Hi,
I am M Santosh Kumar, professional software engineer with more than three years of experience in developing, designing and manageing products. I have worked on various webapp similar to your use case and recently I was working an web app with excel sheets import and export of new excels with user defined logic. I have worked on total of 8 projects with regards to web apps. I have worked with clients such as NBA(miami heats backend migration, Sacramento kings backend migration, Atlanta Hawks), F1(opin integration), octobus(political analyzer).
Tech-stack: Nodejs, Reactjs, Electronjs, Javascript, Mongodb, Postgresql, AWS, docker, devOps.
If you my profile apt and want to coordinate with me , please drop me a message - I will be there to help you out with a solution.
--cheers!!!