All Our Aggregates Are Wrong

Explore the complexities of e-commerce system design in this 58-minute conference talk from NDC Conferences. Delve into the challenges of implementing a seemingly straightforward shopping cart feature, and discover how evolving requirements can lead to problematic technical shortcuts. Analyze the impact of complex use-cases on overall design, and learn how to focus on business needs to guide the correct approach. Gain insights into decomposing requirements, building the right software, and implementing effective solutions such as view model composition and vertical slices. Walk away with a new understanding of how to tackle complex e-commerce systems and avoid common pitfalls in aggregate design.

Intro
Buy a "Banana Protector"
Sounds like a nice looking aggregate
However, availability changes over time
Business requirements (#3)
It's becoming messy, isn't it?
Can we get rid of all this coupling?
Let's decompose the Shopping Cart
Marketing tends to be stable
We followed the coupling
Can Read Models be a solution?
We cannot cache everything
Shared identifiers
View Model Composition (flow)
Sales Product Requests Handler
Sales Request matching
Sales Composition
View Model Decomposition
Shipping Request Matching
Shipping Decomposition
Shipping Error Handling
Full Vertical Slices
Services communication channel
The final big picture