Looking for XRP ledger Expert!

Hi,
This is a kind of DEX project
Are you familiar with XRP?

Milestones are following.
-Develop backend with XRP ledger(smart contract): $500
1. You must Show the result with video.
After the code is delivered, pay $500 3 days

-Integrate the frontend and backend:
We will check result on Vercel (or comparable). should be fully integrated frontend with smart contract.
2. After check it on testnet, pay $400 4 days
3. After deploy all on mainnet, pay $600 5 days

Total $1500, 12 days

These are the requirements for this project:
Swap on XRP Ledger
-Connect wallet with Xumm app or Ledger device.
-Select tokens from XRP Ledger tokens (including DBX Coin, I will send token address tomorrow).
-Peer-to-peer Swap format.
-Trade is executed when buy order is matched with sell order.
-Trading fee (to exchange) = 0.25%

Regarding the Factory and Router, I am not too sure about this. The Swap will be a copy of XRPLCoins.com/swap.

If you are ready, I will share frontend, you can start right now.

Note: Don't apply to this job if you are not good fit to XRP.
I will ask technical XRP ledger questions to you.

Regards