pos app touch pos compatible

I'm looking for an experienced software developer to create a touch POS compatible mobile and desktop application. I don't have an existing POS system, rather, I need a custom app built from the ground up with features tailored to my needs. This app needs to be integrated with a touch POS system, as that seems to be the most effective ways to manage and track various aspects of a business. My aim is to reduce admin pressure, increase customer convenience, and drive profitability with a more efficient sales process. As such, I'm relying on the developer to help me select the right set of features that are best tailored to a touch POS environment and those which would serve my particular needs. Thanks for your interest!