I will build your cross platform mobile app using kotlin multiplatform

J
jmieczkowski
J
jmieczkowski
Josh
build your cross platform mobile app using kotlin multiplatform
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build your cross platform mobile app using kotlin multiplatform
Full Screen
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build your cross platform mobile app using kotlin multiplatformbuild your cross platform mobile app using kotlin multiplatformbuild your cross platform mobile app using kotlin multiplatform

About this gig

Looking for a skilled Kotlin Multiplatform (KMP) developer to build your next mobile app? You're in the right place.


I'm a Senior Android Developer with 12+ years of experience, specializing in KMP to deliver shared codebases that run natively on Android and iOS without sacrificing performance or user experience.


What I can build for you:

  • Shared business logic (networking, data models, repositories)
  • Full Android + iOS apps with native UI using Compose Multiplatform
  • Clean architecture with MVVM and dependency injection
  • REST/GraphQL API integration


Why KMP over Flutter or React Native? KMP lets you share logic while keeping truly native UI on each platform. No compromises, no bridge overhead just clean Kotlin code your team can maintain long-term.


Why hire me?

  • Shipped Android apps at Redfin, Providence, Navan, and U-Haul
  • Cut CI build times by 50% and improved app startup by 10% at scale
  • I write clean, testable, documented code not throwaway freelance work


Message me before ordering if you have questions about scope I'm happy to talk through your project.

  • App type

    • Native

  • Programming language

    • Kotlin

  • Frameworks

    • Jetpack Compose
    • Jetpack Compose Multiplatform

  • Purpose

    • Chat
    • Dating
    • Delivery
    • Shopping
    • Finance
    • Health & fitness
    • Maps & navigation
    • IoT
    • Travel
    • Trading

  • Tools

    • Android Studio
    • Xcode

  • Expertise

    • Cross browser/Device compatibility
    • Localization
    • Performance
    • Design

Get to know Josh

Josh

Senior Mobile Developer

  • FromUnited States
  • Member sinceMay 2026
  • Avg. response time1 hour

  • Languages

    English
Senior Mobile Developer with 12+ years shipping production apps. I specialize in native Android (Kotlin, Jetpack Compose) and cross-platform development with Kotlin Multiplatform (KMP). I've led architecture migrations, modernized legacy codebases, and improved app performance across healthcare, real estate, and travel industries. Whether you need a new app built, an existing one modernized, or architecture guidance — I deliver clean, testable, production-ready code.

My Portfolio

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