CashOrCard is a tablet based Point of Sale app for retail. It enables merchants to connect their web shop with the tablet importing seamless all the existing products to the app. It connects the tablet to the payment provider, receipt printer, and the cash register. It works for both iOS and Android platforms. Some of the features are: customize products, email receipts to the customer, brand receipt customization, partial payments, split payment, customer profile, transactions report, simultaneous sales, and others. My work on this project was to design it from scratch following business requirements. The process usually consisted of sketching, prototyping, customer interviewing, data analysis, designing and constant iteration.