Mobile App AI Companion Setup

I need an experienced developer to set up a custom API for an AI companion integrated into a mobile app. The primary functionality will be a chatbot for user interactions.

Key requirements:
- Integrate with a mobile app
- Set up a chatbot for user interactions
- Custom API development
- Experience with AI engines (Dialogflow, IBM Watson, Microsoft Bot Framework preferred)

Ideal Skills:
- Mobile app development
- API development and integration
- Experience with AI chatbots
- Strong programming skills in relevant languages