Need a MongoDB, Typescript, Express.js, Node.js backend developer to create a secure payment gateway to automate crypto withdraws for a online casino.

I need a senior backend developer (MongoDB, Typescript, Express.js, Node.js) to create a payment system to automate withdrawals of Litecoin and Ethereum for an online casino. You must have excellent understanding of blockchain and the technologies above, and you will be working off of existing backend/frontend code.