Mobile Application Developer - freelance

Freelance Senior Mobile App Engineer
We're looking for an experienced mobile engineer to take our existing live web platform, and get us launched as a polished iOS + Android mobile app.
The website, backend and repository are already built. We're not looking to rebuild the product from scratch.
We're looking for someone who can own the mobile implementation and get us from existing web products → live apps in the Apple App Store and Google Play Store.
Scope includes:
Build the iOS + Android application, ideally using React Native / Expo or another appropriate cross-platform approach
Connect the app to our existing backend, APIs and user accounts
Implement the core mobile user flow and navigation
Google Sign-In / authentication
Sign in with Apple / iOS authentication requirements
Ensure deposits, balances, purchases and applicable redemption/buyback flows work properly
Deep linking / universal links
Push notification setup
Mobile analytics and crash/error tracking
Apple Developer + Google Play configuration
Certificates, provisioning, bundle IDs and production signing
TestFlight / Android internal testing
Stripe integration
App Store + Google Play submission
Handle review feedback/rejections required to get the apps approved and live
Basic production QA across major iPhone and Android devices
Important: Experience navigating Apple / Google payment and App Store review policies is highly preferred.
We're looking for somebody who has actually shipped consumer apps to both stores before, not someone learning the submission process for the first time.
Existing experience with any of the following is a major plus:
React Native / Expo, Next.js / React, Coinflow, Stripe or other payment SDKs, Apple Pay / Google Pay, OAuth, Sign in with Apple, e-commerce/marketplace apps, gaming etc.
This is intended to be a fast, focused launch project using an already-built product and backend not a ground-up mobile rebuild.
There can be significant additional work after launch for the right person.
Please DM me with:
Apps you've personally shipped to the App Store / Google Play
Your React Native / mobile experience
Experience integrating payment providers
Whether you've dealt directly with Apple/Google app-review rejections
Your availability to start immediately
Email Shubs@sharpstakes.ca for a quick reply -

Work arrangement
Yes