Focus Timer App Development

I'm looking for an experienced app developer to create an application similar to Focus Friend by Hank Green. The app should be developed for both iOS and Android platforms.

Core Features:
- Focus timer
- Library feature where users can add books, matching their personal library

Ideal Skills and Experience:
- Proficiency in both iOS and Android app development
- Experience in building timer and library functionalities
- Strong UI/UX design skills for a user-friendly interface
- Ability to provide detailed project proposals

Please include relevant past work and experience in your application.