# Building a Production-Ready Kotlin Multiplatform SDK (Android + iOS)

Vikas Soni — Tue, 05 May 2026 18:42:53 +0000

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 → Consumes Kotlin framework
Shared Module → Business logic

Kotlin compiles your shared code into:

A native framework for iOS
A standard module for Android

This means no bridges, no JavaScript layer — just native performance (DEV Community).

🚀 What I Built

The goal was simple:

👉 Create a production-grade SDK that:

Can be reused across apps
Is easy to integrate
Handles real-world concerns (networking, error handling, scalability)

⚙️ Key Challenges (and How I Solved Them)

1. API Design for Two Worlds

Designing an SDK that feels “native” on both Android and iOS is harder than it sounds.

Solution:

Keep APIs minimal and platform-agnostic
Use expect/actual wisely
Avoid leaking platform-specific abstractions

2. Dependency Management

Not all libraries are multiplatform-ready.

Solution:

Prefer KMP-compatible libraries (e.g., Ktor)
Abstract dependencies behind interfaces

3. iOS Interoperability

Swift + Kotlin interop can get tricky.

Solution:

Design Swift-friendly APIs
Avoid overly complex generics
Test from Xcode early, not later

4. Build & CI Complexity

KMP builds can become slow and complex.

Solution:

Optimize Gradle configuration
Separate concerns into modules
Cache aggressively in CI

🧪 Production Learnings

After taking this setup closer to production, a few things stood out:

You can realistically share 70–80% of business logic
Debugging is manageable with standard tools
The biggest gains come from team alignment, not just code reuse

📦 When Should You Use KMP?

Kotlin Multiplatform is a great fit if:

✅ You have both Android and iOS apps
✅ Your business logic is complex and shared
✅ You want native UI but shared architecture

Avoid it if:
❌ Your app is UI-heavy with little shared logic
❌ Your team lacks Kotlin experience

💡 Final Thoughts

Kotlin Multiplatform hits a sweet spot:

Not a full abstraction layer
Not fully separate codebases

It gives you shared logic where it matters, without sacrificing native quality.

If you're building something meant to scale across platforms, it’s absolutely worth considering.

🔗 Full Article

If you want the complete deep dive with implementation details, check it out here:

👉 https://medium.com/proandroiddev/building-a-production-ready-kotlin-multiplatform-sdk-for-android-ios-0044cd5d1baf

🙌 Feedback

If you're working with Kotlin Multiplatform or planning to, I’d love to hear your experience.

What’s been your biggest challenge so far?

DEV Community: Vikas Soni

# Building a Production-Ready Kotlin Multiplatform SDK (Android + iOS)

🤔 Why Kotlin Multiplatform?

🧱 Project Architecture

🚀 What I Built

⚙️ Key Challenges (and How I Solved Them)

1. API Design for Two Worlds

2. Dependency Management

3. iOS Interoperability

4. Build & CI Complexity

🧪 Production Learnings

📦 When Should You Use KMP?

💡 Final Thoughts

🔗 Full Article

🙌 Feedback