We are looking for an experienced developer/team to build a custom bulk WhatsApp messaging platform for our business. Key Requirements: 1. Integration with Official Meta WhatsApp Business API 2. Ability to connect our WhatsApp number via API 3. Bulk WhatsApp message sending (text, image, PDF, video) 4. Contact upload & management (CSV / Excel) 5. Message templates approval via Meta 6. Delivery status (sent, delivered, read, failed) 7. Basic chatbot / auto-reply functionality 8. Dashboard for campaign management 9. Compliance with Meta/WhatsApp policies (no spam tools) - Tech Expectations: Backend + Admin panel Secure API handling Scalable architecture One-time build preferred (not SaaS subscription) - Ideal Freelancer: Proven experience with Meta WhatsApp API Previous work on WhatsApp automation / CRM / messaging platforms Can guide us on Meta Business setup if required - Please share: Relevant portfolio or demo Tech stack suggestion Estimated timeline & cost