Next.js Development Agency: Build Fast, Rank Higher

Here's the thing -- hiring an agency isn't just buying hours. You're buying a whole system of decisions that would take an in-house developer years to develop instincts for. Architecture choices, SEO strategy, performance engineering, deployment infrastructure -- it all arrives as one coherent package rather than a pile of disconnected pieces you have to stitch together yourself. Freelancers build features. Agencies build systems that rank, convert, and actually hold up when traffic spikes hit. Social Animal has shipped 5,000+ projects across Next.js, Astro, and headless CMS platforms, so we've seen what works and -- maybe more importantly -- what quietly kills a site's performance six months after launch.

Pricing honestly depends on what you're actually building. A marketing site or content platform typically runs GBP 8,000--25,000. But once you're adding auth flows, API integrations, and an admin dashboard, you're looking at GBP 25,000--80,000 for a full web application. Enterprise projects -- think multi-tenant architecture, i18n, programmatic SEO at scale -- start at GBP 50,000. And those numbers aren't ballpark guesses we adjust later. Every project gets a fixed-price quote upfront, so there's no invoice surprise three months in.

We've used App Router exclusively for every new project since 2024, full stop. Server components, streaming SSR, parallel data fetching -- these aren't nice-to-haves you can skip for "simpler" projects. The performance advantages are too significant to ignore, especially for anything SEO-sensitive. Plus, Pages Router is essentially in maintenance mode now. If you're still running a Pages Router codebase, we handle that migration as part of our modernisation service -- it's something we've done enough times that the process is pretty dialled in.

SEO isn't something we bolt on after the site launches -- it's baked into how we write the code from day one. That means metadata API configuration, structured data via JSON-LD, sitemap generation, canonical URLs, and hreflang tags for multilingual builds all get handled during the actual build phase. Not as an afterthought. Core Web Vitals optimisation happens there too, which is why every page we ship hits Lighthouse 90+ scores. So when the site goes live, it's already in good shape for Google -- not starting a six-week remediation process.

Yes, we do migrations -- WordPress, Drupal, Webflow, Squarespace, legacy React apps, you name it. The real kicker with migrations is usually the SEO equity question: years of backlinks and ranking signals that vanish if you handle redirects carelessly. We build full redirect maps to preserve every URL, transfer that equity properly, and in practice typically see Lighthouse scores improve by 30--50 points after the move. Most migrations wrap up in 6--10 weeks depending on content volume and how messy the original codebase is.

Vercel is our default for Next.js deployments -- it gives the best developer experience-to-performance ratio for the majority of projects, and honestly it's hard to argue with that for most use cases. But we're not locked into it. We deploy on AWS too, using Amplify or Lambda@Edge depending on the setup, plus Cloudflare Pages and self-hosted Node.js when a client's infrastructure requirements point that direction. Some enterprise clients in regulated industries specifically need self-hosted. So the deployment target follows the project's actual needs rather than our tooling preferences.