Kotlin to 93%: Four Languages with Compose Multiplatform at Sony…
summary
A Kotlin-heavy rewrite at Sony consolidated a four-language codebase (Kotlin, TypeScript, Objective-C, Swift) into a single Compose Multiplatform + Kotlin Multiplatform codebase, raising Kotlin share to 93.7% and shipping global Sound Connect features from one repository. The work includes a BLE high-frequency sensor pipeline, real-time behavior inference, Jetpack Compose/CMP UI, a J2ObjC legacy bridge, and a tiny 0.2% SharedKernel boundary to avoid full rewrites; delivery used two-week timeboxed spikes with native fallbacks, and a six-engineer team maintained the shipped product to win an iF Design Award.
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chapters (19)
- 0:00Kotlin 93% migration strategy
- 1:19Autoplay features and use cases
- 3:32Why Compose Multiplatform
- 5:39Multiplatform challenges
- 7:05Technical risks
- 9:30Safe release ideas
- 13:27Time-boxed experiments
- 17:27Memory model fixes
- 20:41Main thread usage
- 22:32Bluetooth demo
- 24:56Two apps integration
- 26:45Compose experiments and evaluation
- 28:58Accessibility fixes
- 31:12Church pattern integration
- 33:46Post-integration demo
- 37:24Three lessons and results
- 38:27Kotlin 94% migration results
- 40:38Awards and future outlook
- 41:41Start small grow big
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