ShipStation API Integration Developer

We are seeking an experienced API / Full-Stack Developer to integrate ShipStation / ShipEngine into our GoShipAxis shipping platform. Responsibilities include reviewing our ShipStation setup, securely connecting API credentials, retrieving shipping rates, creating shipments and labels, setting up tracking, webhooks, address validation, and error handling. Additionally, you will build a branded customer shipping flow, create customer accounts/login, build membership levels with access/benefit controls, and integrate secure payment processing for memberships and shipping transactions. Maintain separate test and production environments. Preferred experience includes ShipStation, ShipEngine, REST APIs, webhooks, Stripe/payment integrations, subscriptions, Node.js, JavaScript/TypeScript, React, databases, and carrier APIs. Confidentiality is crucial, and an NDA may be required.