Multilingual website PL / CS / EN — how to do it right

Three languages on one site isn't /en/ + Google Translate. Each version must be a full-fledged SEO ecosystem.

URL structure: /pl/service, /cs/sluzba, /en/service. Each with its own title, description, schema.org. Hreflang in head everywhere.

Auto-detection: server-side by IP (Cloudflare geolocation), with manual override. Never redirect without a way back.

Translations: AI (GPT-4.1 / DeepL) as first draft, native speaker for SEO polish. Never raw machine translation in production.

Local SEO: separate Google Business Profile, local backlinks, market-tailored content (Czech isn't a translation of Polish — it's new text).