The goal of this thesis is to design and implement a backend (BE) module that will be a part of the banking application. BE will offer about 45 API services related to cash operations at bank cash desks. BE will support simple CRUD operations, monitoring and logging operations, and more demanding business services such as cash withdrawal from the client account running in multiple modes. BE will work with the Postgres database and JPA repositories. Most of the logic, especially those related to database, validation, or mapping, will be located directly in BE. But some parts are already implemented in other company modules that BE calls, processes the answers, and resends to other modules. In the textual part, the student will describe the design of the CT module including relevant interconnected surrounding modules. The description will clearly and properly describe which parts were made by the student and which are using external services.