Jorge Castillo

🚨 Jetpack Compose Internals Course goes unchained. No more cohorts. No waiting. Cheapest than ever 🔥 ✅ One time payment ✅ Lifetime access to all content ✅ Lifetime access to private Discord community ✅ Compiler, runtime, slot table, recomposition, more effectiveandroid.gumroad.com/l/dfedea

Something that has become even more obvious with AI is that people only value the things you actually put time and effort into. Every dev out there vibecoding sass and tools in a few prompts and no one using them.

If you cannot differentiate if a test failed because you introduced a regression or just because you are refactoring the subject under test, then you don’t have a test, but something else. A test has exactly 0 value if this is the case.

A quick reflection on AI and what we decide it to be 🧠🤔

One of the most exciting things about AI is the opportunity to make things better. Not everything has to be a race to monetize it. Expose injustice. Solve real human problems. Advance medical research. Make our lives easier. There’s so much more we could be building!

Global ranking of testers for get12testers.com 🏆💯

Heron 3.0.9 is out with performance improvements, and an even more immersive gallery 😊

OpenJDK is another example of a company forbidding the use of AI in contributions. openjdk.org/legal/ai

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

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...

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 💯

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

“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.

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/...

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.

Android Studio Otter 3 Feature Drop 🌟 android-developers.googleblog.com/2026/01/llm-...

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.

Ok. The Thinking Game is so good. Go watch it. youtu.be/d95J8yzvjbQ

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

Here is the 50% promotion code: EFFANDROID50

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

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 ✌️

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.

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.

Compose Hot Reload first stable release 💯 blog.jetbrains.com/kotlin/2026/...

Just added align center option to layers in ScreenshotWhale ↔️↕️ The product keeps improving 🤩

Here is how I am helping vibe coders speedrun their App Store screenshot creation process. Removing the final bottleneck for indie mobile devs out there 🔥 If you want in, please use the EFFANDROID50 coupon to get a big 50% discount 🙌 Find it in screenshotwhale.com