Hello,
This looks like interesting project, so I would like to work with you. I can do design, development and launching part.
1. My agency is is working for 5 years in many fields of programming, but our primary fields are mobile applications, so I'm sure that i can help you create your app.
2. I've worked on many application with the same functionality as yours. I'm sure that i can use my previous code, so i can create your app for sure. If you are interested i can send you some pictures and videos of my previous applications.
3. I think that I'm the best for this project because I'm an expert in Android programming and I'm sure that i can give you a few more ideas for your app, so it will be the perfect one for customers.
I really hope that we will work great together. Let's discuss more about it, so I can create a full detailed plan about time, price, etc...Have a nice day!
Regards, Andrija