John Phamvan at DDD Europe 2025
summary
A cross functional team modernizes parts of the US health‑care claims system that processes 4 million claims per night and runs on three million lines of COBOL. No coherent data model exists, so the team adopts the big blue book (Evans' DDD PDF) as a tool to surface domain concepts, map bounded contexts, and drive collaborative discovery between researchers, designers, developers and service designers, enabling them to untangle models and make incremental, testable replacements.
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