I run a licensed financial-service platform where customers already hold and transfer our proprietary crypto coin. The next step is to let them liquidate those coins without ever leaving their familiar dashboard. I am looking for a developer who can build and seamlessly embed a “Sell Coin” workflow inside the existing code-base. Your task is to expose a secure end-point that converts the coin to fiat, confirms the rate, executes the trade on-chain, and then records the full transaction history so users can review past sales at any time. The new screens must follow our current UI style, pull user data from our authentication layer, and write sale records to our PostgreSQL ledger so our compliance tools can read them unchanged. Key expectations: • End-to-end sell flow initiated from our platform’s front end and completed through our back-end services • Persistent transaction history visible to the user and exportable as CSV • Clean, well-documented code (Node.js preferred, but I’m open if you can justify another stack) • Clear installation instructions so my internal team can deploy to our AWS staging environment for QA If you have experience integrating blockchain wallets, handling KYC/AML checks, or tying into exchange APIs, please highlight it—those skills will help you move quickly inside our environment. Delivery is source code plus a short walkthrough video demonstrating a successful sell transaction and the resulting history entry.