I need a clean, performant Android e-commerce app built from the ground up. The core of the project revolves around a smooth product catalogue experience that lets shoppers browse, search, and filter items without lag. A secure, fully integrated payment gateway must be in place so buyers can complete purchases inside the app rather than being bounced to a browser. Shoppers should also be able to leave ratings and text reviews, both to boost trust and to help with product discovery. Sign-in will rely on social media credentials only—no traditional email/password flow. If you prefer Firebase Authentication, Facebook/Google SDKs, or another reliable SSO option, that works as long as setup is straightforward for end users and easy for me to manage. Because I will eventually submit the app to Google Play, the final build has to meet the latest Play Store guidelines and target the current API level. A lightweight, maintainable codebase—whether Kotlin or Java—is fine so long as it’s well-documented and structured for future feature drops. Deliverables • Complete Android Studio project with source code • APK/AAB ready for Play Store submission • Integrated payment gateway running in sandbox and production mode • Social login fully tested (at minimum Google & Facebook) • Basic admin guide covering product upload, price edits, and review moderation Let me know if you have relevant store links or demo builds I can review to speed up selection.