An Iraqi shop used to write its customers' debts in a paper notebook. The notebook became an app on the computer and the phone: it keeps every debt and its due date, reminds the customer on WhatsApp, and understands an order the way the shop owner types it, in his own dialect.
It has an inventory, a cashier that reads barcodes, and an assistant that understands “how much does Abu Ali still owe?” — and it keeps working when the internet drops. The web and Android versions share one logic guarded by 237 test files, and the app runs every day in a real shop.
