Develop a web app and charge us monthly subscription

We need to design a web application that will search numbers from multiple cells from multiple excel files according to user input in the UI and display the results accordingly. Our involvement: We will give you the full description. We will pay for the server if you want it that way. We will not pay for the development. Your involvement: You will develop it according to the agreed terms. You will charge us agreed amount on monthly subscription basis for the agreed duration. If interested, we will agree on terms sign contract - as you want.