Android-Sales & Billing App Development

I'm looking for an Android-based mobile billing application designed for efficient management of sales and financial activities. The app should incorporate features like daily sales collection, reporting, dashboard, and invoice printing.

Key Features of the Application
- User Authentication and Role Management:
- A secure login system with Admin and Salesperson roles
- Role-based access control to ensure data security and appropriate access levels
- Dashboard:
- An overview of daily sales, total revenue, outstanding payments, etc.
- Visualization of key metrics using charts and graphs

The app will be online-only, without the need for offline functionality. User authentication will be through a simple email and password system.

Ideal Skills:
- Expertise in Android app development
- Experience with implementing secure login systems and role-based access control
- Proficiency in creating interactive dashboards with data visualization techniques
- Previous work creating mobile billing applications is a plus

Your role will be to bring this vision to life, creating a valuable tool that can help streamline our sales and financial management.