Principal Software Engineer/iOS Infrastructure @JustEatTakeaway. Ex-Intelligence agent. Wannabe Crusty.

Joined June 2009
1,798 Photos and videos
🤩 Very proud of this article. It's not every day that I write something like this. 🤖 Here I describe how at @JustEatTakeaway we have created a scalable CI of macOS runners. 🔄 Please share this with your DevOps, Platform Engineering, and iOS teams! medium.com/justeattakeaway-t…
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And so I asked Fable 5 to find vulnerabilities in Luca 🚀 github.com/LucaTools/Luca/re…
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Alberto De Bortoli albertodebo.bsky.social retweeted
🛠️I built an AI agent that runs iOS UI tests in plain English! I've started from Claude #Haiku on #Bedrock, ending up fully local with #gemma4 on #Ollama. The full dev process, what broke, and what fixed it 👇 andrea-scuderi.com/blog/uixc… #iOSDev #Swift #AI #UITest
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Alberto De Bortoli albertodebo.bsky.social retweeted
More AI-generated code doesn't make your team faster. It might actually slow you down.
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Alberto De Bortoli albertodebo.bsky.social retweeted
Today, Xcode ships with agent skills for SwiftUI (with the ability to export them to use with any agent). These skills will help you and your agent create modern, idiomatic, and performant SwiftUI and make the best use of brand-new APIs. We have synthesized best practices of years of adoption for SwiftUI with context and explanation to help you build amazing and powerful apps. Let us know what you think!
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They're sheeple, overdrinking from a fountain of mediocrity.
I've got an agent in a loop optimizing a renderer with the goal to minimize frame times (and tests to measure). It got times down from 88ms to 2ms and allocations down from ~150K to 500. Sounds good, right? Wrong. This is exactly why agent psychosis is a big fucking problem. As an experiment, I rewrote the Ghostty core render state in Go, with access to identically laid out data structures as Ghostty and the exact same validation tests. I made a purposely naive renderer (simple, correct, but slow). 88ms per frame with 150,000 allocations (horrendous, lol)! I then kickstarted a Ralph loop to bring the frame times down. I told it it can't modify input data structures or the public API or tests (they're correct), but it can do anything else it wants. It got to work. It has worked for about 4 hours. I've spent around $350 on this experiment so far. The results? 88ms => 1.5ms 150K allocs => ~500 allocs Incredible right? Nope. My hand-written renderer I ported has frame times (same benchmark) of ~20us (0.020ms) and 0 allocations in the update path. This is the problem with psychosis and lacking systems understanding. If you don't understand the system, you're going to accept that this is an incredible result. If you understand the system, you'll see better solutions immediately and can do roughly 75x better on throughput. The people who blindly trust agent output are in the former camp. They're sheeple, overdrinking from a fountain of mediocrity. Standard disclaimer: I use AI all the time. I like AI. The point I'm making is to not blindly accept results. Think. Analyze. Learn.
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Mo really gets it.
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I found the actual reason AGI isn't real
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Alberto De Bortoli albertodebo.bsky.social retweeted
I got curious: what if iOS UI 🛠️tests were just… a sentence? So I built UIXCute 📦a Swift Package where you describe what you want to test in plain English, and an AI agent drives your app through XCUIAutomation until it's done. youtu.be/BvyyRCgq2CM #Swift #iOS #AI #XCTest

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not all heroes wear capes
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Every word
I strongly believe there are entire companies right now under heavy AI psychosis and its impossible to have rational conversations about it with them. I can't name any specific people because they include personal friends I deeply respect, but I worry about how this plays out. I lived through the great MTBF vs MTTR (mean-time-between-failure vs. mean-time-to-recovery) reckoning of infrastructure during the transition to cloud and cloud automation. All those arguments are rearing their ugly heads again but now its... the whole software development industry (maybe the whole world, really). It's frightening, because the psychosis folks operate under an almost absolute "MTTR is all you need" mentality: "its fine to ship bugs because the agents will fix them so quickly and at a scale humans can't do!" We learned in infrastructure that MTTR is great but you can't yeet resilient systems entirely. The main issue is I don't even know how to bring this up to people I know personally, because bringing this topic up leads to immediately dismissals like "no no, it has full test coverage" or "bug reports are going down" or something, which just don't paint the whole picture. We already learned this lesson once in infrastructure: you can automate yourself into a very resilient catastrophe machine. Systems can appear healthy by local metrics while globally becoming incomprehensible. Bug reports can go down while latent risk explodes. Test coverage can rise while semantic understanding falls. Changes happens so fast that nobody notices the underlying architecture decaying. I worry.
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it's official. humans have gone bonkers. you should be ashamed of yourself Chris. youtube.com/watch?v=RnxTTF8x…
Introducing Zero The programming language for agents. I wanted a systems language that was faster, smaller, and easier for agents to use and repair. Explicit capabilities. JSON diagnostics. Typed safe fixes. Made for agents on day zero.
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As I've been saying for a long time
I must admit that nothing about computers, since I'm in love with the field, was so uninteresting as the Javascript different fashions, waves, frameworks, rewrites, hypes. And I'm one that loves almost every shit programming related.
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#AWSSummit26 positively overwhelming as planned!
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