The subject of the public contract is the development and technical support of the ASEO application. The aim of the event is the development of the ASEO system, where the main task is the re-design and further development of current clients or components, further development of European authentication and authorization according to Uniform User Management and Digital Signatures environment, which provides user authentication and authorization at the European level - UUM & DS and which form the ASEO system, in connection with the requirements of the European Commission, new national legislation, including new operational and safety requirements. The goal of the development is also the creation of a portal solution for the national permit for Customs Decisions and the creation of the CS CR Notification Center, which will be connected to the primary systems and the modification of existing components that will need to be modified before migration. The subject of the public contract is defined in more detail in the ZD and in the annexes to the ZD.