Build a forecasting app for mobile devices

Hi, I have over 20 years experience in programming with more than 15 years in web development and quite some years with mobile apps. As far as I understand your project you need some app to calulcate some forecasts based on user input (speadsheets) and show them up as graphs. Please provide me with more details or documents - if you have. So we can talk about the specifics. I do the "agile development" approach - meaning, that through the entire process I update you with new versions, as soon as it has some major changes / new functions. You can than check the progress and we can talk about how you like it and what has to be changed. I would start with a MockUp - setting up the user interface for the app, every button, ... will be there but with dummy data and clicking buttons will not do anything (in most cases). Then I will make this app alive by adding functionality. I will be happy to hear from you soon. Best regards, Fabian