Amazon Seller Central API Integration

I need an engineer who already knows the Amazon Selling Partner API inside-out to wire it into our current web-based application. My team has built the front end and core business logic; what we’re missing are the secure, well-structured endpoints that let us talk to Seller Central in real time... (Budget: ₹5000 - ₹20000 INR, Jobs: API Integration, JSON, MySQL, Node.js, NoSQL Couch & Mongo, PostgreSQL, REST API, Web Development)