reduced by 42 percent (276 kB → 160 kB gzipped) through Vite chunk splitting and replacing Moment.js with Luxon.

Amazon, Airbnb, Booking.com, Netflix, and Skyscanner continue to invest heavily in React across consumer and internal tools, validating its suitability for both hyper‑scale and regulated domains.

End‑to‑end product delivery. Ideal for green‑field projects that need discovery, UX, and React build‑out under one roof.

Architecture review and optimisation. You have a React codebase but Core Web Vitals are failing or bundle size is spiralling, we benchmark, optimise, and leave you with an actionable roadmap.

Team augmentation. Our senior React engineers embed with your crew to accelerate feature velocity, mentorship, or a tricky migration (e.g., to server components).