Need a android app expert who will implement a apps

I am looking for an Android app expert who can implement an app with the following features:
- Login and registration functionality
- In-app automatically functionality work

The app should be developed specifically for the Android platform.

I already have a design in mind for the app, so the ideal candidate should be able to work with my design and bring it to life. However, I am also open to suggestions and ideas.

Skills and experience required for this project:
- Strong proficiency in Android development
- Experience with implementing login and registration functionality
- Ability to work with a pre-existing design and bring it to life

If you have the necessary skills and experience, please submit your proposal along with examples of your previous Android app development work.