WhatsApp Cloud API Developer — LangChain/LangGraph, Webhook Handling, CRM Integration

We're building a B2B WhatsApp CRM platform on the WhatsApp Cloud API. We have an existing codebase built with Javascript, and LangChain/LangGraph for conversational AI flows using Whatsapp. We need an experienced developer to extend this codebase — not start from scratch. You must have hands-on experience with: -WhatsApp Cloud API and webhook handling (not unofficial APIs or ManyChat/Respond.io) -Meta embedded signup flow -LangChain and/or LangGraph — stateful multi-turn conversation flows specifically -Twilio number provisioning Work includes: Forwarded message detection and routing flow Unknown number identification and CRM linking Internal notes flow with AI entity extraction WhatsApp notification handling Template management via API This is a multi-month engagement for the right person. We move fast and expect clear communication. To apply, please answer these two questions in your cover letter: -How does a forwarded WhatsApp message differ in the webhook payload from a regular inbound message? -Describe a stateful multi-turn conversation flow you've built using LangGraph or LangChain — what did the graph look like and how did you manage state between turns?