Part 4 3 chapters

Finding the Seams

Strategic + tactical DDD, hexagonal, event storming, coupling theory, modular monolith / decomposed DBs — deciding where to cut.

Chapter 11

Strategic & Tactical DDD + Hexagonal

Subdomains, bounded contexts, context mapping, aggregates, and domain events — keeping protocols out of the domain core so extraction is mechanical.

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Chapter 12

Event Storming the Monolith

Discovering seams from behavior, not schema; the decomposition backlog this produces, run as an ADLC reconnaissance step.

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Chapter 13

Coupling, the Modular Monolith & When Not to Split

Khononov's three dimensions of coupling; the modular monolith and decomposed-DB monolith as legitimate destinations; the distributed-monolith trap.

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