I’m a Typescript dev but this book is one of my favorite architecture books, I reference it all the time. My favorite pattern is the fake unit of work/service patterns for testing, I use this religiously in all my projects for faking (not mocking!!) third party services. It also helped me with dilemmas around naming, eg it recommends naming events in a very domain specific way rather than infrastructure or pattern specific way (eg CART_ITEM_BECAME_UNAVAILABLE is better than USER_NOTIFICATION). Some of these things are obvious but tedious to explain to teammates, so the fact that cosmic python is fully online makes it really easy to link to. Overall, a fantastic and formative resource for me!