Android Shopping App with Payments

I’m looking for a developer who can build a lean, production-ready Android shopping app that does one thing exceptionally well: move users from “Add to Cart” straight through a secure checkout and payment gateway.

Scope
• Native Android build (Java or Kotlin) that runs smoothly on the current OS versions.
• Core screens: simple product view (fed by my existing API), cart summary, shipping details, payment screen, and order confirmation.
• Integrated payment gateway—Stripe is preferred, but I’m open to your recommendation as long as it supports major cards and works worldwide.
• Guest checkout only; no user sign-up or login flows.
• Clear error handling, validation, and success/fail callbacks so I can track each order’s status on the backend.
• Deliverables: clean, well-commented Android Studio project, compiled APK, and short setup README.

Nice to have (not mandatory but welcome): coupon field, order history cache, and unit tests.

I’ll provide the product API docs and brand colors once we start. Please let me know how you plan to structure the checkout flow, which payment library you’d choose, and any similar apps you’ve shipped.