Interactive Language Learning App Development

I need a skilled app developer to create an engaging and interactive language learning application, primarily focused on delivering interactive lessons.

Key Requirements:
- Development for iOS and Android platforms
- Incorporation of API for additional functionalities and future upgrades

Skills and Experience:
- Proven track record in interactive app development
- Expertise in iOS and Android app development
- Prior experience with language learning apps is a plus
- Proficiency in API integration