react streaming ssr react concurrent mode back end developer freelancer for cross-browser testing website development web design freelancer for design to code react component-driven development custom web application development zustand react state library nextjs app development mobile-friendly website django development react memoization optimization freelancer for fly.io deployment ... https://sergionhyne.alltdesign.com/how-software-developer-key-skills-can-save-you-time-stress-and-money-55330235