The paper presents an analysis of approaches to building an architecture system for service companies. A brief review of the subject area is made; the problems of such companies are identified. The article substantiates that the problem of choosing the software complex architecture is multi-criteria in nature. The main variants of the software package architecture are introduced, for which their advantages and disadvantages are identified and analysed, and the criteria for their evaluation are described. To solve the problem of multi-criteria optimisation, a weighted convolution method of the “distance to ideal” type is chosen. As a result, it is found that the most suitable software architecture for service companies is EAM-system with the developed Service Desk subsystem and flexible integration with external Service Desk systems to expand functionality in appropriate cases