NetWage
Multi-country gross-to-net salary simulators, computed from official rates.
the problem
Gross-to-net math differs radically from one country to the next, and official sources are scattered. Generic multi-country calculators simply get it wrong.
the solution
A dedicated calculation engine per country (FR/US/ES/CA), built from official rates, rendered with Astro SSG: 160+ pages, full i18n, edge geo-routing via Cloudflare Workers.