Kotlin Multiplatform Sharing Logic Without Losing Native Power

My Experience with Kotlin Multiplatform in 2025 — What’s Stable, What’s Not, and What I’ve Learned

Over the last few months, I’ve been working on a full-stack project using Kotlin Multiplatform (KMP). I wanted to build something that works across Android, iOS, Web, and even Desktop — but without rewriting everything again and again.

Honestly, it hasn’t been a smooth ride from the start — but with the right structure and tools, I’ve seen how powerful KMP as well ad CMP can really be.

Here’s what I’ve learned so far 👇

💡 What is Kotlin Multiplatform (KMP)?

KMP lets you write your app’s business logic (network calls, database, state, etc.) once in Kotlin, and reuse that across multiple platforms.

So instead of building your logic again in Swift, JavaScript, or another language — you share it. Then, you still use native UI for each platform like:

• Jetpack Compose for Android

• SwiftUI for iOS

• Web (with Kotlin/JS or Kotlin/Wasm)

It’s not trying to replace native code — it just helps you avoid duplicating everything.

✅ What’s Stable in 2025?

Here’s the current state of KMP (as of mid-2025):

Platform KMP Support Compose Multiplatform Android✅ Stable✅ Stable iOS (Swift interop)✅ Stable✅ Stable Desktop (JVM)✅ Stable✅ Stable Web (JS)✅ Stable⚠️ Alpha Web (Wasm)⚠️ Alpha⚠️ Alpha watch OS / tv OS🔄 Beta🔄 Beta

So if your focus is Android + iOS + Desktop, KMP is ready. Web is still growing but usable for some cases.

How I Set Up My KMP Project

Here’s how I structured it:

• Shared Kotlin Code

• Android: Jetpack Compose + Room

• iOS: Swift UI + shared logic via XC Framework

• Web: Started experimenting with Kotlin/JS

• Backend: FastAPI(api framework) + MongoDB + Supabase it's a cloud based DB you can choose another DB

• CI/CD: GitHub + Jenkins + Docker + KIND cluster

• Monitoring: Loki + Grafana

• Infra: Oracle Cloud with 1 master + 3 worker nodes

• Security: Cloudflare + NGINX (round-robin)

⚙️ Tools That Helped Me (MCP Server + AI in IDE)

Working with KMP also brought in problems like:

• Import errors

• IDE showing "Unresolved reference"

• Gradle sync not working

• Confusing folder structures

To fix this, I used:

🔹 MCP Server Helps track folder issues, checks if modules are set correctly, and flags platform mismatches in real-time.

🔹 AI Plugin inside Android Studio Auto-suggests correct imports, fixes broken dependencies, even helps in expect/actual mapping.

Result? I spend less time debugging, and more time building features.

✅ What’s Working Great

• One codebase for logic

• Easy to test shared code

• Fast development with Jetpack Compose and SwiftUI

• Teams can stay focused on their platform's UI

• Great for projects that need native experience + logic reuse

⚠️ What’s Still a Bit Tricky

• CocoaPods + Xcode setup still needs care

• Gradle sync can be slow for multiplatform projects

• Web is still not fully stable (but improving)

• iOS debugging sometimes needs Android Studio + Xcode open together

• and the last thing you can't be run IOS emulator on window because its's not supported by window

🔮 What I Want to See Improved

• Better Wasm support for Web

• One-click multiplatform debugging

• Faster sync/build times

• Improved plugin experience for iOS teams

Final Thoughts

Kotlin Multiplatform isn’t a shortcut — it’s a smarter way to scale across platforms. It’s especially great for teams who:

• Want to keep native UI

• Share logic cleanly

• Avoid repeating business rules on every platform

With tools like MCP Server and AI-based IDE support, KMP is now faster, cleaner, and easier to manage.

If you’re working on any shared logic, I definitely recommend giving KMP a serious look — it’s more than just an experimental tool in 2025.

💬 Are you using KMP or planning to try it soon? Would love to hear your thoughts or any tips you’ve discovered!

#KotlinMultiplatform #KMP #AndroidDev #iOSDev #ComposeMultiplatform #CrossPlatform #Jetbrains #DeveloperTools #MCPServer #MobileArchitecture #KMM #DevExperience #LogicSharing