How I built a pSEO app with Next.js 14 generating 500+ static pages (Case Study)

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Hello devs! 👋

I wanted to share a weekend project I just deployed to test the limits of Next.js 14 (App Router) and Static Site Generation (SSG).

The challenge was to build a Brazilian Labor Calculator (Rescisão Fácil) that is “future-proof”, implementing tax rules projected for 2026 (specifically the new Income Tax exemption up to R$ 5k).



🛠 The Stack

  • Framework: Next.js 14 (App Router)
  • Styling: Tailwind CSS + Shadcn/UI (focused on Mobile Performance)
  • Architecture: Programmatic SEO (pSEO)
  • Deploy: Vercel



âš¡ Performance & pSEO

Instead of a generic calculator, I used generateStaticParams to pre-render over 500 unique pages for specific job titles (based on the official Brazilian Occupation Classification – CBO).

I also implemented content-visibility: auto CSS property to handle large DOM lists (400+ links), achieving a 98+ Performance Score on Mobile (PageSpeed Insights).



🚀 Live Demo

You can check the live performance and the 2026 tax logic here:
👉 https://www.rescisaofacil.com.br

I also created a public repository documenting the architecture:
GitHub Docs Repo

Feedback on the UX/Performance is welcome!



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