We have many years experience working with Excel, VBA and writing complex formulas for a variety of clients from sole traders to Fortune500 companies.
We have also worked with Google Sheets and Google App Script since inception.
We also write custom Python scripts to integrate with Google Sheets when needed, App Scripts has a Time/Data limits and in the case of complex data manipulation or large datasets this maybe needed. We can host this on our servers for a small monthly fee or you can self manage, whichever you prefer.