freelancer for firebase firestore apps hire react developer react concurrent mode freelancer for multi-tenant saas apps web design react devtools ai assistant react wasm integration freelancer for pixel perfect development freelancer for headless ecommerce sites jotai state management freelancer for openai integration web design and development react development freelancer https://erickihez111111.madmouseblog.com/16892094/the-5-second-trick-for-developer-software-engineer-salary