Retail is the process of selling consumer goods or services to customers through multiple channels of distribution to earn a profit. The term “retailer” is typically applied where a service provider fills the small orders of many individuals, who are end-users, rather than large orders of a small number of wholesale, corporate or government clientele. That’s why any task in this business domain is much more complicated. Everything needs to be multiplied by hundred thousands, millions, and billions. Developers involved in such projects have to think not only about functionality but also about efficiency. Indeed, when even a simple operation is performed millions of times per second, it can demand exceptional resources. During our work, we have gained considerable experience in supporting retail projects. We automated huge chains of hardware, specialized equipment, and grocery retail stores. We have solved tasks connected with sales support, warehouse management systems, logistics support, marketing companies (e.g., loyalty programs), etc.