AI Chatbot Integration into Website, Next.js + OpenAI API

I need an experienced Full Stack Developer to integrate AI chatbot into an existing website. The chatbot should allow users to ask questions and receive responses powered by the OpenAI API (ChatGPT). Scope of Work - Build a clean, minimal chatbot UI component (React/Next.js) - Connect chatbot to a Node.js backend API - Implement conversation flow, user messages, AI responses, loading states - Style the chatbot to match the existing website design - Deploy, test, and deliver working feature Required Skills - Next.js - Node.js - OpenAI API integration - Chatbot UI development - REST API development What I'm Looking For Someone who has done this before, not learning on my project. Please share examples of AI chat features or similar integrations you've built. Budget is fixed at $70–$80. Serious applicants only.