DDD Surrounded by Legacy, Govt Edition
summary
A cross-functional team prototypes a cloud adjudication path that processes four million claims per night without touching the legacy core of three million lines of COBOL. The result is the Modular Cloud Adjudication Prototype (MCAP): a six-month proof of concept spanning five monoliths, half a dozen flat files and 100 pages of regulation, using anti‑corruption layers, EDI → temporal APIs, federated GraphQL, event-driven orchestration and bulk file output to interoperate with existing systems. The prototype works as a realistic demo of policy change and incremental modernization.
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chapters (11)
- 0:00Introduction and context
- 3:25Government vs commercial software
- 8:24Legacy systems in government
- 15:12DDD for legacy modernization
- 22:22Medicare domains and challenges
- 27:20Shared systems at CMS
- 33:20Social-technical challenges
- 36:09Prototype MCAP and goals
- 41:03Event storming and realistic use case
- 48:27Future state and takeaways
- 50:36Modernization efforts and conclusion
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