WhatsApp API & AI Bot Development

I'm seeking an experienced developer to create a WhatsApp API bot integrated with AI capabilities. The bot's primary role will be customer support, but it will also assist in lead generation, customer engagement, and running promotional campaigns.

Key Requirements:
- Develop a WhatsApp bot using WhatsApp API.
- Implement AI for contextual, dynamic responses.
- Set up customer support functionalities.
- Integrate sales and marketing functions:
- Lead generation
- Customer engagement
- Promotional campaigns

Ideal Skills and Experience:
- Proficiency in WhatsApp API.
- Strong background in AI and bot development.
- Experience in customer support systems.
- Knowledge of sales and marketing automation.

Please provide examples of similar work done.