Staff Eng @Shopify (building @Shop) Former @reactnative core maintainer Ex-@Microsoft @sovtechagency open source • tech • mental health • agentic
London, Europe, Earth 🌍
Joined March 2009
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Lorenzo 'kelset' Sciandra retweeted
After 20 hours, the outage finally being mitigated
Talking with Microsoft devs, the issue was NOT DNS (like many guessed), but it WAS networking
I'm told the fix took so long because it had to be a forward fix... moving stuff from the legacy Exchange system over to...
🥁 ...drumrol... 🥁
Azure!!
(impressive)
Lorenzo 'kelset' Sciandra retweeted
Fun timing: I'm now leading engineering for Sidekick as well. Hiring EMs for both. Come help millions of entrepreneurs make it real.
Sidekick: shopify.com/careers/engineer…
Mobile: shopify.com/careers/engineer…
Lorenzo 'kelset' Sciandra retweeted
Madness - 12 hours into the outage. Microsoft is posting regular updates but they have not figured out what is causing servers to die when brought back online
From their updates it sounds like it’s a thundering herd + some other weird issue they’ve yet to pinpoint
Lorenzo 'kelset' Sciandra retweeted
Holy shit this isn't a RCA, it's a novel
I wasn't sure what I'll do the hour it takes to get from Heathrow to central London but now I do: reading this extremely detailed postmortem
These attacks are happening everywhere and FINALLY someone gives proper details
A detailed report of the October 21st security attack
blog.railway.com/p/incident-…
Lorenzo 'kelset' Sciandra retweeted
I had no accesso to Mythos / Fable 5.2 before tonight, but I wanted to check if a system recently checked by expert humans and updated had still issues. 20 minutes later there were two severe bugs uncovered. I'll not tell which project it is, it does not matter. Mythos is good.
Lorenzo 'kelset' Sciandra retweeted
This has been the most ambitious architecture I've had the pleasure to work on, and the benefits are huge.
Having agents follow strict patterns that would be tiresome for human developers, was the biggest contributor to its success. Software engineering is back baby!
We rebuilt our mobile apps in Swift and Kotlin with agents. To keep pace and hold our quality bar, we built Reflex: an agentic-first architecture that lets agents build and verify app behavior across iOS and Android without needing devices or simulators.
Here's how it works, piece by piece:
shopify.engineering/reflex
Lorenzo 'kelset' Sciandra retweeted
When we decided to rebuild one of our biggest apps natively, we went back to the drawing board with a basic question: how should a mobile app be built when agents write most of the code?An agent can write code in seconds, but it takes several minutes to test whether it works.
So we built Reflex: an agentic-first architecture that lets agents build and verify app behavior across iOS and Android without needing devices or simulators.
shopify.engineering/reflex
Lorenzo 'kelset' Sciandra retweeted
recommended reading. i have many feelings about this.
rikiyat.github.io/blog/weigh…
Lorenzo 'kelset' Sciandra retweeted
Fable 5.5 vs GPT 6.2 Astra vs Opus 5.5 vs GPT 6 Astra
same prompt: create an SVG of a PS5 controller
the jump from the older models is actually crazy. the latest Fable and Astra models are really on another level, especially with the details and overall design.
Fable 5.5 and GPT-6.2 Astra will be the new SOTA for SVG generation and the next few weeks will be insane.
which one did it better?
This quoted post is unavailable.
the Android CLI is one of the most slept on agentic supports tools out there - they set the bar so high
🚀 A massive batch of new commands landed in Android CLI 💻, just in time for Android Dev Summit!
Render Compose Previews to PNG & JSON (android preview) 🎨
Investigate crashes and ANRs via Crashlytics (android signals) 🐛
Record system traces & heap dumps (android profiler) ⚡
Inspect APKs, DEX & R8 (android analyze) 📦
Plus a fresh release of Android skills for many areas, including ML Kit Agent API, Jetpack Ink, Glance, and more 😌
Learn more ⬇️ 🤙 :
goo.gle/android-cli
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Lorenzo 'kelset' Sciandra retweeted
One of the nicest things, my mom was a store owner and sadly didn’t have shopify during covid. Now seeing folks get to success is beautiful
She just received her first @Shopify order and started crying.
When I worked at Shopify I saw that reaction and what the first order meant for entrepreneurs through countless - incredible - videos.
But this was the first time in person and in the moment.
Beautiful.
i know i'm super tunnel visioned but in the last week i've noticed so many more apps on my iPhone update to use native/glass toolbars and tabbar... I KNOW WHAT YOU ARE DOING DEVS 😂
sending hugs to y'all, the iPhone Duo support wave is real
✨Shop is gonna look so fine on it✨
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this is amazing
Feeling cheesy? Built this iPhone Duo concept this morning with Opus 5.5 via @splinetool MCP. Designed by hand in Figma/Ps whilst eating a cheese toastie and drinking waay too much coffee.
Genuinely the first time I've utilised 'Bevel & Emboss' since 2006.
Why did I build it? I have no idea. 🧀 🖤
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