MERN Stack Developer Needed to Integrate Grok AI (xAI API) Into Existing Application

I have an existing MERN stack application (MongoDB, Express.js, React.js, Node.js) and I am looking for an experienced developer to integrate Grok AI by xAI into the application. The goal is to integrate Grok cleanly into the existing architecture rather than building a separate AI application. The developer will work with the existing React frontend and Node/Express backend and implement the required Grok API integration, including proper API handling, error handling, security, and frontend interaction. The integration will use the official xAI API. The current xAI API provides a REST API and OpenAI-compatible JavaScript integration, with the Responses API being the preferred approach for interacting with Grok models.