Building KMP Libraries: The RevenueCat Story

Sebastian and Márton discuss building KMP libraries with Jay Shortway, the author of RevenueCat’s Kotlin Multiplatform SDK for in-app purchases. Resources: RevenueCat KMP SDK How we built the RevenueCat SDK for Kotlin Multiplatform Hybrid SDK Architecture at RevenueCat ttypic/swift-klib-plugin on GitHub RevenueCat/purchases-kmp on GitHub Consider moving `Instant` and `Clock` to the standard library · Kotlin/kotlinx-datetime RevenueCat openings Hosts: Sebastian Aigner – Website | Bluesky Márton Braun – Website | Bluesky Guest: Joop Korteweg – Twitter Timeline: (0:00) Intro (0:44) What’s RevenueCat (4:00) In-app purchases are hard (7:22) The multiplatform SDK (12:44) The demand for KMP (16:30) Hiring and team structure (18:42) SDKs for any framework (21:27) Building on native SDKs (23:45) Improving iOS linking (24:54) The SDK is on GitHub (26:05) Benefits of building on native (28:18) Designing a common API (33:21) Add-on modules for SDKs (37:30) Instant in the standard library (38:04) Returning results from the API (39:53) API design decisions (44:57) Codegen opportunities (45:48) The best things about KMP (47:07) KMP improvements wishlist (48:28) The KMP journey (49:45) Wrap-up