Joined September 2009
- Tweets 22,615
- Following 1,508
- Followers 8,481
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1,262 Photos and videos
Apr 22
Remember everyone, LLMs are amazing math models that can make extremely correct *looking* code.
By pure coincidence, these are sometimes right and the more guardrails and feedback you give it, the more likely it's actually correct.
But finding error is *very* hard, by design.
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Apr 22
Imagine if you had one of those genies that would grant wishes, but always in the most subtly wrong way while technically doing exactly what you asked.
Then imagine you asked it to write code that looked correct and big free.
The genie smirks and says "as you wish"
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Apr 22
The resulting code is amazing and upon initial inspection looks perfect. Even running it appears to just work on the first try.
But you said it needs to *look* correct, not that it had to *be* correct.
Be careful out there and wish wisely.
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Tim Caswell retweeted
Mar 30
When Opus 4.5 came out, it was a one-way door to a new way of engineering. Agents now do most of our coding.
Knowing the inherent flaws and over-confidence of LLMs, we sent a clear message to our teams. Vibing and mission-critical infrastructure don’t go together.
We’re sharing some of our early internal guidance in how we’re “agenting responsibly”, prioritizing security, durability, and availability at all times.
vercel.com/blog/agent-respon…
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Mar 12
This was a fun project to work on! Again we balanced technical performance with operational complexity and found a really nice solution.
Mar 10
Bulk redirects on Vercel now scale to 1 million per project with near-constant lookup time.
We shipped the simplest thing first, profiled it in production, and iterated from there ↓
vercel.com/blog/scaling-redi…
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Jan 10
I've been iterating on a new encoding format that's LLM friendly. It's a very interesting challenge because tokens are not bytes and especially challenging when you consider that the LLM needs to be able to comprehend the custom format. This makes competing with JSON hard.
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Jan 10
What's really exciting is that the pretty-printed version is actually less bytes than the compact form of JSON. It's more tokens than compact JSON because tokenizers optimize for JSON and the pretty-printed whitespace hurts, but still impressive nonetheless.
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28 Dec 2025
"O remember, remember, ...; yea, remember that there is no other way nor means whereby man can be saved, only through the atoning blood of Jesus Christ, who shall come; yea, remember that he cometh to redeem the world."
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Tim Caswell retweeted
28 Nov 2025
i'm looking for someone truly obsessed with web performance to join the Next.js team
no need for prior framework experience, just strong React skills and real product performance wins :)
if you love squeezing every millisecond out of the web, please reach out 🙏
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21 Nov 2025
I'm glad the steam machine will be priced like a PC. That means they are not strongly incentivised to lock it down with tons of DRM.
I've got an old switch and old playstation that are practically useless. I wish I could reuse the hardware. But it's very hard and risks bricking.
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21 Nov 2025
One of the things I loved about WebOS devices was how open they were. Even getting root access to the underlying Linux was fully supported and the bootloader was unlocked.
The hardware far outlived the demise of HP/Palm because of this and they became usable android tablets.
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19 Nov 2025
“Consider how you use your time and determine what is the good, better and best use of it...
Whatever your belief, give yourself regular time to quietly contemplate, serve others and spend quality time with the people you love.”
- Paul Rand
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19 Nov 2025
Quote from an address to the Scottish Parliament yesterday scottishparliament.tv/meetin…
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13 Oct 2025
You know how in programming there are off-by-one errors. Well when building with American dimensional lumber there are off by 1.5" errors.
I accidentally built some stairs with a 9" rise instead of a 7.5" rise because I measured the wrong side of the 2x12 when calculating.
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13 Oct 2025
In general, the alternating stairs are a lot nicer than I expected and they use a lot less space than traditional stairs. This is important as we're about to start our tiny home and I need all the living room space I can get for all the couches!
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13 Oct 2025
I added some alternating stairs to the camper deck as a test run to see how we liked them in practice.
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