Feature-Rich Android App

I’m looking for a skilled Android developer to create a brand-new app built exclusively for the Android platform. At this stage I need three core capabilities implemented and running smoothly:

• User authentication
• Push notifications
• In-app purchases (Google Play Billing)

The authentication flow should be secure, scalable, and easy to extend (email, phone, or social sign-ins—whichever you recommend and can implement efficiently). Push notifications must arrive reliably in the foreground and background with deep-link support. For purchases, I want a clean integration with Google Play that handles one-time purchases as well as potential future subscriptions.

I already have rough wireframes and brand guidelines ready to share once we begin. I’ll rely on you for:

– Setting up the project in Android Studio with modern architecture (Kotlin preferred)
– Implementing the three features listed above, fully tested on recent Android versions
– A responsive UI that looks good on phones and tablets
– Clean, well-documented code and a brief hand-off guide so I can maintain or expand later

Deliverables:
1. Source code in a Git repository
2. Signed release APK/AAB ready for Play Store upload
3. Short setup & build document

Acceptance criteria:
• Users can register, log in, and log out without errors
• Test push messages reach the device consistently
• A test product purchase completes and is acknowledged correctly

Timeline and milestones are flexible; let’s discuss what you’ll need to hit each of these checkpoints.