Custom B2B Fintech Platform Build

I need an end-to-end, production-ready B2B fintech platform that covers both a custom-developed website and a native Android app. The solution must support secure user authentication and a rock-solid transaction... (Budget: ₹37500 - ₹75000 INR, Jobs: Android, Android App Development, AngularJS, API Development, HTML, Payment Gateway Integration, PHP, Web Development)