Android E-Commerce App Development

I have a clear concept for an e-commerce app and a draft requirements document ready to share. The first release will target Android only, so Kotlin or a modern cross-platform toolkit that compiles natively for Android is fine as long as performance stays smooth... (Budget: ₹12500 - ₹37500 INR, Jobs: Android, Android App Development, Backend Development, Database Administration, GPS, JavaScript, Mobile App Development, Payment Gateway Integration, System Admin)