look how they massacred my boy

Hi! I shipped jetc.dev Newsletter Issue #315! Google I|O 2026! Compose Multiplatform 1.11.0! Android is Compose-first! And... an LLM-powered layout?!? jetc.dev/issues/315 #JetpackCompose #AndroidDev

Hunting down Jetpack Compose recomposition issues manually is a huge time sink I’ve spent the past few weeks using @mmckenna.me’s Dejavu to simplify this: - Write Dejavu tests to establish a baseline - Tell the agent to hunt for issues and A/B fixes - Profit

If you somehow missed the KotlinConf keynote last week, here are the top 10 KMP announcements with links to learn more about each 🧵👇

Introducing Touch Robot, something that has materially changed how I write screenshot tests. We've been using it at Block for ~2 years to catch animation and gesture bugs that static screenshots miss. saket.me/touch-robot/

Situation 1: dev A thinks approach X is correct, dev B thinks Y is the right way. They argue and try to convince each other. Situation 2: dev A thinks approach X is correct, tells the LLM to implement it. There is SO MUCH learning in Situation 1, lost when using LLMs....

Screaming into the void some thoughts on AI coding. androidessence.com/leave-me-beh...

Yes @schimke.ee !! Thank you for making this 💚 github.com/yschimke/com...

Bring back the old school pull requests. https://dankim.com/learning-from-old-school-pull-requests/

I built Dejavu because agents don't feel extra recompositions. They write Compose code that compiles and passes its tests while the UI quietly does ten times the work. Dejavu turns that hidden work into a failing test, giving the agent a count to optimize against.

💠 Haze 2.0-alpha01 is out! This is a big release, splitting Haze up into layers, with the goal of enabling pluggable visual effects. Let me know what you think! chrisbanes.me/posts/haze-2...

Finally got around to bundling the skills I'm using every day into a repo and Claude Code marketplace so anyone can install them. I'm still rebuilding from what I was using daily at work, but we'll get there.

🎨 Color Snap 2026-04-28 #283D3B Pine 🟢🟢🟢 3/3

Metro reaches 1.0! It's the proudest work of my career and I strongly feel this is how dependency injection in Kotlin should be. Thank you to everyone that's contributed and helped this project get to where it's at. Metro wouldn't be where it is without you. www.zacsweers.dev/metro-is-sta...

Thank you for featuring Halogen!! 🥳

Wrote up something small about how I started using interface inheritance to handle inserting into multiple tables at a time in Room, when you have a common type used by multiple Daos and don't want to duplicate code. #AndroidDev androidessence.com/multi-table-...

Hit Claude limits for the first time ever with Opus 4.7 It's somehow equivalent to my last 30 days of Opus 4.6 use. This makes the model not worth using imo.

Thank you for featuring Halogen! 🙌

Live now! Come hang out for some chill Wednesday night coding twitch.tv/adammc

Just released version 0.3.1 of Dejavu! This release has some version bumps and a bug fix by @jamescullimore.bsky.social, our first contributor!! github.com/himattm/deja...

I finally did it. I finally decided to declare that I am #OpenToWork. See commonsware.com/blog/2026/04... for more!

Halogen 0.2.0 is out now with the halogen-image module! github.com/himattm/halo...

I know there's a lot of people that worked on this behind the scenes but on top of Ralf and Tom, I also wanna give a huge shout out to Joel Wilcox and Jacob Applin for a ton of contributions, pairing sessions over tuple, and starting work with me on Metro as far back as January 2025. Hire them!

Halogen will support images soon!

I just released jetc.dev Newsletter Issue #309! Design system rules! Cross-platform haptics! Cross-platform biometrics! Editors! More editors! And... yet more editors?!? jetc.dev/issues/309 #JetpackCompose #AndroidDev

Unfortunately I missed "April Cools" day, but I've been exploring niche uses of LLMs. I think the "LLM chat box" clearly has it's place, but is so underwhelming as a product addition. So here's a teaser! What if your app's theme could react to app state with no no config?

I built a tiny IntelliJ IDEA plugin for something that had been bothering me for years github.com/saket/intell...

AI can be a useful tool, but just like any tool, used improperly it can cause some serious damage. And if you take a hard look at the AI hype train, there’s an awful lot of that going on right now. (4/4)

This year at Square we started shipping aggressively. Powered by a completed migration, new feature roadmaps, and AI adoption, we shifted into a build, demo, iterate, ship cycle. My team was showing our work to other engineers all the way up to the C-suite.

Dejavu is now Kotlin Multiplatform! (v0.3.0) Track and test recomposition regressions on: - Android - Desktop - iOS - WasmJs dejavu.mmckenna.me

The IntelliJ documentary is out now: www.youtube.com/watch?v=Kour... And it also covers the origin of Android Studio!

Just updated some wording for Dejavu to focus more on UI efficiency rather than performance thanks to some feedback.

OK, I shipped jetc.dev Newsletter Issue #306! Compose patch and beta releases! Compose Multiplatform alpha release! @mmckenna.me on recomposition testing! @aditlal.dev on recomposition budgets! And... is it time to take action?!? jetc.dev/issues/306 #JetpackCompose #AndroidDev

Thanks @androidweekly.bsky.social for featuring Dejavu! I just shipped v0.2.0 with CompositionObserver integration. When a recomposition assertion fails, you see exactly which state object caused it, and the value progression. github.com/himattm/dejavu

When it comes to AI agents / AI tooling + coding, I hear an awful lot of talk about: Efficiency Iteration speed / PR output rate / lines of codes produced I hear zero mentions about: Quality Customer obsession This will bite back, and it probably already is...

I've been using @zed.dev more and more as I work with AI tools. It's speed is amazing, but I missed the IntelliJ Islands theme. So I made it! Find it in Zed extensions. 😁 github.com/zed-industri...

I just published jetc.dev Newsletter Issue #305! Compose Multiplatform patch! FlexBox! CameraX! Permissions! ContentScale! @mmckenna.me on testing recomposition counts! NFC! jetc.dev/issues/305 #JetpackCompose #AndroidDev

Today I’m open-sourcing Dejavu! Testing UI performance in Jetpack Compose is frustrating. We profile and watch tools, yet regressions still creep in. I built Dejavu to make recomposition behavior something you can actually test.

Live now! Exploring a new testing lib from @mmckenna.me! Come checkout Dejavu with me here: twitch.tv/adammc

Ask anyone who worked at Block/Square what they loved most and I guarantee you the first thing they'll say is "its the people". blog.mmckenna.me/cook-togethe...

Two Pillars of (Engineering) Management www.zacsweers.dev/two-pillars-...

I have had too much coffee for the lack of work I need to do today. 😬

It's been a fun ride, but today is my last day at Block / Square. I started working with Android in 2014 and quickly grew to know Square for their engineering excellence and open source work.

Newly open sourced, check out qrgo! This utility easily lets you capture QR codes for your emulators. github.com/block/qrgo

What if your AI agent could order lunch? 🥑 We connected Goose to Square's Neighborhood MCP App. Now it can find nearby restaurants, browse real menus, and build your order. Avocado toast with feta? It's on the way! Try it out ⬇️

A new weather app? WHY YES. By the creators of Dark Sky? CAN I GET A HELL YES: acmeweather.com/blog/introdu...

Didn't expect to stream today but I was able to make it so going live for an hour to do some chill coding if you're around! twitch.tv/adammc

It is the year 2026, people are still confused about compileSdk and targetSdk. (e.g. you can have targetSdk that is higher than compileSdk) www.liutikas.net/2026/02/13/R... Maybe this will explain it a bit more. #android

Just published "Where are all the staff+ Android product engineers?" www.zacsweers.dev/where-are-th...

Stood up a repo with some of the claude plugins I've put together for personal projects. Things like setting up Metro DI, android a11y, and Airbnb's Showkase UI gallery library. github.com/benoberkfell...