react streaming ssr freelancer for app refactoring and cleanup back end developer freelancer for cross-browser testing website development mern stack development company react devtools ai assistant react wasm integration dotnet core development freelancer for realtime dashboard freelancer for biometric time tracking reactjs freelancer nextjs app development web development firm https://beckettlqsss.blogs100.com/36922233/how-software-developer-key-skills-can-save-you-time-stress-and-money