Mobile App Development

I am looking for a mobile app developer to create an app for both iOS and Android platforms. The main purpose of the app is to enhance productivity. While I have a few specific features in mind, I am open to suggestions and would appreciate the expertise of the developer in this area.

Ideal Skills and Experience:
- Proficiency in iOS and Android app development
- Experience in developing productivity-focused apps
- Ability to collaborate and provide suggestions for additional features or functionalities
- React Native
- Login / Registration and Subscription based pricing