Hi Albert,

I have implemented a demo here, the code is in PHP7 but fully OOP thus you can easily get the ideas even if you're not a PHP developer. https://github.com/anhchienhoang/sf4-cqrs-es-demo

In terms of bounded contexts, in my opinion, I believe it must be started from your core domain, for example, the eCommerce domain and you will need a domain expert to work with you on defining the sub-domains/components for instance: Catalog/Payment/Checkout/Shopping Cart... Based on this, you can perform the context mapping session to identity the dependencies then what is the best structure for your services/teams later.