Architecture Modernization Anti-Patterns: The Cost of Good Intentions

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" summary

Two real client rebuilds show carefully planned modernizations fail from misaligned intentions: a 30-year retail stack with 10,000 employees spends three years on a greenfield API-first rewrite that fragments into a distributed monolith because microservices replace modularity; an acquired retailer runs a year of "100% tech‑debt" sprints (then 70%) and floods the org with Kafka and CQRS patterns that nobody consumes. Remedies: apply Strangler Fig incrementally, set context maps, add quality gates and an architecture review board — test coverage rises to ~80–90% and reliability recovers.

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" chapters (20)

1. 0:00Introduction and defining legacy code (Michael Feathers)
2. 1:19The five questions this talk answers
3. 2:07Client story 1: the global pre-loved retailer
4. 3:30The greenfield, API-first strategy
5. 5:28Where it broke: product design vs. microservices
6. 8:47Why microservices aren't the same as modular
7. 9:49The Strangler Fig pattern (Martin Fowler)
8. 13:02Refactor vs. rearchitect vs. rewrite: how to decide
9. 17:58Client story 2: the acquired retailer
10. 19:47The 100% tech-debt sprint that failed
11. 23:43Kafka, event-driven, and CQRS misuse
12. 25:02Anti-pattern: more patterns don't equal better architecture
13. 27:08Context Maps for defining boundaries
14. 28:50Trade-offs: monolith, microservices, EDA, CQRS + event sourcing
15. 36:17Frameworks: Team Topologies, Event Storming, ATAM
16. 39:34Decision-making under uncertainty and org readiness
17. 44:16Strategic Domain-Driven Design
18. 46:50The role of AI in architecture
19. 51:04Client outcomes and lessons
20. 53:44Conclusion: architecture is strategy expressed in code

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