I remember someone suggesting that when you write a web app you should prototype the design with the client until they like it and then build the backend. Could

I remember someone suggesting that when you write a web app you should prototype the design with the client until they like it and then build the backend. Could something like this let you create a front end responsive design but leave the logic to the backend where you can then make whatever design decisions you want to? Edit: Also, a huge congratulations!