Summary

In this chapter, we learned how to define architectural boundaries that enable change. The key is understanding that people (that is, actors) are the source of change and then aligning our boundaries along these axes of change. We found that event-first thinking, with its focus on verbs and facts, naturally helps us with this alignment.We brought this all together to divide a system into autonomous subsystems, and these into autonomous services. We saw how we can create arbitrarily complex systems following this simple fractal pattern of autonomous components. Then, we dissected the anatomy of autonomous services and learned how to leverage observability and automation to govern without impeding innovation.In the next chapter, we will start digging into the details of our architecture. We will learn how the micro frontend approach, along with other new techniques, helps to bring the seemingly endless churn at the presentation layer under control.