AI WhatsApp Calendar Reminders Tool

I'm seeking a developer to create an AI-powered WhatsApp calendar reminder tool that integrates with iOS, Outlook, and Google calendars. This will be a SaaS application with a responsive website for managing subscriptions.

Key Requirements:
- SAAS responsive website
- Quick signup form
- 7-day trial
- One-Time Password (OTP) authentication
- Muti calender syncing/linking

- WhatsApp Bot
- Easy installation
- Voice and text recognition
- Add, edit, delete calendar events
- Multi-calendar support

- Robust testing and error handling

Ideal Skills & Experience:
- Experience in developing SaaS applications
- Proficiency in WhatsApp Bot development
- Strong background in AI, especially in voice and text recognition
- Familiarity with calendar integrations (Google, iOS, Outlook)
- Capable of implementing secure OTP authentication

Please quote "WhatsApp" in your first line, and include timelines and cost estimates. Must be English-speaking, available ASAP, and open to video calls.