Why We Moved Our Client Stack to Next.js

Most of our client work used to ship as a plain React SPA with react-router-dom handling navigation. That's fast to prototype, but it costs real SEO and load-time performance once a site needs to rank or load well on a slow connection. Moving to Next.js App Router gave us server-rendered pages by default, file-based routing that matches how clients think about their sitemap, and image optimization we no longer have to hand-roll. For agency work specifically, it also means every new client project starts from the same predictable folder structure, so handoffs between our frontend and backend developers are faster. The migration itself is mechanical once you've done it once: routes become folders, react-router Link becomes next/link, and anything using browser-only APIs gets a "use client" boundary. The bigger win is what it unlocks afterward — streaming, partial prerendering, and route-level metadata that used to require a separate SEO pass.