Multi-Language Learning App with Chatbots

I'm seeking an experienced app developer to create a language learning app focused on conversation practice using automated chatbots.

Key Requirements:
- Primary feature: Conversation practice via automated chatbots
- Languages: English plus 10-12 additional languages (to be determined)

Ideal Skills and Experience:
- Expertise in mobile app development
- Experience with chatbot integration
- Knowledge of language learning methodologies
- Familiarity with multi-language support in apps

Please share previous relevant work and ensure a user-friendly interface.