Helo, I saw you post as you are looking for a Web App that can collect data from a Marketplace so here i can help you with the same.
I have 5+ years of experience in web & mobile application iPhone/ iPad/ Android development web services where admin can manage the app from backend.
I have previous experience of working on similar platform
I have completed 200+ projects, with domains ranging from Grocery App, Taxi and Delivery Combined App, Pharmacy App, Doctor App, Dating app Instagram App, Restaurant app, Buy& Sell business app, healthcare, social app, chat app, realestate app, eCommerce app, a dictionary app, etc.
I am looking for positive response. do message me in private chat.
Thanks
Shobha