The book is devoted to the in-depth study of the creation, optimization and support of applied solutions on the platform of the system "1C: Enterprise 8. 2. They consider the architecture of the system and application solutions, describe the structure and implementation of application mechanisms. Considerable attention is paid to the organization of data storage and ensuring the effective operation of application solutions. Methodical approaches to the creation and support of applied solutions are also described, the mechanisms of the system that are used to implement these tasks are considered. The book is designed for developers who have some skill in creating and modifying application solutions in the 1C:Enterprise 8 system and who want to improve their professional level. The book will also be of interest to IT specialists who are not engaged in development, but want to get an idea about the capabilities of the system, its ideology, architecture and the implementation of specific mechanisms.