Kotlin Multiplatform development services for apps that share code without losing native feel.

Kotlin Multiplatform lets you write the parts of an app that don't need to look different per platform — networking, data models, persistence, business rules, validation — once, in Kotlin, and reuse that module on Android, iOS, and desktop. The UI stays separate: Jetpack Compose on Android, SwiftUI (or Compose Multiplatform) on iOS, and whatever fits the desktop target.

That split matters. The apps that regret going multiplatform are usually the ones that tried to share UI code before the underlying logic was solid, or shared things — like screen-specific state — that should have stayed platform-native. My default is to share the boring, high-value layer first: API clients, local database access with SQLDelight, caching, and domain logic. UI comes later, and only where it earns its keep.

The honest pitch for KMP is narrower than the marketing around it: it pays off when your Android and iOS apps do genuinely similar things — same data model, same business rules, same backend — and you want to fix a bug or ship a feature once instead of twice. It pays off less when the platforms diverge heavily in behavior, or when you only ever plan to ship one of them.

A useful signal: if you already have a native Android app and are scoping an iOS version, the shared module is usually where the estimate drops the most — the logic that took weeks to get right on Android does not need to be re-derived on iOS, just re-wired to a Swift UI layer.

The process is the same shape as any build here — scope, architect, build, ship, maintain — with the architecture step doing more work up front for multiplatform projects, because the shared/platform-specific boundary has to be right before the codebase grows around it.

Most KMP work I do is not a greenfield rewrite — it is an existing native Android app that needs an iOS counterpart, or two separate native codebases that have drifted and need a shared source of truth. The practical path is incremental: extract the networking and data layer into a Kotlin module first, prove it works on both platforms, then move business logic module by module. Rewriting the UI layer in one shot is rarely worth the risk; native UI code usually stays as it is.

Kotlin Multiplatform on its own only shares logic — the UI stays native per platform. If you also want the interface itself shared across desktop and mobile, that is a further step covered on the Compose Multiplatform development page linked below, and it is a different set of tradeoffs worth reading before committing to it.