KMP · CMP · Android + iOS + Web

Kotlin Multiplatform developer

Ahsan Islam is a Kotlin Multiplatform developer who ships cross-platform products — not demo apps. Production experience with Compose Multiplatform targeting Android, iOS and WebAssembly web from one UI codebase, plus shared domain and data layers via expect/actual and Ktor.

1 KMP app on Play
10 tax countries
3 targets (A/iOS/web)
9+ yrs Kotlin

Why hire a Kotlin Multiplatform developer?

Maintaining separate Android and iOS teams doubles cost and drift. KMP shares business logic; Compose Multiplatform can share UI too. The trade-off is toolchain maturity and platform-specific edge cases — a KMP developer needs Android depth to know when sharing helps vs hurts.

Ahsan brings nine years of Android-first delivery plus hands-on KMP production: tax rule engines, Supabase-backed versioned content, Play Billing and AdMob via expect/actual, and Wasm web targets.

Shipped KMP project: Income Tax Calculator

Income Tax Calculator on Google Play — one Compose Multiplatform codebase for Android, iOS and Wasm web. Ten tax systems (PK, US, IN, UK, UAE, SA, CA, AU, DE, SG) with pluggable rule engines delivered as JSON packs from Postgres via Supabase — no app release required to update tax rules.

Salary and freelancer flows, reverse take-home calculator, raise simulator, offer comparison.
Ktor + kotlinx.serialization, Firebase Analytics/Crashlytics, Google UMP consent, Play Billing entitlements.
GitHub Actions CI for Android build, signing and unit tests per country engine.

Other KMP experience

Karachi Brand Studio — KMP retail storefront, shared browsing and product detail logic.
COFE white-label platform — Android-first; KMP patterns for shared modules where applicable.
expect/actual for platform services: billing, ads, secure storage, file pickers.

KMP developer toolkit

Kotlin Multiplatform, Compose Multiplatform, Wasm web target
Ktor client, kotlinx.serialization, SQLDelight (multiplatform)
Supabase (Postgres, Auth, PostgREST) for versioned remote config
Gradle KMP source sets, convention plugins, platform-specific CI

Declared limits

No native Swift/UIKit delivery — iOS through Compose Multiplatform only. No commercial Flutter or React Native. See FAQ.

Hire for KMP project → Full-time role Android developer profile