Android Inventory Management App Development

I need an Android inventory management app with the following features:

Key Features:
- Real-time stock updates
- Reporting and analytics
- Stock in/out tracking
- Purchase and sale orders
- Multi-user functionality
- Expense tracking for labor and logistics
- Basic invoice generation

User Roles:
- Admin
- Manager
- Employee

Ideal Skills and Experience:
- Android app development expertise
- Experience with real-time data synchronization
- Strong background in reporting and analytics tools
- Familiarity with multi-user app architecture
- Knowledge of expense tracking and invoicing systems
- UI/UX design skills for user-friendly interfaces

Looking for a developer who can deliver a robust, scalable, and intuitive app.