Next.js Development Agency — SSR & App Router

Next.js adds server-side rendering, static site generation, file-based routing, image optimization, and API routes on top of React. This means faster initial page loads, better SEO, and less boilerplate — all out of the box.

For new projects, we recommend the App Router (Next.js 13+). It introduces React Server Components, nested layouts, streaming, and Server Actions which reduce client-side JavaScript significantly. The Pages Router is still supported and fine for existing codebases.

Next.js renders HTML on the server, so search engine crawlers see real content immediately. Combined with the Metadata API, structured data, and fast Core Web Vitals scores, Next.js sites consistently outperform SPAs in organic search rankings.

Incremental Static Regeneration (ISR) lets you pre-render pages at build time and re-generate them in the background after a set interval. It is ideal for content that changes infrequently — blogs, product pages, and landing pages — giving you static performance with dynamic content.

Yes. Server Actions let you run server-side logic directly from form submissions and event handlers without creating API routes. They simplify data mutation workflows and reduce client-server boilerplate significantly in App Router projects.

Yes. CRA migrations are a common engagement for Kultrix. We incrementally convert your app to Next.js, preserving existing functionality while adding SSR, improved routing, and performance gains. We handle the migration without disrupting active development.

We typically use NextAuth.js (Auth.js) for session-based auth with social providers and credentials, or integrate JWT-based auth with an external backend. Middleware-based route protection ensures authenticated pages never flash unauthenticated content.

For most Next.js projects we use PostgreSQL with Prisma ORM — it gives you type-safe queries, migrations, and excellent Next.js integration. For simpler use cases, SQLite with Turso or Supabase works well without managing infrastructure.

Vercel is the natural home for Next.js — zero-config deployments, edge network, and preview URLs per pull request. For self-hosted deployments, we configure Docker containers on Railway, AWS ECS, or bare VMs with proper caching and health checks.

We audit bundle size with @next/bundle-analyzer, use dynamic imports for heavy components, configure aggressive caching headers, optimize images with next/image, and monitor Core Web Vitals in production with real user monitoring.

Yes. Statically generated Next.js pages served from a CDN can handle virtually unlimited traffic. For dynamic routes, we implement edge caching, Redis-backed API responses, and horizontal scaling. Kultrix has deployed Next.js platforms serving millions of monthly visitors.

A marketing site or blog in Next.js takes 3–6 weeks. A full SaaS platform built on Next.js takes 3–6 months depending on feature scope. Kultrix provides a phased delivery plan so you see working software early.