Since November 2015, ING Bank in Poland has been offering a new Internet banking system, which (according to customers) is simple, intuitive and mobile friendly, and which supports the management of their daily finances. The System, which has been giving Bank access to millions of transactions is now a basis to improve its big data management as well as to launch friendly, successful communication to its 4 million plus customers in channels and ways preferred by them. My ING is built on the basis of a detailed analysis of the needs of customers. Since the beginning of the project, the Bank has been testing, on an unprecedented (even in Poland) scale, the usability of the system. ING is eager to present some of the most interesting observations/conclusions from testing Moje ING.