freelancer for supabase postgres apps react concurrent mode back end developer website development web design freelancer for multi-language app support dotnet core development web design company freelancer for biometric time tracking web design services jotai state management freelancer for openai integration react hook form performance forms vue.js development angular https://pinballmachinemontreal43197.bloguetechno.com/how-software-developer-key-skills-can-save-you-time-stress-and-money-71501979