Restaurant POS System Development

I'm looking for an experienced developer to create a robust point of sale system tailored for restaurants. The system should encompass:

- Order Management: Efficiently handle customer orders.
- Inventory Tracking: Monitor stock levels and manage supplies.
- Sales Reporting: Generate detailed sales reports.

Additionally, the POS must support multiple user roles with distinct permissions, including:
- Administrator: Full access to all system functionalities.
- Cashier: Process transactions and manage payments.
- Manager: Oversee operations, including order and inventory management.
- Owner: Access to reports and overall system oversight.

Ideal Skills & Experience:
- Proven experience in developing POS systems.
- Strong understanding of inventory and order management.
- Ability to implement role-based access control.
- Excellent UI/UX design skills for ease of use.
- Familiarity with restaurant operations and requirements.

Please provide examples of similar projects completed and an estimated timeline for delivery.