Automated Whatsapp Booking System Integrated with Google Calendar

We are seeking a skilled developer to create an automated booking system that operates entirely through WhatsApp. The primary goal is to allow clients to schedule appointments seamlessly via text messages, without requiring human intervention. The system must integrate with Google Calendar to check availability, book slots, and send confirmations.

Key functionalities required:
- WhatsApp integration for receiving and sending automated text messages.
- Google Calendar API integration for checking real-time availability and creating new appointments.
- Text-based conversational flow for clients to select services, dates, and times.
- Automated confirmation messages sent to clients upon successful booking.
- Ability to manage and update appointment details (e.g., Cancellations, rescheduling) through WhatsApp commands.
- Robust backend logic to handle concurrent booking requests and prevent double-bookings.

The ideal freelancer will have experience with WhatsApp Business API (or similar messaging APIs), Google Calendar API, and developing robust, scalable backend systems for automated services. The solution should be reliable and user-friendly, providing a smooth booking experience for our clients.and also send appointments reminders 24 hrs before.