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Rodrigo Sicarelli @rsicarelli.bsky.social · 25/02/2026

🚀 Happy to announce Fakt Fakt is a Kotlin compiler plugin that uses FIR/IR phases to generate type-safe fakes at compile time ✨ Give it a try → github.com/rsicarelli/f...

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Rodrigo Sicarelli @rsicarelli.bsky.social · 14/11/2025

Using the Default Hierarchy Template in KMP? You probably shouldn't 👀 It creates intermediate source sets you might not need — with real build cost. ⚠️ New article on the hidden costs and when to use a custom hierarchy instead 👇 dev.to/rsicarelli/t...

dev.to

The Hidden Cost of Default Hierarchy Template in Kotlin Multiplatform

Introduction The Default Hierarchy Template in KMP projects is a great way to reduce...

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Reposted by Rodrigo Sicarelli

Kotlin by JetBrains @kotlinlang.org · 27/09/2025

📱 Two Years with Kotlin Multiplatform: From Zero to 55% Shared Code At KotlinConf’25, @rsicarelli.bsky.social shared how StoneCo – serving 4M+ users – scaled KMP adoption, trained 130 engineers, and achieved 55% code sharing across two large-scale mobile apps. 📺 kotl.in/u5aa8v

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Rodrigo Sicarelli @rsicarelli.bsky.social · 21/05/2025

We're mentioned in the Large Scale KMP adoptions 🥹🥹 android-developers.googleblog.com/2025/05/kotl...

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Rodrigo Sicarelli @rsicarelli.bsky.social · 09/05/2025

Only one or the other. If the type is internal, there is no need for the annotation! We ended up building a Gradle Plugin called KMP Lint to help us on this journey (the only scalable way in our case). We plan to open source it soon 🤞

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Rodrigo Sicarelli @rsicarelli.bsky.social · 09/05/2025

There is a doc in the Kotlin repo on this topic: github.com/JetBrains/ko... Yes, hacking.md 🤣. Lots of outdated stuff, but an interesting read!

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Rodrigo Sicarelli @rsicarelli.bsky.social · 08/05/2025

Also use internal and @/HiddenFromObjC annotations properly. Over-exposing Kotlin code to objc headers increases the link time, and also the .framework size!

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Rodrigo Sicarelli @rsicarelli.bsky.social · 08/05/2025

Kotlin 2.1 has a new linker, plus an upgrade from LLVM 11 to 16. There is also a compiler flag to disable some optimisations, the `-Xdisable-phases', which we can use to disable the LTO optimisation. There is a flag to profile the compiler phases (works on 2.0 too), the `-Xprofile-phases`

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Rodrigo Sicarelli @rsicarelli.bsky.social · 08/05/2025

We ended up creating some scripts on iOS setup that selects the targets and built type for the .framework. Pretty much, local and CI (tests) we do iosSimulatorArm64 + debug. For internal test flight builds, we do iosArm64 + debug. For prod, iosArm64 + release. We avoid release at all costs 👀

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Rodrigo Sicarelli @rsicarelli.bsky.social · 07/04/2025

I'm more than excited to share our KMP journey at KotlinConf'25 🎉 Whether you're considering KMP or scaling it in your organization, join me to hear about some of our results and future plans! See you in Copenhagen ✌️

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Rodrigo Sicarelli @rsicarelli.bsky.social · 21/03/2025

Special thanks to @kaeawc.bsky.social for pointing me in the direction of using VisualVM, which has now become my best friend 😂

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Rodrigo Sicarelli @rsicarelli.bsky.social · 21/03/2025

FINALLY managed to understand JVM settings and how to tweak them. Before: ~17gb allocated (Gradle + Kotlin daemons) After: ~8gb allocated (with some extra heap for buffer) Same build time 🎉🚀

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Rodrigo Sicarelli @rsicarelli.bsky.social · 13/03/2025

Chegou a ver se essas libs fazem algum import específico do iOS? As vezes, só organização de source set já suportaria rs

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Rodrigo Sicarelli @rsicarelli.bsky.social · 07/03/2025

Quase finalizando o KMP-102, nem acredito 😭

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Rodrigo Sicarelli @rsicarelli.bsky.social · 07/03/2025

📢 Novo artigo da série KMP-102 Dessa vez explorei estratégias de modularização em projetos KMP Coraçãozinho pra dar uma força 🙏 Boa leitura ✌️ dev.to/rsicarelli/k...

dev.to

KMP-102 - Modularização no KMP

No último artigo, entramos em detalhes e aprendemos sobre as peculiaridades do código exportado nos...

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Rodrigo Sicarelli @rsicarelli.bsky.social · 24/02/2025

does KMP scale? I think it does 👀

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Rodrigo Sicarelli @rsicarelli.bsky.social · 11/02/2025

a beleza do conhecimento livre ✨ print aleatório que me mandaram

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Rodrigo Sicarelli @rsicarelli.bsky.social · 29/01/2025

1 month of selective CI on a large Android repo saved almost 2k dollars monthly. Feels good ✌️

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Rodrigo Sicarelli @rsicarelli.bsky.social · 28/01/2025

I am just looking for a reason to buy an m4 mini 🥹 they are so portable 🤏

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Rodrigo Sicarelli @rsicarelli.bsky.social · 28/01/2025

I need a m4 mini at home for this ASAP

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Rodrigo Sicarelli @rsicarelli.bsky.social · 26/01/2025

O r1 se compara com o GPT o1 que custa 200 doletas mês, só que de graça e realmente melhor Usa um rolê de deep think, é como se a AI conversasse com ela mesmo antes de te responder, poderoso d+ Só tem que ativar no chat

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Rodrigo Sicarelli @rsicarelli.bsky.social · 24/01/2025

100% apoiado hahahahaha Imagino que deve engajar pra galera clicar, mas comigo não funciona rs

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Rodrigo Sicarelli @rsicarelli.bsky.social · 24/01/2025

O vídeo preview vc diz reproduzir automaticamente na lista de vídeos?

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Rodrigo Sicarelli @rsicarelli.bsky.social · 18/01/2025

Uma das vantagens de estar só no bsky essa época do ano é o filtro de conteúdo daquele reality show 25 Não que eu não tô assistindo (pois é) mas consumir isso o tempo todo? N obg ✋

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Rodrigo Sicarelli @rsicarelli.bsky.social · 18/01/2025

Descobri que o problema tá totalmente relacionado a construção dos Headers do Obj-C 🎯. Comecei a escrever sobre o tema na série KMP-102, mais artigos irão vir 🏃 dev.to/rsicarelli/k...

dev.to

KMP-102 - Otimizando a Exportação do Kotlin para o Obj-c/Swift

No último post, aprendemos como utilizar código Kotlin no Swift. Aprendemos sobre algumas técnicas...

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Rodrigo Sicarelli @rsicarelli.bsky.social · 10/01/2025

Heh, new insights. It turns out that we are exporting too many dependencies to XCFramework. There is no need to export everything: only what you need to consume on the Swift code. Just applied the api/impl modularisation strategy to XCFramework and it works 👀 will collect build time results soon

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Rodrigo Sicarelli @rsicarelli.bsky.social · 07/01/2025

The only hope so far is Kotlin 2.1, which updates LLVM from 11.1.0 (Feb 2021) to 16.0.0 (Mar 2023). Reading the release notes, there seems to have been serious work on linking performance 🤞

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Rodrigo Sicarelli @rsicarelli.bsky.social · 07/01/2025

Had some new findings on this: - Increasing JVM settings has no effect on build time - The "link" task on KGP is the main issue. This task delegates the linking process to LLVM. - xcodebuild -create-xcframework seems to have a virtual impact. - Could not find any LLVM hack to boost CPU usage

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Rodrigo Sicarelli @rsicarelli.bsky.social · 24/12/2024

Wake me up when the páscoa ends

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Rodrigo Sicarelli @rsicarelli.bsky.social · 24/12/2024

Looks like a 2025 problem 🤙💨

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Rodrigo Sicarelli @rsicarelli.bsky.social · 24/12/2024

Found something interesting 🔎 XCFramework assembly on KMP uses ~9% of my CPU 👀 maybe that's why it takes so long to finish (40 minutes on my M3 pro) Does anyone know how to speed up this execution? Maybe a hidden flag? 🤔

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Rodrigo Sicarelli @rsicarelli.bsky.social · 23/12/2024

Our first feature using CMP on iOS is live to 1% of our user base 🥳🥳🥳

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Rodrigo Sicarelli @rsicarelli.bsky.social · 01/12/2024

"A delightful mix of dev wizardry and casual humor, with a sprinkle of existential dread" hell yeah 🌚

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Rodrigo Sicarelli @rsicarelli.bsky.social · 28/11/2024

Navigating through Gradle logs just ✨ sucks ✨, especially for large builds. The wrapper delegates the commands (with options) to ./gradlew, but captures the error output and runs a Gradle log analyzer that digests and spotlights all the issues 🦣 using kotlin scripts 💨

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Rodrigo Sicarelli @rsicarelli.bsky.social · 28/11/2024

2024 and here I am, creating a wrapper for gradlew (wrapper)

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Rodrigo Sicarelli @rsicarelli.bsky.social · 28/11/2024

Terminei a primeira temporada de Silo ontem e: pqp

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Rodrigo Sicarelli @rsicarelli.bsky.social · 22/11/2024

Genuinamente feliz que hoje é sexta ✨

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Rodrigo Sicarelli @rsicarelli.bsky.social · 21/11/2024

It turns out that Kotlin scripts are much better at processing files than regular shell scripts. Processing a file with ~4k lines took about 1 minute using a shell script. Using Kotlin scripts + coroutines it went down to 2-3 seconds 👀

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Rodrigo Sicarelli @rsicarelli.bsky.social · 21/11/2024

The difference between release and debug builds is huge. I wonder how much optimization is going on here 👀

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Rodrigo Sicarelli @rsicarelli.bsky.social · 21/11/2024

We reduced CI time by 22% (from 50.63 to 39.38) on a large iOS repo ❤️. The amount of learning we've gotten from optimizing builds on iOS feels good. However, our CD still takes 50 minutes to build the KMP XCFramework in release mode 🫠. Hopefully K2 will help us out here 🤞

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Rodrigo Sicarelli @rsicarelli.bsky.social · 20/11/2024

Foi o show que o Nick Valensi tava com a perna engessada?

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