Android Utility Mobile App Development

I'm looking for an experienced mobile app developer to create a utility-focused Android app. The project requires:

- Comprehensive understanding of Android OS
- Expertise in mobile app development
- Prior experience with utility apps
- Ability to deliver high-quality, user-friendly applications
- Mechanical knowledge would be a bonus
- Its a Drawings type Application, Lines, Labels etc

Please provide examples of similar projects you've completed.