Deploy Offline Android App Online

I have a fully-working Android application that currently runs only in offline mode. I now need it moved online so users can access live data through a dedicated server. No new features or UI changes are required—the goal is a straight deployment that preserves all existing functionality... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, Android App Development, Android Studio, API Development, Backend Development, Java, Mobile App Development, MySQL)