Jorge Castillo
@jorgecastillo.dev
Android at Disney+. Author of Jetpack Compose internals. 👨🏫 Compose course composeinternals.com 📖 Compose book jorgecastillo.dev/book
I don’t know if I ever shared this here, but I created a platform to help Android devs overcome the 12 testers for 14 days Google Play requirement to unlock production. Completely free. Android devs helping each other. You test apps, and you get credits to list yours for test 👇 get12testers.com
Get12Testers — Get 12 testers for 14 days continuously and for free
Meet Google Play testing requirement. Get your app tested by 12 testers for 14 days continuously.
get12testers.com
Is the Android community still alive in any social network? Every time I ask about this people say it’s mostly BlueSky but I see people highly inactive here. I wonder if I’m not following the right people
People think 60fps means you’ve got 16.67ms to run each frame of your app. Nope. That time window is not full for your app to use 👇
Skills are not free, and people are choosing to stay a bit silent about it. Thought it might be good to put some thoughts together about this 👇 The Downsides of Agentic Skills open.substack.com/pub/effectiv...
The Downsides of Agentic Skills
Skills are seductive.
open.substack.com
AI codes for us most of the time now, either we like it or not. I created thedroid.club to push myself to explore how to leverage AI for improving my proficiency as Android developer. Surrounding yourself by people with your same interests always makes a big difference. Great decision so far 💯
Droid dot Club: premium domain name (Buy now) - droid.club
Droid dot Club is a premium domain name for sale
droid.club
This is what Gemini generated about all our conversations so far 🤩
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.
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 ❤️🔥 effectiveandroid.gumroad.com/l/dfedea
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 ...
effectiveandroid.gumroad.com
“Mobile 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.
Backgrounds became an order of magnitude better on the platform now. Just added support for lots of beautiful ones! Go test them 🔥📸📱
Software devs coming to teach you clean architecture in 2026. Now more than ever
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.
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 🤷♂️
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.
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.
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 👏👏
Compose Multiplatform 1.10.0: Unified Preview annotation, Navigation 3, and Stable Compose Hot Reload 👇 blog.jetbrains.com/kotlin/2026/...
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.
blog.jetbrains.com
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.
If everyone is using AI at work, it makes no sense to forbid it in tech interviews.
Worked on something incredibly cool last night 🙈 Let me introduce automatic internationalization of your App Store and Play Store screenshots with ScreenshotWhale ✨🔥
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 🤞
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.
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.
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.
screenshotwhale.com
Ok. The Thinking Game is so good. Go watch it. youtu.be/d95J8yzvjbQ
The Thinking Game | Full documentary | Tribeca Film Festival official selection
YouTube video by Google DeepMind
youtu.be
Navigation state is also UI state. What screen to display at any time is literally UI state. Don’t think of it differently.
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
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.
screenshotwhale.com
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 📸📲
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 ✌️
