Hi
My total experience: 8 years in Mobile (iOS, React-Native) and 1.5 yr in the blockchain, wallet creation and transfer ERC20 based token.
I have already worked on wallet creation, transfer ERC20 based token and BTC transfer from one wallet to another.
At the mobile end, I have created the sign transaction and deploy at blockchain. Once get transaction id from blockchain then send txid to our server for managing transaction history.
In the below project I did work this.
PGPay(React-native, Wallet, Blockchain)
Description: This is the blockchain based app. Within this app, we create a new wallet for bitcoin and ether and transfer from one wallet to another wallet. Using QR code, user can send/receive the token and cryptocurrency. Managing transaction history as well at own server.