Comprehensive SaaS WhatsApp API Development

I'm looking for a skilled developer to create a SaaS WhatsApp API solution that can both send and receive messages.

Essential Features:
- Message scheduling
- Automated responses
- Analytics and reporting
- Lead management
- Integrations with other platforms

Integrations Required:
- CRM systems
- E-commerce platforms
- Email marketing tools

Ideal Skills and Experience:
- Experience with WhatsApp API
- Strong background in SaaS development
- Proficiency in integrating with various platforms, especially CRMs, e-commerce, and email marketing tools
- Knowledge of analytics and reporting tools

Please provide examples of previous work and a detailed proposal.