Kotlin Multiplatform is no longer “experimental curiosity” — it’s a serious choice for production apps.

Companies like Netflix, Cash App, and McDonald's are already using it to share business logic across platforms while keeping native UI experiences intact ( LevnTech ).

In this post, I’ll walk through how I built a production-ready Kotlin Multiplatform SDK that works seamlessly across Android and iOS — along with the real challenges, trade-offs, and lessons learned.

🤔 Why Kotlin Multiplatform?

Unlike Flutter or React Native, Kotlin Multiplatform doesn’t try to replace native development.

Instead, it lets you:

Share business logic (networking, caching, models)

Keep native UI (Jetpack Compose / SwiftUI)

Avoid code duplication

Maintain near-native performance

This approach is powerful because you’re not forced into an “all-or-nothing” architecture — you can adopt it gradually ( InfoQ ).

🧱 Project Architecture

A typical KMP setup looks like this:

Android App → Uses shared module

iOS App →…