A Journey in Shared Code with Kotlin Multiplatform

on YouTube ↗42m

" summary

Quizlet ports its grading “secret sauce” from JS into Kotlin Multiplatform, runs artifacts on JVM, JS, and native, and ships shared libraries to Android, iOS, and web for 50 million monthly users. Early approach uses J2V8 and JavaScriptCore wrappers; migration cuts APK size and app launch time, reduces Android grader load by ~1.5s, and produces a 30 KB bundle after dead-code elimination. Correctness is validated by running Kotlin JS/JVM artifacts against 16 million submissions in BigQuery; performance on web is ~3x slower but still millisecond-fast.

AI-written summary · about

" chapters (12)

1. 0:00Introduction to journey
2. 2:17Quizlet's early days
3. 7:54Challenges with mobile apps
4. 12:10Early shared code attempts
5. 17:51Kotlin Multiplatform introduction
6. 21:20Testing shared Kotlin code
7. 25:38Android performance results
8. 27:23Web integration struggles
9. 34:20iOS implementation details
10. 36:02Full Kotlin Multiplatform adoption
11. 38:29Modern Kotlin Multiplatform
12. 40:55Key takeaways and Q&A

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