Why off-the-shelf POS software often falls short
Most point-of-sale systems are built for the average retailer, not your specific operation. A supermarket has different needs than a boutique — perishable inventory, supplier-specific pricing, and staff who need the interface to be fast, not fancy.
Starting with the data model
Every POS system I've built starts with three core tables: Products, Transactions, and InventoryLog. Getting this right early saves you from painful migrations later.