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Jorge Castillo

@jorgecastillo.dev

Android at Disney+. Author of Jetpack Compose internals. πŸ‘¨β€πŸ« Compose course composeinternals.com πŸ“– Compose book jorgecastillo.dev/book

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27.04.2023
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Latest posts by Jorge Castillo @jorgecastillo.dev

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This is what Gemini generated about all our conversations so far 🀩

31.01.2026 19:24 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Mobile is dead.

Design is cooked.

Programmers are done.

Funny how the things AI supposedly killed are exactly the ones people are thriving in more than ever.

31.01.2026 11:18 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Jetpack Compose and Internals course Award winning course ⭐️⭐️⭐️⭐️⭐️ Master Compose and its internals.Created and delivered by Jorge Castillo: Disney+ engineer, ex-Twitter (X), author of the Jetpack Compose Internals book. Jorge has led ...

My real honest take is that you likely cannot find any other Compose course like this one out there.

That is the truth.

This course is the culmination of several years of careful exploration and diving deep into Jetpack Compose ❀️‍πŸ”₯

effectiveandroid.gumroad.com/l/dfedea

29.01.2026 22:40 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

β€œMobile dev is dead”

Meanwhile: more apps published to the stores than ever, more users than ever, more phones than ever.

As long as people use phones, mobile development will exist.

27.01.2026 19:41 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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A few shots

26.01.2026 20:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Backgrounds became an order of magnitude better on the platform now.

Just added support for lots of beautiful ones!

Go test them πŸ”₯πŸ“ΈπŸ“±

26.01.2026 20:41 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Software devs coming to teach you clean architecture in 2026.

Now more than ever

26.01.2026 06:35 πŸ‘ 8 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Just realised something.

This type of feature should be in ScreenshotWhale. It just makes a lot of sense.

A predefined set of backgrounds with fancy gradients that you can apply to either a single screenshot or all screenshots in a project.

26.01.2026 06:35 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Not in my plans to lie showing a fake % improvement in conversions if you use screenshots created with ScreenshotWhale.

Some products are doing that.

What I’ll do is give you the best tool possible to achieve the goal. Then you decide if it’s good enough to make a difference πŸ€·β€β™‚οΈ

25.01.2026 07:54 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

More and more people are starting to realise that nobody wants to consume generated content in social media.

Being authentic has always been the only way, and now more than ever. Sharing real stuff and learning together with your audience.

24.01.2026 10:53 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Just finished another quality of life improvement that users will welcome.

Save requests should be way faster now 🀩

Before, save was sending the full list of devices, with all their screenshots and layers. Now it calculates deltas and only sends the affected layers.

24.01.2026 09:24 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Early feedback from power users is key for any product. It helps you shape it up in a more appropriate/realistic/efficient direction, instead of guessing.

Give users what they want.

I’m living this myself with ScreenshotWhale. It is evolving so much lately πŸ‘πŸ‘

24.01.2026 09:14 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Compose Multiplatform 1.10.0: Unified @Preview, Navigation 3, and Stable Compose Hot Reload | The Kotlin Blog Compose Multiplatform 1.10.0 has been released with common @Preview annotation, support for Navigation 3 on non-Android targets, and bundled stable Compose Hot Reload.

Compose Multiplatform 1.10.0: Unified Preview annotation, Navigation 3, and Stable Compose Hot Reload πŸ‘‡

blog.jetbrains.com/kotlin/2026/...

23.01.2026 06:38 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Believe me when I say that your users couldn’t care less about your app being vibe coded or not.

They just care about the value it provides them.

22.01.2026 22:04 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

They need to be. And we must advocate for that.

22.01.2026 18:02 πŸ‘ 7 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

If everyone is using AI at work, it makes no sense to forbid it in tech interviews.

22.01.2026 17:55 πŸ‘ 8 πŸ” 0 πŸ’¬ 6 πŸ“Œ 2
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Worked on something incredibly cool last night πŸ™ˆ

Let me introduce automatic internationalization of your App Store and Play Store screenshots with ScreenshotWhale ✨πŸ”₯

22.01.2026 15:50 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Nothing good is instant. Real value compounds when you keep showing up.

I could’ve made ScreenshotWhale paid-only from day one. Instead, I let people try it, feel the value, and decide.

I think it’s finally at that point now. Fingers crossed 🀞

22.01.2026 06:30 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Most developers are not designers, and that is totally fine. This is where a powerful drag and drop editor shines.

It gives you structure so screenshots look consistent and intentional, helping you bootstrap solid App Store assets fast without a designer.

20.01.2026 18:20 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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LLM flexibility, Agent Mode improvements, and new agentic experiences in Android Studio Otter 3 Feature Drop News and insights on the Android platform, developer tools, and events.

Android Studio Otter 3 Feature Drop 🌟

android-developers.googleblog.com/2026/01/llm-...

20.01.2026 10:13 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

That’s only a consequence of how you are implementing it.

The only difference between updating a state to show / hide a small component within the same screen, and doing the same but to show / hide a full screen to the user, is the size of the component.

19.01.2026 06:10 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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App Store Screenshots Templates | Google Play Store & iOS App Mockups Professional app store screenshot templates for iOS and Android. Create stunning Google Play Store and App Store screenshots that boost downloads. Mobile app mockups made easy.

Some people mentioned Fastlane screenshot generation as a better alternative to ScreenshotWhale and other similar services.

Fastlane is great, but it is not a visual drag and drop design experience. That is the big difference, if you ask me.

18.01.2026 18:05 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
The Thinking Game | Full documentary | Tribeca Film Festival official selection
The Thinking Game | Full documentary | Tribeca Film Festival official selection YouTube video by Google DeepMind

Ok. The Thinking Game is so good. Go watch it.

youtu.be/d95J8yzvjbQ

18.01.2026 17:50 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Navigation state is also UI state.

What screen to display at any time is literally UI state. Don’t think of it differently.

18.01.2026 17:46 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Here is the 50% promotion code: EFFANDROID50

18.01.2026 08:00 πŸ‘ 0 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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App Store Screenshots Templates | Google Play Store & iOS App Mockups Professional app store screenshot templates for iOS and Android. Create stunning Google Play Store and App Store screenshots that boost downloads. Mobile app mockups made easy.

My friend @jorgecastillo.dev launched ScreenshotWhale, which generates professional App Store screenshots in minutes.

It provides auto internationalization for supporting multiple languages, quick switches between templates, and a smart AI generator for your full project.

screenshotwhale.com

18.01.2026 08:00 πŸ‘ 8 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
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ScreenshotWhale reached its first 100 users. This is going quick.

I’m already working in the next feature: a big improvement for an already existing one. Will share more when that work is complete.

Going for the first 200 πŸ“ΈπŸ“²

18.01.2026 10:47 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

It’s wild that some popular App Store and Play Store mockup tools still make you manage local save files. In 2026.

Obviously ScreenshotWhale stores everything in the cloud, as it should be ✌️

17.01.2026 13:53 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I don’t think software engineer roles are going to disappear. Tech has always evolved quickly, we just need to adapt and keep learning.

Don’t let it overwhelm you, It is actually motivating.

16.01.2026 06:37 πŸ‘ 8 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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App Store Screenshots Templates | Google Play Store & iOS App Mockups Professional app store screenshot templates for iOS and Android. Create stunning Google Play Store and App Store screenshots that boost downloads. Mobile app mockups made easy.

Templates are now 50% cheaper on screenshotwhale.com for limited time 😳

Templates are one of the entry points to the platform, along with subscriptions. They give you full access to the editor.

Makes sense to get more people using the platform.

15.01.2026 22:01 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0