I made a point of sale for a company in Bosnia that needed very custom features so it fits in their processes. It is made using local self-hosted Appsmith instance so it can access the in-house servers which host the inventory data in an internal SQL database. Appsmith is a low code tool that speeds up creation of the user interface useful for enterprise applications where you don't need a custom design. This let me significantly reduce the cost of frontend development and focus on developing and testing features that were needed. The app also interacts with local fiscal printers to issue legally required fiscal invoices.

Also I created a side app for Zebra barcode readers (done in Retool) that lets employees quickly check stock levels and adjust inventory.