I am looking for an experienced backend developer to build a Service Booking Automation System on WhatsApp. The project involves connecting users with service providers using AI parsing and automated workflows. We are not building a mobile app. This is a pure WhatsApp Automation project using official APIs. Core Technical Requirements: WhatsApp Business API Integration: Experience with BSPs (like Interakt, Wati, or Twilio). AI Integration: Connect OpenAI (GPT-4) to parse unstructured user messages (e.g., extracting date, location, and intent from chat). Database Management: Proficiency in Supabase (PostgreSQL) to store user data and active requests. Geolocation Logic: Ability to filter database entries based on "Location Pins" (Lat/Long) shared on WhatsApp. Broadcast & Timer Logic: Create a function where a request is sent to a group of users, and the first one to click "Accept" gets the job. Tech Stack: Frontend: WhatsApp Interface Backend: Node.js / Python (FastAPI) or n8n (Low-code) Database: Supabase / Firebase AI: OpenAI API Important: You will be working on Generic Modules initially. NDA (Non-Disclosure Agreement) is mandatory before sharing the final workflow. We need clean, documented code.