Customer-Centric Wholesale App Development

I'm seeking a skilled developer to create a wholesale app focused primarily on Customer Relationship Management (CRM). The app should facilitate communication with clients while also streamlining our wholesale operations.

we want something our customers ( wholesale) can order off, something where we can also have access to 6 differing customer prices, so unique log in and something where they can order from. with Orders coming thru to our email or related accounting software.

Key components of the project include:
- Automated Invoicing: The app needs to incorporate an order management system with a feature for automated invoicing. This should minimize manual work and reduce the chance of human error in our billing process.
- Multi-user Roles: The app must support different user roles. These include an Admin, who will oversee the app's operations, a Sales Representative, who will use the app to track and manage customer interactions and orders, and the Customer, who will use the app to place orders and interact with our sales team.

Ideal Skills and Experience:
- Proficiency in CRM software development.
- Experience in creating multi-user role applications.
- Expertise in integrating automated invoicing systems into apps.
- Strong understanding of wholesale operations and order management systems.
- Excellent communication skills for effective collaboration.

This app should not only enhance our customer relationships but also streamline our order management process. Please include relevant samples of your previous work in your proposal.