Point of Sale and Inventory Modules of a multi-faceted program I've already designed and completed front end interface

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Job Description

Hi! I'm building a point of sale software for a local shop. Already made the design and made the front end interface using Boostrap.
We have several modules:
-Point of Sale

I have already gotten a developer for Service module and am working on integrating their work into the system.
However, I'm looking for somebody to build Point of Sale and Inventory Modules. Looking for somebody proficient in PHP and MySQLi who can get this done fast and with good code.