react developer freelancer for app refactoring and cleanup back end developer nextjs seo optimization react signals state management freelancer for admin dashboard ui full stack web developer freelancer for multi-language app support web development company web development services jotai state management react query data fetching freelancer for langchain agent https://sternpinballmachineparts71368.sharebyblog.com/36165316/the-2-minute-rule-for-software-developers-working