Dear Sir, I hope you are doing well.
I am happy to place my proposal for your project. I have developed multi vendor app for android & iOS app include vendors app, customers app, delivery app and admin panel just months ago. I can complete your app in time. I have been working in Android & iOS development for over 8 years.
I am very interested in your project, and I will be happy to help you complete this project perfectly.
I am sure that I can complete this successfully with high quality. I wish to discuss about project more detail on chat.
Thanks.