In this book, the Chief Architect of the Cloud Native Competence Architecture Department at Sberbank shares his knowledge and experience with the reader on the creation and transition to the cloud ecosystem, as well as the creation and adaptation of applications for it. In the book, the author tries to lead the reader along the path, bypassing mistakes and difficulties. To do this, practical applications are demonstrated and explained so that the reader can use them as instructions for educational and work purposes. The reader can be both developers of different levels and ecosystem specialists who wish not to lose the relevance of their skills in an already changed world.