Cross-Platform E-Commerce App Build

I’m looking for a skilled mobile developer to turn my online store into a polished native experience on both iOS and Android. The goal is a seamless shopping journey—from discovering products right through to secure checkout—launched in the App Store and Google Play under my brand.

Here’s how I see the work unfolding:

• Design & build: Craft an intuitive interface, hook it up to my existing product data, and integrate the payment gateway I’ll specify.
• Testing: Provide a fully functional prototype for user testing on real devices, then refine based on feedback.
• Store submission: Prepare all assets, handle compliance, and guide the apps through Apple and Google review.
• Post-launch: Fix any critical issues that pop up during the first weeks live.

Please tell me which tech stack you recommend—whether native Swift/Kotlin, React Native, Flutter, or another approach—along with a rough timeline and links to e-commerce apps you’ve already shipped. If you have suggestions on additional features that could boost conversions, I’m all ears.