JustinCast

Ethereum Blockchain Engineer ⛓ Follow me on

[JustinCast @_JustinCast]

Part of the students in the most recent class of the Solidity course that I’m teaching 👨🏻‍🏫

[Stitch by Google @stitchbygoogle]

Meet the new Stitch, your vibe design partner.

Here are 5 major upgrades to help you create, iterate and collaborate:
🎨 AI-Native Canvas
🧠 Smarter Design Agent
🎙️ Voice
⚡️ Instant Prototypes
📐 Design Systems and DESIGN.md

Rolling out now. Details and product walkthrough video in 🧵

[Naval @naval]

Coding an app is the new starting a podcast.

[Claude @claudeai]

A small thank you to everyone using Claude: We’re doubling usage outside our peak hours for the next two weeks.

[JustinCast @_JustinCast]

I built something for developers who struggle with prompt engineering.

Meet Promptly — an AI prompting trainer designed to help you sharpen your skills through hands-on practice.

🔗 Try it out: https://t.co/P4OzmJFkWO

[Beja @0xBeja]

A few months ago I began creating content and raising awareness about the opportunities for developers through OSS and Web3.

Genuine and authentic content fueled by my personal brand and experiences.

Yesterday 50 devs signed up for the first official @OnlyDust_com LATAM event.

[Ethereum Costa Rica🇨🇷 ETH Pura Vida 1st Nov 2025 @EthereumCR]

And liftoff!! 🚀

As a community we're partnering with @ForteGlobal to onboard new developers into the Ethereum ecosystem

During the next 7 weeks we're kicking of an intro course to onboard over +30 woman to web3 by the hands of @_JustinCast replicating @EthKipu 's educ content

[IQ @IQAICOM]

Meet the brains from BrainDAO building IQ v3 which includes new dapps like IQ Code (first #AI for smart contracts) and https://t.co/spn0CQaQEF (AI hub for crypto news).

There are also updates to https://t.co/ZO5en09d3g and the IQ tokenomics.

https://t.co/gCbvGzLFIR

[etherscan.eth @etherscan]

Did you know? 🤔

Etherscan currently supports a simple display of ERC-4337 Account Abstraction transactions

Let's delve into how ERC-4337 transactions are executed on Ethereum 🧵

[JustinCast @_JustinCast]

I'm thrilled to share that I'll be speaking at Ethereum Costa Rica Day, the very first in-person event of the Ethereum Costa Rica community! Join me on November 14th for an introduction to creating digital assets using the ERC20 token standard Ξ.

https://t.co/8jNYQ3CKwc

[JustinCast @_JustinCast]

https://t.co/PEruVrLxEw

[ETH Kipu @ETHKipu]

Mañana puedes unirte a una sesión para aprender a navegar en Github y cómo comenzar a contribuir en https://t.co/4EXT0tHsyP 💜

Toda la info 👇

[JustinCast @_JustinCast]

🔥

[Ethereum Costa Rica🇨🇷 ETH Pura Vida 1st Nov 2025 @EthereumCR]

🇪🇸 ¡Estamos emocionados de presentar a nuestro primer partner y avenue para Ethereum Costa Rica Day!
🇬🇧 We´re excited to present our first partner and avenue for Ethereum Costa Rica Day!

@texastechCR 🏛️🤘🎉🐎👩‍🎓👨‍🎓

📅 18 de Noviembre 2023
📌 Texas Tech University CR - Av. Escazu

[Ethereum Costa Rica🇨🇷 ETH Pura Vida 1st Nov 2025 @EthereumCR]

New devs on the making ⌨️ 💻😎

Este fin de semana fue la 2nda clase de Apriendiendo a Programar #Solidity en #CostaRica

Liderada por el crack @_JustinCast y apoyadas por nuestros partners @EthKipu y @Teccr en San Carlos.

https://t.co/FrVh08z2M4

[JustinCast @_JustinCast]

@happytf @emmanueldmlr DM me

[JustinCast @_JustinCast]

Part of the students in the most recent class of the Solidity course that I’m teaching 👨🏻‍🏫

[JustinCast @_JustinCast]

@emmanueldmlr Forgot to mention that the course is in Spanish 😅

[JustinCast @_JustinCast]

@emmanueldmlr Maybe. Wanna get in?

[JustinCast @_JustinCast]

@leisterac Thanks 🫱🏻‍🫲🏼

[Ethereum Costa Rica🇨🇷 ETH Pura Vida 1st Nov 2025 @EthereumCR]

Dicen dicen....que vamos a tener un lugar chivisima para el Ethereum Costa Rica Day 🔥🔥👀

[Ethereum Costa Rica🇨🇷 ETH Pura Vida 1st Nov 2025 @EthereumCR]

🛠️ ¡Desarrolladores, atención! 🛠️

¿Por qué considerar Ethereum para tu próximo proyecto? Aquí hay algunas ventajas que hacen que Ethereum sea una opción emocionante para los constructores de aplicaciones: