Hire Next.js Developers — Server-Side React Experts

Next.js introduces a rendering model — App Router, server components, server actions, ISR, streaming — that requires specific expertise beyond React fundamentals. A specialist knows when to use a server component versus a client component, how to avoid hydration errors, and how to cache data correctly for your performance and freshness requirements. Getting this wrong leads to slow pages, stale data, or expensive re-builds.

Standard start time is 48 hours from contract signing. We maintain bench capacity for Next.js developers at all times. For developers with specific expertise — e-commerce, large-scale ISR, edge runtime — a one-week lead time is more realistic.

App Router is our default for all new Next.js projects. It provides a superior developer experience with React Server Components, nested layouts, and streaming. For existing projects on the Pages Router, we work within that model and can plan a gradual migration to App Router when the project scope allows it.

Next.js caching has four distinct layers: the Request Memoization cache, the Data Cache, the Full Route Cache, and the Router Cache. Our developers understand how each layer interacts, configure revalidation strategies (time-based ISR, on-demand with revalidateTag), and avoid the common pitfall of over-caching dynamic data or under-caching static content.

Yes. We have integrated Next.js with Contentful, Sanity, Strapi, Prismic, and custom CMS solutions. We implement type-safe content schemas, preview mode for draft content, on-demand ISR revalidation triggered by CMS webhooks, and image optimisation pipelines that respect CDN delivery.

Core Web Vitals optimisation is a core deliverable on every Kultrix Next.js engagement. We audit LCP, CLS, and INP using Lighthouse and Chrome User Experience Report data, then apply targeted improvements: server-side rendering for above-the-fold content, next/image with correct sizing, font optimisation with next/font, and elimination of layout shifts from dynamic content.

Yes. We implement authentication with NextAuth.js (now Auth.js) for social and credential-based login, with session management via JWT or database sessions. For enterprise requirements, we configure SAML SSO, OAuth 2.0 flows, and RBAC middleware. We also work with Clerk, Auth0, or Supabase Auth as managed alternatives.

Vercel is our recommended deployment platform for Next.js — it provides the best integration with Next.js caching, Edge Functions, and Image Optimisation. We also deploy Next.js to Railway, Fly.io, and AWS App Runner when Vercel is not appropriate for the project. Self-hosted deployments with a standalone output configuration are supported too.

Yes. We regularly join live Next.js projects — adding features, fixing performance bottlenecks, upgrading from Pages Router to App Router, or migrating from Next.js 12 to Next.js 15. We start with a code audit focused on rendering strategy and caching correctness before proposing changes.

Yes. We implement internationalisation using next-intl or next-i18next — configuring locale detection, routing, and message loading. For large multilingual sites, we implement hreflang tags, locale-specific sitemaps, and CMS-driven translation workflows that allow editors to manage content in each language independently.

We write unit tests with Jest for utility functions and server actions, component tests with React Testing Library for client components, and end-to-end tests with Playwright for critical user flows including authentication, forms, and checkout. We also configure Lighthouse CI in GitHub Actions to catch Core Web Vitals regressions on every pull request.

We offer monthly retainer and time-and-materials models. Retainer engagements lock in a fixed developer allocation at a fixed monthly fee with guaranteed availability. T&M engagements are billed weekly against tracked hours with full transparency. Both models include a dedicated account manager and weekly progress reporting. Minimum engagement is one month.