freelancer for supabase postgres apps react concurrent mode freelancer for responsive landing pages react compiler optimization freelancer for multi-tenant saas apps freelancer for admin dashboard ui freelancer for multi-language app support react edge computing dotnet core development react component-driven development freelancer for biometric time tracking zustand react state library https://king-pin-virtual-pinball37526.uzblog.net/5-tips-about-software-developer-banner-for-linkedin-you-can-use-today-49989357