Build a Node.js Conversation State Engine for an AI Assistant (OpenAI + MySQL)

I am looking for an experienced Node.js developer to build a proof-of-concept Conversation State Engine for an AI assistant. This is a backend-only project. No frontend or admin panel is required. The application should: Store conversation state in a database. Extract structured data from user messages. Track conversation progress using a deterministic state machine. Inject the current conversation state into OpenAI prompts. Separate conversation, state management and calculations. Prevent repeated questions, loops and forgotten context. The project is intended as a proof of concept before integrating it into a larger Laravel application. Experience with Node.js, OpenAI APIs, MySQL/SQLite and AI agent architecture is required.