Hi, My Bid is for Android App development and backend development using Php/Mysql. I have quite a strong knowledge working with Android and Web design technologies. However, You need to bear the cost for Database, hosting, graphics/design, chat sdk, sms gateway or if any such things are there. I know integrating payment gateway like paypal and integrating send bird chat sdk and applozic chat sdk. You will get honest communication with me. I ensure You an awesome product.Thanks.