freelancer for supabase postgres apps react concurrent mode freelancer for responsive landing pages freelancer for cross-browser testing freelancer for multi-tenant saas apps web design react wasm integration responsive web design freelancer for headless ecommerce sites freelancer for biometric time tracking jotai state management seo expert for hire freelancer for https://acdc-pinball68911.laowaiblog.com/35258442/the-2-minute-rule-for-web-developer-zone