Hello ,
I read your description and I think that I can help you in it,
I am a master of Excel managing in java,
very good on Gui javafx too, doing many program like this before,
I am experianced software engineer, java developer i developed many java programs for seven years, I am good at javaFx, spring framwork, JavaScript too, Poo, design petterns and IA algorithms.
I can do any change in your project
I am good at calculations, ready to ensure long maintenance of your application in future with acceptable price.
Best regards.