iiinova — where your digital self keeps evolving

Ralf @ralf-wondratschek.com · 14/09/2026

I measured how much faster an agent can navigate an app and read its state by skipping the UI. Spoiler alert: the difference is significant. Another reason to decouple your business logic and navigation entirely from the UI layer. ralf-wondratschek.com/blog/headles...

Benchmark result preview from the article.

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Ralf @ralf-wondratschek.com · 31/08/2026

This is a reminder to write a hype doc to document your wins and achievements. AI can help you a lot and this can be fully automated.

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Ralf @ralf-wondratschek.com · 06/08/2026

I'm still maintaining App Platform and just pushed a list-detail sample for different screen sizes and how to handle this with the unidirectional dataflow. The sample runs as a web app too: vrallev.github.io/app-platform...

vrallev.github.io

App Platform

A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects.

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Ralf @ralf-wondratschek.com · 02/07/2026

Is anyone using App Platform? github.com/amzn/app-pla... I wanted to give a heads up that ownership of the repo was transferred to me and I'm considering to change the coordinates and packages to detach the project from Amazon. How much pain would this cause for consumers?

github.com

GitHub - vRallev/app-platform: A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects.

A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects. - vRallev/app-platform

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Ralf @ralf-wondratschek.com · 28/05/2026

I'm excited to share that I joined OpenAI this week, where I'll be working on Android infrastructure. My second stint at Block was shorter than expected, but I'm grateful for the time together with my team. I'm proud of what we accomplished and excited for what's next.

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Mark Allison @markallison.social · 27/04/2026

I've used Metro, and it's better than anything else, imo. It not only speeds up your builds, but makes DI easier, and also provides simpler upgrade paths if you're transitioning from other common DI frameworks. Huge thanks to @zacsweers.dev

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Ralf @ralf-wondratschek.com · 20/04/2026

I picked up some work on App Platform again, which I created during my time at Amazon. Metro now works perfectly well in KMP projects and therefore it's the recommended default! The latest version also comes with a compiler plugin to avoid KSP. github.com/amzn/app-pla...

github.com

Releases · amzn/app-platform

A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects. - amzn/app-platform

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Ray Ryan @rjrjr.com · 15/04/2026

Joel and Jacob are two of the most talented (and most pleasant!) people I have ever worked with.

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Ralf @ralf-wondratschek.com · 14/04/2026

We're wrapping up our migration to Metro internally for Square Android. I summarized some of our challenges and steps we took in a blog post. If you use Dagger 2 for a Kotlin project, then you should migrate to Metro sooner rather than later. engineering.block.xyz/blog/metro-m...

engineering.block.xyz

Metro Migration at Square Android

How Square Android migrated its monorepo from Dagger 2 and Anvil to Metro over nine months and saved thousands of hours of build time.

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Ralf @ralf-wondratschek.com · 10/04/2026

This is one of the best podcast episodes I have listened to in a while. Highly recommend podcastaddict.com/the-peterman...

podcastaddict.com

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Ralf @ralf-wondratschek.com · 08/04/2026

I'm more excited about this than I should be.

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Egor Andreevich @egorand.dev · 27/03/2026

KotlinPoet 2.3.0 supports typealias declarations inside types, has new convenience API for adding annotations and ships with a healthy dose of bug fixes. Time for a version bump! 🤜🤛 github.com/square/kotli...

github.com

Release 2.3.0 · square/kotlinpoet

Thanks to @haruue, @hfhbd, @yz4230, @mina-jaff, @BoD, @RaoPrashanth for contributing to this release. New: Kotlin 2.3.20. New: KSP 2.3.6. New: Support for defining type aliases inside other types....

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Ralf @ralf-wondratschek.com · 05/02/2026

One underrated improvement Metro brings is its easy setup. No more configuring KAPT, runtime modules, keeping versions in sync, etc. You apply the Gradle plugin, setup a tiny graph and the rest is driven through constructor injection, @ContributesBinding and its other features. This was all I needed

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Johannes Bechberger @mostlynerdless.de · 09/01/2026

Actually, OpenJDK 25 is 18% faster than OpenJDK 17 and 21 and a whopping 84% faster than OpenJDK 11. Upgrade now!

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Ralf @ralf-wondratschek.com · 05/01/2026

I recently migrated our codebase away from Ktlint to Ktfmt and Detekt. I summarized the reasons and migration steps in a blog post: engineering.block.xyz/blog/adoptin...

engineering.block.xyz

Adopting Ktfmt and Detekt

How Square Android replaced Ktlint with Ktfmt and Detekt and improved Kotlin formatting speed by 40% in a 60,000+ file codebase.

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Jesse Wilson @swank.ca · 28/12/2025

Kotlin compiler plugins are amazing! ✅ Expressive syntax ✅ Compile-time checked ✅ Fast at runtime

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Egor Andreevich @egorand.dev · 18/11/2025

Cash Android has recently switched to Metro, a new, fast dependency injection framework built for K2. That was a fun project and we're really happy with the results! Sharing details on how we approached the migration to help teams adopt Metro: code.cash.app/cash-android...

code.cash.app

Cash Android Moves to Metro

The Cash Android team have completed the migration to Metro.

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Bridget Phillips @jingibus.bsky.social · 08/11/2025

This is fantastic and @zacsweers.dev deserves all the praise but it also is gonna give you a false idea of what Z is like as a maintainer and author, what the project is like, and how you might achieve something like this yourself

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Ralf @ralf-wondratschek.com · 12/09/2025

After three wonderful years at Amazon I'm happy to share that I started this week at ... Square / Block again on my old team 🪃 I'm excited to think about developer productivity more deeply again.

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Ralf @ralf-wondratschek.com · 05/09/2025

Our KMP framework App Platform now supports Metro out of the box: github.com/amzn/app-pla... @zacsweers.dev is pushing the boundaries with Metro and there are still some Kotlin compiler bugs that need to be resolved, but on the JVM / Android it works.

github.com

Release 0.0.6 · amzn/app-platform

Added Added support for Metro as dependency injection framework. User can choose between kotlin-inject-anvil and Metro. For more details see the documentation for how to setup and use both depende...

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Ralf @ralf-wondratschek.com · 22/08/2025

I've been using ktfmt over KtLint for a few months for some projects. It's a blessing and so much easier to deal with. I forgot how much I missed 2 space indent in Kotlin. facebook.github.io/ktfmt/

facebook.github.io

ktfmt - the Kotlin code formatter

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Ralf @ralf-wondratschek.com · 25/07/2025

We published a new version of App Platform with back button support. We also added recipes for saving presenter state, app bar integration and backstack navigation. Working with Compose in the business logic (Molecule) and UI (Compose Multiplatform) is so much fun. amzn.github.io/app-platform...

amzn.github.io

Changelog - App Platform

A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects.

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Ralf @ralf-wondratschek.com · 18/07/2025

Anvil was quite successful inside and outside of Square, but now it's time for the next big improvement. Metro is 95% of what I pitched as Dagger 3 within Square. I'm excited.

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Gabriel Ittner @gabrielittner.bsky.social · 14/07/2025

Version 0.34.0 of the gradle-maven-publish-plugin finally comes with configuration cache support. Dropping support for Sonatype OSSRH unblocked us from waiting for Gradle to resolve the underlying issue on their side. github.com/vanniktech/g...

github.com

Release 0.34.0 · vanniktech/gradle-maven-publish-plugin

Added configuration cache support for publishing. Removed support for publishing through Sonatype OSSRH since it has been shut down. See the 0.33.0 release notes for upgrade instructions if you hav...

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Ralf @ralf-wondratschek.com · 15/07/2025

I had problems upgrading to the latest version of IntelliJ IDEA and Android Studio with the new Kotlin Multiplatform plugin. But now that it's working and Compose Hot Reload is running the integration is pretty nice. (This was my issue: youtrack.jetbrains.com/issue/KMT-11... )

youtrack.jetbrains.com

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Ralf @ralf-wondratschek.com · 02/07/2025

This is great. Unlimited PTO is a trap. Amazon works very similar to Bolt and learnt to like this a lot. www.kron4.com/news/technol...

kron4.com

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Ralf @ralf-wondratschek.com · 28/05/2025

The new version of App Platform is out with support for Wasm! The wiki has integrated the Wasm sample application from the repository to see the code in action. amzn.github.io/app-platform/

amzn.github.io

App Platform

A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects.

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Gurpreet Singh @imgurpreetsk.bsky.social · 23/05/2025

The problem was very well summarised and the solution well explained. Great talk!

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Ralf @ralf-wondratschek.com · 23/05/2025

Kotlin Conf is great and a lot of fun. I'm closing today with my session "Scale your Kotlin Multiplatform projects using dependency injection". I hope some folks are still around and don't travel home yet 😊 kotlinconf.com/schedule/?da...

kotlinconf.com

Schedule | KotlinConf 2025, May 21–23, Copenhagen

KotlinConf is the official Kotlin conference by JetBrains. It is a place for the community to gather and discuss all things Kotlin.

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Fabien Sanglard @fabinou.bsky.social · 22/05/2025

Indeed, we improved every parts of ADB Wifi pipeline. Besides support in Studio, you need ADB 36.0.1 (to be released soon) and Android 16.

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Ralf @ralf-wondratschek.com · 20/05/2025

I'm waiting for the AI agents from German companies named Günther, Jürgen or Klaus.

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Ralf @ralf-wondratschek.com · 07/05/2025

Where does one start with improving Android app performance? Should I start with writing benchmarks to establish a baseline? Should I enable StrictMode and LeakCanary first? How can I implement metrics in production? Are there any good guides for beginners you'd recommend?

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Ralf @ralf-wondratschek.com · 25/04/2025

That's me! I'm really excited about this topic and look forward to giving this talk at KotlinConf. I'll summarize how we got here and how painless dependency injection can be.

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Ralf @ralf-wondratschek.com · 17/04/2025

App Platform Launched App Platform is a lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects. I'm happy to announce that we open-sourced the project today! amzn.github.io/app-platform/

amzn.github.io

App Platform

A lightweight application framework for state and memory management suitable for Kotlin Multiplatform projects.

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Ralf @ralf-wondratschek.com · 03/04/2025

This is fantastic. This is so close to what I wanted Dagger 3 to be when I proposed this 5 years ago at Square. Well done @zacsweers.dev 🙏

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Michael Druker 🇨🇦 @mdruker.app · 21/03/2025

The hardest problem in software engineering is finishing migrations and it’s not even close

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Ralf @ralf-wondratschek.com · 07/02/2025

I was at @evernote.bsky.social when they started migrating to React Native in 2018. Against all advice from tech leads the SVP of engineering (coming from Amazon) pushed through. The quality of the Android app went downhill over the years not only performance wise.

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Ralf @ralf-wondratschek.com · 11/01/2025

Oh no, the bots are here.

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John O'Reilly @johnoreilly.dev · 22/12/2024

Just migrated the BikeShare #KMP/#CMP sample (github.com/joreilly/Bik...) to use kotlin-inject-anvil (had been using just kotlin-inject)....think maybe can be simplified further but still got rid of quite a bit of boilerplate code (particularly related to setup of Circuit factories)

github.com

GitHub - joreilly/BikeShare: SwiftUI, Jetpack Compose, and Compose for Desktop based Kotlin Multiplatform project (using CityBikes API http://api.citybik.es/v2/). Uses Realm for local persistence

SwiftUI, Jetpack Compose, and Compose for Desktop based Kotlin Multiplatform project (using CityBikes API http://api.citybik.es/v2/). Uses Realm for local persistence - joreilly/BikeShare

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Ralf @ralf-wondratschek.com · 06/12/2024

This is a great summary, thanks for writing it down!

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Kaushik Gopal @kau.sh · 26/11/2024

🎧 Episode #252 of Fragmented is out. Everyone needs a starter template! We also talk to @zsmb.co from @jetbrains.com about #Amper (their new build & config tool). Listen here: fragmentedpodcast.com/episodes/252 #AndroidDev #Podcast

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