Full stack help needed using Node.js React and MongoDB

I have a webapp that needs to be updated with new features. I am adding the new features in Base44's AI. The new code created by Base44 needs to be exported into my hosting site 'Hostinger' and cleaned up so it runs properly. I don't like using 'hourly work' because that turns me into a micro manager and nobody likes that. Instead I want to do project pricing based on the new features I am adding.