I have done this! I am the best candidate to do this project. We have fully ready cloud based secure platform for your needs. We have ready templates and android app. Recently built a large web/mobile game portal for a European client that includes fully working cryptocurrency integration, paypal, dashboards, integrations,reporting, membership system-its working. It went live last month and they will have 1000 +users. Please let me know more details and we can connect to make your web/mobile app via rapid delivery! We are a young startup from Pune, India