Create A WebApp based on Python Script

I am looking for an experienced web developer to create a webApp that will serve the purpose of data analysis. The webApp must be built using python programming language and should be responsive. Therefore, I need more information about what it would take to create such an application with responsive design capabilities. The developer I am looking for should be knowledgeable in python and able to create a webApp with intuitive user interface. If you possess the skills needed for this project, please let me know and discuss further details. Thank you!

I got a py file, and it's already run in the terminal. I should process a .xlsx file as input and results some xlsx and json file. I wanna create a website that can browse the input file, processing the file, and having able the user to download the output file.