In this talk, I will demonstrate how so-called good practices combined with a shallow understanding of the domain can create a dangerous illusion of control.

Using a real-world example from the Connected Health domain—specifically, liver cancer risk alerting—I will show how a noun-driven design approach leads to excessive coupling and brittle systems.

The talk will explore common architectural pitfalls such as context violations, database coupling, domain leakage, and mixing read and write models. I will also challenge a popular industry belief by explaining why Clean/Hexagonal Architecture is not an architecture.

Attendees will leave with a clearer understanding of how design decisions shape system behavior—and how easily “best practices” can fail when the domain is misunderstood.