Kotlin Multiplatform at Scale: Stone's Journey to 61% Code Sharing
Original post Two Years with Kotlin Multiplatform: From Zero to 55% Shared Code
Article Summary
Rodrigo Sicarelli from StoneCo reveals how one of Latin America's largest fintechs went from zero to 55% shared code across iOS and Android in just two years. Serving 4 million users, they bet big on Kotlin Multiplatform.
StoneCo, a major Brazilian fintech, adopted Kotlin Multiplatform to unify their mobile development across two large-scale apps. This KotlinConf 2025 talk shares their complete journey: from evaluating cross-platform frameworks to training 130 engineers and measuring real-world impact on productivity and performance.
Key Takeaways
- Achieved 55% code sharing between iOS and Android apps in 24 months
- Trained 130 mobile engineers to adopt the new paradigm
- Balanced code efficiency with fintech-grade user experience requirements
- Measured tangible gains in team productivity and developer satisfaction
A fintech serving 4 million users successfully scaled Kotlin Multiplatform to 55% shared code while maintaining the seamless experience financial apps demand.
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Oct 24, 2025
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This page summarizes “Two Years with Kotlin Multiplatform: From Zero to 55% Shared Code” by Stone, published Sep 9, 2025. All credit for the original work goes to the authors.
