Kotlin Multiplatform's Cross-Platform at Norway's 377-Year-Old Postal Service
summary
Posten Bring extracts hundreds of fragmented business rules from legacy services into a shared Kotlin Multiplatform library that compiles to a JVM artifact for backends and an npm/JS artifact for front ends, running in production since 2021. The team centralizes validation and serialization, publishes live rule docs, and lets product owners open PRs against rules; challenges include JS bundle bloat (mitigated with Webpack 5) and ongoing cleanup of legacy cases.
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chapters (9)
- 0:00Introduction and context
- 1:27Problem with fragmented business rules
- 6:25Goals and developer happiness
- 7:30Early refactoring efforts
- 8:34What is Kotlin Multiplatform
- 10:43Flexibility of KMP
- 13:55KMP project structure
- 17:43Code implementation and demo
- 21:35Results and insights
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