We are experienced hybrid app builder that we have been building apps integrating with social media accounts login, sending messages, notifications, thumbnail photos of products, showing products detail in categories, payment gateway, gps to show the nearest route, loyalty reward system, able for backend to add/edit/upload files etc for our clients, etc would you please provide more information for us, so we can study it carefully to give you a more accurate quote and to see what we need to do in order to fulfill your requirements, thanks!