AI Developer for AI Restaurant Receptionist

We're looking for an experienced AI developer to build an intelligent AI receptionist for our restaurant brands. This is for our internal operations only, not a SaaS platform. The AI should answer incoming customer calls, allow customers to scan a QR code and chat naturally, answer menu questions, recommend items or add-ons, take complete orders, confirm details, and send the final order to our WhatsApp for staff preparation. No POS integration needed for version1. Preferred tech: OpenAI API, voice AI integration, WhatsApp Business API, Node or Python backend, basic admin panel for menu updates. Deliverables: source code, documentation, and deployment assistance. Budget: to be discussed. Timeline: propose in your application with milestones. Requirements: show previous AI or chatbot work. Nice to have: function calling experience. Please include timeline, examples of similar projects, and a brief architecture approach.