Simple Wallpaper Andriod App Development

I'm looking for an experienced Android app developer to build a simple wallpaper app. The app should be compatible with both phones and tablets.

Key requirements:
- Feature static image wallpapers only.
- Provide a preloaded collection of wallpapers for users to choose from.

Ideal skills and experience:
- Proven experience in Android app development.
- Strong portfolio of similar apps.
- Familiarity with both phone and tablet UI/UX design.
- Ability to deliver within budget and timeline.

Features of App
- Simple Clean UI design.
- Organized Categories eg. Abstract, Anime, City, Nature, etc..
- Download or Set Wallpaper (Home Screen/Lock Screen).
- Search wallpapers.
- Google AdMob Integration.
- Smooth Transitions.

Need Code as well as Apk file.