iiinova — where your digital self keeps evolving

Jorge Castillo @jorgecastillo.dev · 27/09/2026

Compose A2UI renderer is the type of tool that can change the nature and the future or Android apps. Imagine an app where some parts of its UI or flows are fully dynamic and delegated to an agent 👇

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Jorge Castillo @jorgecastillo.dev · 21/08/2026

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

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Jorge Castillo @jorgecastillo.dev · 20/08/2026

Global ranking of testers for get12testers.com 🏆💯

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Jorge Castillo @jorgecastillo.dev · 16/08/2026

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

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Jorge Castillo @jorgecastillo.dev · 15/08/2026

Jake Wharton announced yesterday that all the Lysine projects (OkHttp, Okio, Retrofit, SQLDelight…) don’t allow contributors to use LLMs to generate code or write PR descriptions/comments.

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Jorge Castillo @jorgecastillo.dev · 10/08/2026

IN THEORY AppFunctions is the implementation of MCP for Android. Official docs say that other apps and agents than Gemini should be able to use them. Reality is that it is now blocked for Gemini only. Not sure if there’s any intention to open up that permission to other apps in the short-mid term.

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Jorge Castillo @jorgecastillo.dev · 18/06/2026

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 👇

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Jorge Castillo @jorgecastillo.dev · 31/01/2026

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

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Jorge Castillo @jorgecastillo.dev · 26/01/2026

Backgrounds became an order of magnitude better on the platform now. Just added support for lots of beautiful ones! Go test them 🔥📸📱

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Jorge Castillo @jorgecastillo.dev · 26/01/2026

Software devs coming to teach you clean architecture in 2026. Now more than ever

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Jorge Castillo @jorgecastillo.dev · 26/01/2026

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.

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Jorge Castillo @jorgecastillo.dev · 22/01/2026

Worked on something incredibly cool last night 🙈 Let me introduce automatic internationalization of your App Store and Play Store screenshots with ScreenshotWhale ✨🔥

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Jorge Castillo @jorgecastillo.dev · 18/01/2026

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 📸📲

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Jorge Castillo @jorgecastillo.dev · 13/01/2026

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

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Jorge Castillo @jorgecastillo.dev · 12/01/2026

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

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Jorge Castillo @jorgecastillo.dev · 02/01/2026

iOS devs explaining the complexities of device fragmentation to Android devs

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Jorge Castillo @jorgecastillo.dev · 01/01/2026

Some of the diagrams in the Compose internals cohort course 🤩 These took a while to create, but really had a blast. There is some beauty on turning complex concepts into intuitive diagrams.

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Jorge Castillo @jorgecastillo.dev · 27/12/2025

course discount has been performing great. It was meant to end on Xmas day, but quite a few people asked yesterday and today about it and I see no reason to not extend it until end of the year. Price will get back to normal on Jan 1. effectiveandroid.gumroad.com/l/dfedea/ddw...

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Jorge Castillo @jorgecastillo.dev · 26/12/2025

Android devs milliseconds after typing “gradle build”

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Jorge Castillo @jorgecastillo.dev · 24/12/2025

Liquid Glass shader in Jetpack Compose using AGSL ✨

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Jorge Castillo @jorgecastillo.dev · 23/12/2025

One more Jetpack Compose + AGSL warping effect shader

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Jorge Castillo @jorgecastillo.dev · 23/12/2025

You can do cool things with shaders in Compose using RuntimeShader and AGSL (Android Graphics Shading Language). Here is a warping effect shader 😵‍💫 This code runs directly on the GPU using Android's RenderEngine.

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Jorge Castillo @jorgecastillo.dev · 23/12/2025

Strong skipping has been enabled by default for a while in Compose, yet official docs still say things like unstable params make Composables not skippable. Very confusing if you ask me, especially for people starting with Compose. developer.android.com/develop/ui/c...

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Jorge Castillo @jorgecastillo.dev · 22/12/2025

An example of what you can do with shaders in Jetpack Compose By abduzeedo.

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Jorge Castillo @jorgecastillo.dev · 17/12/2025

Kotlin 2.3.0 release landed yesterday and it includes the new explicit backing fields feature (experimental)

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Jorge Castillo @jorgecastillo.dev · 08/12/2025

Every Android dev when starting a new project

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Jorge Castillo @jorgecastillo.dev · 05/12/2025

Ok let's make this happen. Paperback version of Jetpack Compose Internals around the corner 🧐📖 No sense that it took me so long to do this tbh.

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Jorge Castillo @jorgecastillo.dev · 25/10/2025

Deferring state reads in Compose helps avoid extra recompositions ⚡️ Read state only where it’s needed, for example by passing a lambda instead of the value. Even better, use lambda-based modifiers like offset {} or drawBehind {} so reads happen in layout or draw, skipping composition completely.

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Jorge Castillo @jorgecastillo.dev · 27/09/2025

Added a couple new features to ScreenshotWhale 🐋

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Jorge Castillo @jorgecastillo.dev · 24/09/2025

Composition, Layout, Drawing. Compose goes through the 3 phases to produce a frame. But they can skip independently. Where you read state matters. Not the same reading it during composition than during layout. Thats why it’s often better to use lambda version of some modifiers.

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Jorge Castillo @jorgecastillo.dev · 15/09/2025

Discussing Subcomposition and when NOT to use it 🧐 vm.tiktok.com/ZNdgAHnd4/

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Jorge Castillo @jorgecastillo.dev · 14/09/2025

When you said “the number of DEVS”, but you don’t want to edit

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Jorge Castillo @jorgecastillo.dev · 14/09/2025

Adding extra screenshots to any device type is possible now 🙌 I've been putting so much time and energy on creating fancy features this week that totally forgot about this super basic one 🫣🤯 Start creating your own Android or iOS app store screenshots in screenshotwhale.com 🐋

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Jorge Castillo @jorgecastillo.dev · 13/09/2025

Just added project settings option to screenshotwhale.com 🐋 Now you can kick-off your screenshots blazing fast 🔥

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Jorge Castillo @jorgecastillo.dev · 12/09/2025

New branding for my app screenshot generation site 🐋💦🤩 Founding members already getting access. Getting closer to the official open release every day!

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Jorge Castillo @jorgecastillo.dev · 09/09/2025

Your GitHub history can look like this, and it’s ok. If you know you can do a job, apply. I've met so many great devs that weren't active on GitHub publicly. We need to understand that not everybody prioritizes side projects, for many reasons. And that does not invalidate them for the job, at

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Jorge Castillo @jorgecastillo.dev · 06/09/2025

My thoughts when iOS devs started complaining about having to support more than 2 form factors.

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Jorge Castillo @jorgecastillo.dev · 06/09/2025

Generated these using Storeshots just now ✨ I am using the actual StoreShots own editor to quickly create all the templates that will be available in the platform.

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Jorge Castillo @jorgecastillo.dev · 04/09/2025

Many of you asked, now it’s live. Just unlocked PPP pricing 🌍 and 2-installment payments for the Jetpack Compose Internals course 🚀 Don’t miss this chance to grab it cheaper before you regret it. effectiveandroid.gumroad.com/l/dfed…

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Jorge Castillo @jorgecastillo.dev · 03/09/2025

I wrote about my journey with Compose. From sharing online, to writing a book, to launching a course, to making side income from it. If you’re thinking about doing something similar, I hope this gives you a push 🙌 composeinternals.com/how-i-made-s...

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Jorge Castillo @jorgecastillo.dev · 03/09/2025

15,000 people decided to hit follow. that number feels surreal. Thank you for reading, supporting, and sharing along the way. Every connection here has made this journey richer, and i’m grateful to be part of this community. Love ya ❤️

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Jorge Castillo @jorgecastillo.dev · 02/09/2025

Smart recomposition is what makes Jetpack Compose feel fast and efficient. But the real magic behind it is recomposition scopes ✨ I wrote a breakdown that explains what they are, how they work under the hood, and why they matter for performance (with examples) 👇 composeinternals.com/c

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Jorge Castillo @jorgecastillo.dev · 31/08/2025

Love this pearl that I received some time ago for the GDE program. Looks perfect on the shelf 🤩 Compose all the things! 🦸‍♂️🚀

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Jorge Castillo @jorgecastillo.dev · 31/08/2025

Every wondered what concurrency strategy the Compose runtime uses to coordinate state writes, and why? Learn about MVCC (Multiversion Concurrency Control) on this post I wrote some time ago. composeinternals.com/concurrency-co…

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Jorge Castillo @jorgecastillo.dev · 30/08/2025

People still think degrees, honors, and certificates matter in tech. Reality: no company cares. They want proof you can ship, learn fast, and solve problems.

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Jorge Castillo @jorgecastillo.dev · 27/08/2025

Programmers. Twin part is that same dev can be one or the other, depending on the day. Via @midudev

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