Make changes to React/Web3 app

Job ID: 31234170

Budget: £10 – £20 GBP

I have a basic erc20 token exchange Dapp . It uses react/web3 on the front end, it uses private blockchain on ganache.
The exchange is currently decentralized and required metamask, it works like this:

Dapp connects to metamask
User deposits ETH to exchange contract
User can then make orders and fill orders on the contract

I require the following change:
Remove the need for metamask and hard-code an address/private key (Just for one player) so that transactions are automatically signed. (the address/private key should be stored in a file so i can change it)

must know how to use erc20 blockchain/ganache
Related categories: React.js Blockchain Ethereum