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Ralf

@ralf-wondratschek.com

990 followers 120 following 78 posts

https://ralf-wondratschek.com/ | Senior staff engineer at Block / Square, formerly Principal Engineers at Amazon and Evernote | GoogleDevExpert for Android | https://github.com/amzn/app-platform

ralf-wondratschek.com

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Ralf @ralf-wondratschek.com · Apr 17

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/

App Platform

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

amzn.github.io

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Ralf @ralf-wondratschek.com · 20d

Here is my take: amzn.github.io/app-platform...

Presenter - App Platform

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

amzn.github.io

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Ralf @ralf-wondratschek.com · 27d

I'm quite proud of what I accomplished with my team at Amazon and will miss them. I'll keep working on App Platform as much as I can thanks to open source! amzn.github.io/app-platform/

App Platform

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

amzn.github.io

Ralf @ralf-wondratschek.com · 27d

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 · Sep 5

Metro is conceptional very similar to Dagger + Anvil and kotlin-inject-anvil, which made this migration easy. I expect most new development to happen for Metro, so I wouldn't use kotlin-inject-anvil for new projects anymore.

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Ralf @ralf-wondratschek.com · Sep 5

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.

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...

github.com

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Ralf @ralf-wondratschek.com · Aug 22

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/

ktfmt - the Kotlin code formatter

facebook.github.io

Ralf @ralf-wondratschek.com · Aug 2

Can I delete this now? github.com/Evernote/and...

GitHub - Evernote/android-job: Android library to handle jobs in the background.

Android library to handle jobs in the background. Contribute to Evernote/android-job development by creating an account on GitHub.

github.com

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Ralf @ralf-wondratschek.com · Jul 25

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...

Changelog - App Platform

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

amzn.github.io

Ralf @ralf-wondratschek.com · Jul 24

Today I learned that Cleanse from Square was deprecated. I haven't tried Needle yet, but it makes the same promises as Dagger.

github.com/uber/needle

GitHub - uber/needle: Compile-time safe Swift dependency injection framework

Compile-time safe Swift dependency injection framework - uber/needle

github.com

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Ralf @ralf-wondratschek.com · Jul 18

Singleton in the scope by default, based on the large codebases I've seen. I've written @SingleIn way too often and explained way too often why a class doesn't need to be a Singleton. I want this to be explicit.

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Ralf @ralf-wondratschek.com · Jul 18

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.

Zac Sweers @zacsweers.dev · Jul 18

Metro wouldn’t be where it is without the road that Anvil paved before it. I’ve really enjoyed working with Joel and Jacob on several Metro features already, with @ralf-wondratschek.com in its early design phase, and really looking forward continuing to work with all of them.

Future’s bright 🚇

Ray Ryan @rjrjr.com · Jul 18

Anvil is approaching the icebox, long live Metro.

github.com/square/anvil...

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Reposted by Ralf

Gabriel Ittner @gabrielittner.bsky.social · Jul 14

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...

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...

github.com

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Ralf @ralf-wondratschek.com · Jul 15

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

Ralf @ralf-wondratschek.com · Jul 6

This is where I found AI tools to be helpful.

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Ralf @ralf-wondratschek.com · Jul 2

That reminded me of this old issue: developer.squareup.com/blog/chasing...

Chasing Swallowed Exceptions

Handling uncaught errors and crashes in testing

developer.squareup.com

Ralf @ralf-wondratschek.com · Jul 2

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...

www.kron4.com

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Ralf @ralf-wondratschek.com · Jun 19

The recording is now online: www.youtube.com/watch?v=oRKy...

Scale your Kotlin Multiplatform projects using dependency injection | Ralf Wondratschek

YouTube video by Kotlin by JetBrains

www.youtube.com

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Ralf @ralf-wondratschek.com · May 28

Two weeks of pain and it's over.

Ralf @ralf-wondratschek.com · May 28

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/

App Platform

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

amzn.github.io

Ralf @ralf-wondratschek.com · May 27

It would increase the pressure on Google to ship libraries with CMP from the beginning. I don't see them making such an investment at this point in time. At least they put the right abstractions in place to support CMP, which is already a big win.

Ralf @ralf-wondratschek.com · May 24

I uploaded the slides of my presentation. Thank you all for coming 🙏

ralf-wondratschek.com/presentation...

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Reposted by Ralf

Gurpreet Singh @imgurpreetsk.bsky.social · May 23

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

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Ralf @ralf-wondratschek.com · May 23

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...

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.

kotlinconf.com

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Reposted by Ralf

Fabien Sanglard @fabinou.bsky.social · May 22

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 · May 20

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