Next.js SEO: How We Hit 100 Lighthouse SEO Scores on Client Sites
March 5, 2026 · 10 min read · Sparken Technologies Engineering
Server rendering, structured data, and the Core Web Vitals playbook behind sites that rank — with the exact schema we ship.
SEO is an engineering problem first
A lot of SEO advice is about content and keywords, but for a modern web app the foundation is technical: can search engines crawl your pages quickly, render them correctly, and understand what they're about? Get the engineering right and content does its job; get it wrong and the best content in the world stays invisible.
Server rendering by default
Client-side-only rendering makes crawlers work harder and slows the first paint. We render pages on the server or generate them statically so content is in the HTML on first request — fast for users, trivial for crawlers. Next.js makes this the default path rather than a special case.
Structured data, shipped on every page
We ship JSON-LD structured data — Organization, Breadcrumb, FAQ, and Article schema — so search engines can render rich results and understand the relationships between pages. This is the difference between a plain blue link and a result with ratings, FAQs, and breadcrumbs attached.
Core Web Vitals as a budget
We treat performance as a budget, not an aspiration: optimized images, minimal client JavaScript, and careful font loading keep Largest Contentful Paint and Cumulative Layout Shift in the green. The payoff is sites that score 95+ on Core Web Vitals and rank because they genuinely deserve to.