Strangling The Monolith: Applied Patterns & Practices From The Trenches

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" summary

A nine‑year modernization at Flixbus moves a monolith from 170k to 11.2M LOC and 12 to 175 developers into an iterative migration using a five‑step process: Wardley mapping and domain modelling, team topologies and explicit ownership, behavioral + static analysis, collaborative API design with event storming, and a Strangler facade implemented with a transactional outbox and observability (OpenTelemetry traces). The approach incrementally replaces components, keeps legacy in sync via events, and proves effective though slow and error‑prone in practice.

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" chapters (16)

1. 0:00Introduction
2. 1:56Small History Tour
3. 5:18MVC
4. 11:28Anemic Domains
5. 16:50Weak Boundary
6. 22:23Feedback Loops
7. 26:54New Path
8. 27:34FiveStep Improvement Process
9. 31:04Wadley Mapping
10. 38:57Team Topologies Domain Driven Design
11. 42:08InverseConvey maneuver
12. 49:48Static code analysis
13. 53:49Collaborative Discovery
14. 55:01Trace Use Case Entry Points
15. 56:27Rich Models
16. 57:10Strength

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