Kotlin Multiplatform Newsletter #10
We explore the launch of Google Summer of Code 2026 for Kotlin and dive into a technical debate on why you shouldn't start coroutine testing with Turbine. We also cover bridging StateFlow and SharedFlow for shared ViewModels, using AI to audit KMP dependency readiness, and highlight useful CMP libraries like Calf and Compose Cupertino. Plus, a look at Super Mario Bros ported to Kotlin and a Senior KMP role at Fanatics.
The Log
The only Kotlin Multiplatform and Compose Multiplatform news you actually need to know.
The Kotlin Foundation is joining Google Summer of Code (GSoC) 2026! If you are a student or an eligible contributor looking to spend your summer working on a real-world open-source project, this is your chance to make a meaningful impact on the Kotlin ecosystem while also benefiting from the mentorship of experienced engineers.
Expect Actual
Technical deep dives, or solving the "how-the-hell-do-I-test-this" problems.
Practical Kotlin Deep Dive (Jaewoong Eum) takes you beneath the surface of Kotlin, exploring not just what the language does, but how it works and why it was built that way.
From foundational concepts through coroutines, compiler architecture, and Kotlin Multiplatform, this book connects everyday coding patterns to their underlying mechanisms.
Turbine is a great testing library. It also makes it easy to write over-specified, flaky tests without realising it. Here's why you should learn coroutine testing without it first.
In this article, we’ll go from a quick recap of
StateFlow vs SharedFlow, through the KMP bridge problem, all the way to a working shared ViewModel consumed natively on both Android (Jetpack Compose) and iOS (SwiftUI). We’ll also cover the real gotchas that don’t usually make it into the docs.Before migrating an Android project to Kotlin Multiplatform, you need to answer one question: are your dependencies ready? Here's how to combine deterministic scripts with AI-powered research to check, without wasting time or money.
The Dependency Graph
Curated libraries, tools and plugins that won't break your Gradle build.
- Calf
Calf is a library that allows you to easily create adaptive UIs and access platform specific APIs with Compose Multiplatform (Adaptive UI, File Picker, WebView, Permissions...). - Compose Cupertino
Compose Cupertino is a Kotlin Multiplatform library for the Compose Multiplatform UI framework. It provides various UI components for making native-looking iOS applications. - Kapacity
Kapacity is a lightweight, zero-allocation Kotlin Multiplatform library for Android and iOS designed to make handling digital data sizes safe, strictly typed, and intuitive. - Kotlinx DateTime Fun
Useful extension functions forkotlinx.datetimelibrary.
Target: Production
Showcase of real-world apps proving KMP is ready for prime time.
Ship your next iOS & Android app in days with Kotlin Multiplatform
Skip the boring setup. KMPShip is a KMP boilerplate with Firebase auth, RevenueCat, push notifications, CI/CD, and more already wired up. Go from idea to App Store & Google Play in days, not weeks.
Coding-Meet
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Careers
Kotlin Multiplatform job postings and opportunities.
wellfound • Where startups and job seekers connect.
🤝 Connect directly with founders at top startups - no third party recruiters allowed.
💸 Everything you need to know, all upfront. View salary, stock options, and more before applying.
✌️ Say goodbye to cover letters - your profile is all you need. One click to apply and you're done.
✨ Unique jobs at startups and tech companies you can’t find anywhere else.
We embrace principles of data-driven development, operational excellence, and continuous process optimization to deliver a stable, scalable platform. Central to our strategy is Kotlin Multiplatform, which empowers us to deliver high-quality features quickly and consistently across multiple ecosystems. By focusing on object-oriented design, modern coding practices, open-source frameworks, and third-party platform integrations, we continuously innovate and deliver at speed in this exciting and fast-moving market.
🚀 Get Featured!
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✍ Code Review
This newsletter is curated and written by a real human being. I’m always looking for ways to optimize the build. Was there something you liked or disliked in particular? Or did you find a bug in this issue? Simply reply to this email - I read every comment from the community and take your feedback into account for the next release.
Until next time,
Stay platform-independent!
Bogdan • Founder of commonMain.dev