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Writes The Pragmatic Engineer, the software-engineering newsletter, and wrote The Software Engineer's Guidebook. Formerly an engineering manager at Uber, and at Microsoft/Skype and Skyscanner before that.

• BlueskyChecked my spam folder Saw emails from Instinct's AI bot Closed my spam folder Cold email is increasingly dead, and tools like Instict will speed it up even more

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• x.comChecked my spam folder Saw emails from Instinct's AI bot Closed my spam folder Cold email is increasingly dead, and tools like Instict will speed it up even more

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Systems and developer-tools engineer at Cloudflare as of 2026, on durable infrastructure for AI agents; worked on React and PartyKit before that. Writes at sunilpai.dev.

• It’s been 2 hours and I can already tell this is going to be my most popular post. See the replies. And I’m getting so many DMs from people who went through the same, I’m glad it’s connecting. 2 quick things - - please consider the solution!! it’s counterintuitive and no one considers it but it’s super effective - I hope managers see this too and use it as a tool to help their reports
  Quoting@threepointonenew post: the senior engineer death spiral https://t.co/xzgU1jVBRh a friend just started a big job and asked for some advice. so I braindumped a monologue about a super common failure mode I see with engineers and posted it here, hope it helps whoever it can.

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Writes The Pragmatic Engineer, the software-engineering newsletter, and wrote The Software Engineer's Guidebook. Formerly an engineering manager at Uber, and at Microsoft/Skype and Skyscanner before that.

• So many people in the replies saying it's overcomplicated, and no proof that this works And then plenty other folks saying that at their startup/company they built this the below pretty much, and then a few new things Different speedlanes when it comes to agents + pipelines
  Quoting@GergelyOroszHere's what OpenAI's agentic software factory looks like, today. Details: https://t.co/UUZufLxG2r (thanks to all the OpenAI folks who explained how it works! And Perf Factory looks especially interesting to me)

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Writes Hyperdimensional, a newsletter on AI policy and governance. A White House AI policy adviser in 2025; joined OpenAI on 6 July 2026 to lead its Strategic Futures team.

• op deleted his tweet (thanks I guess) but I get a ton of questions about why I sometimes limit replies, and if you’d like to know the answer you can look below.
  Quoting@deanwball@sponkostonko I limit my replies when it occurs to me to do so to make it slightly harder for people to threaten me and my family with violence, which happens frequently in my life now. It still happens, but at least with replies limited my wife is less likely to see it.

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Sociologist at Duke University writing on markets, exchange and moral order, and on plain-text and data-visualisation tools for social science.

• Targeted flattery-spam/phishing aimed at harmless academics like me is leveling up! Book Club rubbish is so last month. Thanks, LLMs! I just got a highly elaborate six-paragraph one “from” Emily St John Mandel (of Station Eleven fame). The choice of author to impersonate is really quite clever. Like the book club spam, it’s trawling for somewhat vain people who are susceptible to flattery, which of course excludes academic authors [puts hand to ear] sorry I’m just getting an update

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Co-founder and CEO of 37signals, makers of Basecamp and HEY; co-author of Rework, Remote and It Does Not Have to Be Crazy at Work.

• One of the easier Fuck No's in a while. Spam obviously, but what a bold ask. No starving kids or terminal diseases. Just buy me a McLaren 650S! At least he added a .shit to the end of his email. 😂

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Deep-learning researcher and Turing Award laureate; founder of the Mila institute.

• Over the past few days, I've taken the time to summarize my thoughts on the recent incidents involving agents’ misaligned behavior. We don't know with certainty what comes next, but we know where these issues originate, and this can help us plan the path forward. Please feel free to ask your questions in the replies, and I’ll try to answer some of them in the coming weeks.

  yoshuabengio.org

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Programmer and writer on computer architecture, performance, and software reliability. He has worked on CPU design at Centaur Technology and on software at Google and Microsoft, and writes long-form technical essays at danluu.com.

• I've been surprised to find that sometime in past six months or year, ChatGPT has generally started returning better results than Google for me. OpenAI probably has fewer employees than Google Search alone, and what fraction of OAI works on search? On the order of 1%? Arguably an unfair comparison because ChatGPT takes 20x longer to return a result, but Google doesn't have a "20x slower but don't return https://danluu.com/seo-spam/ knob"

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Programmer on the Dart language at Google and author of Game Programming Patterns and Crafting Interpreters; previously a game developer at EA.

• RE: https://climatejustice.social/@chu/117242750410634529 I love this toot and all the replies.

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Writer and novelist. Publishes essays and book notes at nateliason.com; author of the novel Husk and of Crypto Confidential.

• I’ve started getting this aggressive comment spam on my posts, is it just a new thing on X or is someone trying to tank my reach?

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Writes jvns.ca, turning "hard and scary" topics — networking, debugging, Linux internals — into plain explanations and hand-drawn comics. Publishes Wizard Zines, illustrated programming zines. Software developer based in Montreal.

• i've started getting a lot of emails (maybe one every few days) that appear to be LLM generated from people asking for some kind of feedback or collaboration on their LLM-generated app feels sad because I used to like it when people emailed me about something cool they made and now I just have to send it all straight to spam

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British designer and technologist; co-founder of the design studio BERG, which made Little Printer, and writer of the blog Interconnected.

• what's going on with spam calls? I'm now getting two calls/day from random mobile numbers (not on the usual "who called" sites) and they're not leaving any kind of call screening message or voicemail. last couple of weeks, big uptick

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Machine learning engineer and independent AI consultant. He writes about LLM evaluation, tooling and applied ML at hamel.dev, and previously worked on machine learning at GitHub.

• Curious why machine learning is not applied to the X timeline more? If somebody is replying once a minute for 8 hours they should be flagged. When I look at reply bot replies its super obvious
  Quoting@simonwQuestion for people who run autoreply bots here: are you not worried about the negative impact they have on your professional reputation? Anyone checking your profile here - a potential future employer for example - will instantly be able to tell you automated replies with a bot

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Co-founder of Foundry Group and of Techstars. Has blogged at Feld Thoughts since 2004 and has written or co-written nine non-fiction books on startups and venture capital.

• A reader emailed to say he was getting tired of the setting. He was right, so I'm adding 40 chapters to Zero Knowledge - 23 of them inside the part that's already published.

  zeroknowledge.ink

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Developer and podcaster; created Instapaper and Overcast, co-founded Tumblr, and co-hosts the Accidental Tech Podcast.

• RE: https://infosec.exchange/@clayton/117175171619298911 It's OK. This feature is awesome, and one I use heavily. Every social network needs a few mutes here and there. Nobody inherently deserves anyone’s attention. If someone replies in a way that makes me think, "I'd rather not hear from this person again,” I just mute forever. No aggressive block, no report or feedback, no way for them to know. It's not meant to send a message, get revenge, or influence anyone else — just tailor my feed for me.

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Software engineer and founder of Block Party; previously an engineer at Pinterest and Quora, and a co-founder of the non-profit Project Include and the tech diversity data project Where are the Numbers?

• i'm always so excited to see that there are new replies to my slack threads until i realize it's just claude (sorry claude)

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Writes jvns.ca, turning "hard and scary" topics — networking, debugging, Linux internals — into plain explanations and hand-drawn comics. Publishes Wizard Zines, illustrated programming zines. Software developer based in Montreal.

• how do you think about how SSH public key authentication works (versus passwords) and what about your mental model makes you trust it? please only answer if you _don't_ understand the math of how RSA (or elliptic curves etc) works, I'm interested in exploring what it means to understand the interfaces around public key authentication without actually learning number theory (also obviously do not try to explain the math to me, also don't explain to folks in replies unless specifically asked)

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FreeBSD developer and former FreeBSD Security Officer; founder of the Tarsnap online backup service and author of the scrypt key derivation function.

• In case anyone else trips over this: There seems to be an IPv6 routing loop between us-west-2 and the network Let's Encrypt sends HTTP challenges from; this is causing renewals to fail. I've emailed the network engineering contact listed in ARIN whois.

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Designer and engineer; formerly principal research engineer at GitHub Next; writes at wattenberger.com.

• there's something rotten in the air when >90% of the replies to a tweet like this are mean spirited sure, it might not be your thing and it's easy to forget this box doesn't go straight into the void. but can we try to bring more kindness into the world?
  Quoting@WattenbergerI look away for one week and VSCode got cute?!

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Hosts the Lex Fridman Podcast — long, unhurried conversations with scientists, engineers and public figures. Several of the interviews quoted elsewhere on this site are episodes of it.

• It was an honor to hang out with Jensen Huang, CEO of @nvidia, and do a long-form podcast with him. Really fun & fascinating technical deep-dive conversation on & off the mic. One of the most brilliant & thoughtful human beings I've ever met. NVIDIA is the most valuable company in the world by market cap and is the engine powering the AI revolution. Podcast probably out tomorrow (Monday) unless I get stuck in too many interesting conversations while running around in SF ;-) PS: I haven't checked my messages in days. Sorry for slow replies 🙏 Trying to stay deeply focused at in overwhelmingly…

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Mathematician and maker of the 3Blue1Brown YouTube channel, which explains mathematics through animation. Creator of the open-source Manim animation library and founder of the Summer of Math Exposition.

• Welp, somewhat embarrassingly, yesterday this account was briefly compromised and someone posing as me promoted a crypto project supposedly "tokenizing" manim. Thank you to those of you who quickly flagged it as spam and alerted me to the problem. For future reference, it's a safe bet that you'll never see me creating and promoting a meme coin.

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Research scientist at Anthropic; co-creator of the Variational Autoencoder and, with Jimmy Ba, of the Adam optimizer, two of the most widely used tools in deep learning.

• Funny how the replies reveal that many people can't actually shape rotate in their mind
  Quoting@ylecunTo people who claim that "thinking and reasoning require language", here is a problem: Imagine standing at the North Pole of the Earth. Walk in any direction, in a straight line, for 1 km. Now turn 90 degrees to the left. Walk for as long as it takes to pass your starting point. Have you walked: 1.…

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