⁠Full Stack MERN Developer Needed for Third-Party API Integration⁠

We are seeking an experienced MERN Stack Developer (MongoDB, Express, React, Node.js) to integrate third-party APIs into our existing application. Key Responsibilities: Integrate third-party REST / GraphQL APIs into Node.js/Express backend routes. Securely manage API keys, environment variables, and authentication tokens (OAuth 2.0 / JWT). Implement webhooks with signature verification (e.g., Stripe, Twilio, PayPal). Connect backend API responses cleanly to the React frontend state. Implement error handling, rate limiting, and request retries. Requirements: Proven experience with Node.js, Express, React, and MongoDB. Hands-on experience integrating APIs (Payment gateways, Email/SMS services, Maps, AI/Cloud APIs). Clean coding practices and strong communication.