Keep IT clean: mid-sized building blocks and hexagonal architecture
summary
Allegro runs ~550 microservices, 13.5k requests/sec, 90 deployments/day and uses Java + Spring; the concrete claim is that using package-private as default to make mid-sized packages single-entry modules yields easier refactoring and fast tests. The build uses ports-and-adapters / hexagonal architecture, CQRS for separate read models, and in-memory repositories for module-level unit tests that run in milliseconds so 90% of behavior can be verified quickly while integration tests cover only wiring and IO.
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chapters (10)
- 0:00Introduction and speaker background
- 2:01Complexity and software building blocks
- 12:24Why package scope matters
- 16:54Public as published API
- 17:14Article module example
- 28:34Hexagonal architecture explained
- 32:09Test-driven development with modules
- 43:15Java modules vs packages
- 46:26Q&A on testing and Spring Boot
- 49:14Applying to large applications
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