freelancer for firebase firestore apps react concurrent mode web design hire full stack developer freelancer for pixel perfect development freelancer for headless ecommerce sites zustand react state library react query data fetching technical seo services node.js development freelancer for app deployment and hosting react lazy loading components freelancer for https://stern-nfl-pinball-machine81110.fitnell.com/77187826/the-basic-principles-of-are-game-developers-software-developers