Android Data Collection & Management System

I'm looking for a skilled developer to create a field collection and accounting management system for Android. The system should support user role management with varying access levels.

Key Requirements:
- Platforms: Android
- User Role Management: Yes, different roles with varying access levels
- Field Collection Features:
- Offline data collection
- Automated data synchronization

Ideal Skills and Experience:
- Mobile app development, particularly on Android
- Experience with user role management systems
- Expertise in offline data collection and synchronization techniques

Please provide examples of similar projects completed.