Looking for React Native App/PHP Developer

Small project, have bought a react native app. You need to build it, tweak the UI a bit and add few new features developing and extending APIs.
Would prefer someone who is familiar with CS-CART file structure.

Work:
- Modifications in registration form.
- Animated flash screen
- Add payments page displaying data of payments made and payment pending.
- Implement quantity discount (Already implemented in back-end)
- Implement payment gateway (Already implemented in back-end)
- Display static OTP of order in app
- Tweak the existing UI and make it attractive

Budget is more or less fixed, flexible with time though.
Will discuss more over chat.