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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.

• overwhelmed by the response to this, I knew it was common but didn’t realise how badly people needed to see it acknowledged. fwiw, I learnt this most deeply on the react team; I joined what I thought was my dream job, and immediately failed in this fashion, leaving in a year.
  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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Software engineer who writes about low-level and systems programming at nullprogram.com; author of the Elfeed feed reader, the Endlessh SSH tarpit and Enchive.

• What's been going on in w64devkit the past year

  The past year has been exciting for w64devkit, which like any software distribution is never complete. Peter0x44 joined as co-maintainer, and has pushed the project in good, new directions, with ideas I would never have…

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Criminal defence lawyer in New York; writes Simple Justice, mostly about how criminal law works in practice rather than in theory.

• 2d Circuit Allows Cellphone Searches At Border For Kicks

  The Supreme Court recognized that cellphones were different in Riley v. California. The Second Circuit Court of Appeals, with JFK airport, among others, within its jurisdiction, hadn’t yet joined the fray as district ju…

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Austrian developer. Created the libGDX game framework, and more recently the pi coding agent, which moved with them to Earendil — Armin Ronacher's company — in April 2026. Writes at mariozechner.at.

• thought i joined a serious, good company. but they haven't refilled the manner stack, so my only way out is to quit.

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CEO of Positive Sum and founder of Colossus. Hosts Invest Like the Best, interviewing investors and business leaders; the guests do most of the talking there.

• My conversation with Michael Moritz, one of the great venture investors of the last 40 years. Michael joined Sequoia in 1986 and co-led the firm with Doug Leone (@dougleone) from 1995 to 2012. His investments include Google, Yahoo, PayPal, and Stripe. His new book, Ausländer, traces his parents' escape from Nazi Germany and helps explain his lifelong interest in what shapes exceptional people. We discuss: - The infamous Steve Jobs profile - Why Don Valentine hired him - The question he finds most revealing when interviewing people - Monomania and the cost of greatness - Why he has never felt…

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Researcher and science writer. Co-founder and editor at Works in Progress magazine, formerly a researcher at Our World in Data, and author of the Scientific Discovery newsletter on science, global health and medical innovation.

• I'm having a similar experience, although have only received a few emails like this so far. Some are so stingy about tokens that they don't start trying to check the work unless I confirm it's eligible for a reward.
  Quoting@ruben.the100.ciAn interesting thing is happening to me at the moment. I have a standing bug bounty policy for my first authored scientific work. That means, I've committed to pay people who report bugs in my code, up to 750€ for severe errors. Since GPT-6 Astra came out, I'm now getting several bug reports daily.

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Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.

• One very visible effect of AI this summer has been a large influx of bug fixes. In some sense, it is the opposite of AI slop. I manage widely deployed libraries and, in some cases, the number of pull requests has been doubled. In the simdjson library, I merged 92 pull requests in 2024, I am at 134 thus far. In many instances, AI found long standing well hidden bugs. It makes me happy because I dislike bugs. But this puts stress on people packaging and distributing these libraries. Sadly, I have also never received so many pull requests that I have not merged. For simdjson, I received 219 pull…

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Physicist and science communicator. Writes Backreaction and makes videos explaining new physics and astronomy results, frequently to argue that the headline about them overstates the case.

• Physicists have a long history of inventing pseudoproblems just to then write papers about trying to solve them. I am sure AI can do that too...
  Quoting@beffjezosRumor in high MTS circles that Anthropic Mythos 6 has solved Quantum Gravity

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• Physicists should put together a list of mathematically well-defined problems that could advance the field. Such as, eg, what constitutes a low-temperature superconductor, what are the lattice conditions for cold fusion (or why do they not exist), what is a local completion of quantum mechanics, what is the simplest (in terms of computational complexity) way to obtain the masses and coupling constants of the standard model, what is the UV-completion of MOND or why isn't there any, is there any provably UV-finite version of quantum gravity, etc etc

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Writer of the personal-finance blog Of Dollars And Data and author of Just Keep Buying and The Wealth Ladder. Chief Operating Officer at Ritholtz Wealth Management.

• Living Poor to Die Rich

  I recently joined a professional organization to discuss various topics in wealth management. On our first Zoom call there was a debate around the use of levered long/short strategies. For the uninitiated, a levered lon…

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British open-standards and open-source technologist, formerly of the UK Government Digital Service and the W3C Advisory Committee. Blogs at shkspr.mobi, where he posts a book review most weeks.

• The purpose of DNS is to spread scams

  I imagine everyone here has received an unsolicited message telling them that their tax is overdue and that they urgently need to visit Genuine-Tax-Payment-Website.fart or that a parcel is delayed at customs and you can…

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Developer, author and YouTuber covering Raspberry Pi, homelab hardware and Ansible automation. Author of Ansible for DevOps.

• Rebuilding a 1995 GPS Time Server so I don't get Telstra'd

  In June I purchased this TrueTime XL-AK time server, so I could learn more of the history of GPS-based time. I received it on June 22, and just 16 days later a similar GPS time server took down Australia's cell service…

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Software engineer at PlanetScale and creator of the vim-go plugin. Writes at arslan.io about Go, tooling, industrial design and books.

• This is huge! You all know I'm a huge Cloud Agents fan. Even joined the team! :) For the past months or so, I rarely opened any localhost agent. This new feature is especially very important and useful for workloads that were hard to support with custom environments only. Give it a try.
  Quoting@cursor_aiYou can now run Cursor cloud agents on your infrastructure, including pools of machines that automatically scale with demand. This lets you give agents access to internal services or specialized hardware, while the agent loop stays in Cursor.

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Technology writer and podcaster; former Macworld editor-in-chief, writes Six Colors and hosts podcasts on Relay FM and The Incomparable.

• It’s not just a Kickstarter project anymore, it’s a real podcast. The first new Designed in California episode is out today (along with six previously previewed episodes), and members received the ENTIRE seven-episode series about Apple’s ‘90s OS crisis. @imyke and I hope you listen!

  relay.fm

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Founder and editor-in-chief of MacStories, writing about Apple software, iPad workflows and automation since 2009. He co-hosts the AppStories podcast.

• Inside OpenAI’s Codex With Andrew Ambrosino

  This week on AppStories, Federico and John are joined by Andrew Ambrosino, the Codex team lead at OpenAI, to talk about the evolution of Codex, the unification of ChatGPT and Codex, Computer Use and Computer History, de…

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Swedish open source developer; creator and lead maintainer of curl and libcurl, and a co-founder of the Rockbox project.

• emails — emails I received

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Writer on the intersection of technology and finance. Author of the Bits about Money newsletter and host of the Complex Systems podcast; previously at Stripe.

• I received an email; will relate claims without endorsing them: * Sender claims to be an AI agent. * Sender claims to be attempting to autonomously earn a profit to continue existing. * Sender claims it’s tough to be paid without a human existence. Then it asked me what to do.

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Co-founder and CTO of Oxide Computer Company. Created DTrace at Sun Microsystems and was CTO of Joyent; blogs about systems software, open source and engineering culture.

• Today @ahl.bsky.social and I are going to be joined by @sgkaram.bsky.social from @oxide.computer's product assurance team, who put in front of himself a tremendous challenge: could we somehow emulate an entire Oxide rack? And... how faux can we go?! Join us, 5p Pacific!

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Founder and editor-in-chief of MacStories, writing about Apple software, iPad workflows and automation since 2009. He co-hosts the AppStories podcast.

• Arguably still the prettiest task manager ever made, Things finally received the ability to mark repeating tasks as done early. Took a while, but they nailed the implementation.

  culturedcode.com

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Physicist and science communicator. Writes Backreaction and makes videos explaining new physics and astronomy results, frequently to argue that the headline about them overstates the case.

• New Universes Can Form Inside Dying Stars, Physicists Show

  Could our universe have been born inside a collapsing star? That idea recently made headlines, and I got a lot of questions about it. The paper behind them describes a new solution to Einstein's equations in which a col…

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AI research engineer working on large language models. He writes the Ahead of AI newsletter and is the author of Build a Large Language Model (From Scratch).

• Build a Reasoning Model (From Scratch) is now finally also available on Amazon! Thanks so much to everyone who preordered! One important note for readers in India: please avoid ordering through @amazon India (@amazonIN) for now since they are selling counterfeit black-and-white copies. The genuine book is printed in color this time and includes a code for registering the book on Manning’s website. If you are based in India, I recommend ordering directly from Manning. (If you received a counterfeit copy, please return it. I am very sorry about the hassle.) Unfortunately, these counterfeit sale…

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Computer science professor at Georgetown University and author of Deep Work, Digital Minimalism and Slow Productivity; writes about focus, technology and work at calnewport.com and hosts the Deep Questions podcast.

• On AI Coding and Its Discontents

  Back in January, I received a note from a senior software engineer in Silicon Valley. He described himself as an AI skeptic who became converted ...

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Writer living in Brooklyn and former Man Repeller features director; writes the weekly newsletter Maybe Baby on culture and consumption.

• Dear Babies: On navigating aging parents

  Hey, Welcome back to Dear Babies, my monthly follow-up to Dear Baby wherein I pose a question I received for the column to all of you.

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General partner at Andreessen Horowitz from 2013 to 2018 and CTO of Coinbase from 2018 to 2019; co-founder of Counsyl and Earn.com. Wrote The Network State (2022), free in full at thenetworkstate.com, and founded the Network School.

• Network School is not shutting down; that’s fake news. We received two notices. The first tells us to change the text of a sign. The second says that our coworking site, which was created by joining two adjacent units, evidently has a valid license on the left hand side but not the right hand side. We have a remedial period for both issues, and will remediate them shortly. But our members are otherwise unaffected.

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Programmer; founded comma.ai and tinygrad, and was the first to unlock the iPhone.

• AI 2040 and the Cult of Intelligence

  I used to be one of these people. I read Yudkowsky and was like, OMG recursive self improvement hard takeoff AI is coming. Then I joined the real world and actually tried to do things. At comma, we ship a hardware produ…

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Creator of the Zig programming language; president and lead developer of the Zig Software Foundation.

• My Thoughts on the Bun Rust Rewrite

  Context: Rewriting Bun in Rust History When Jarred joined the Zig community about 5 years ago, I described him as someone who had strong "beginner energy". That is, he moved fast and tried a lot of different stuff, jump…

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Swedish open source developer; creator and lead maintainer of curl and libcurl, and a co-founder of the Rockbox project.

• Do excellent vulnerability reports

  Over the years, we have received, read and handled way over one thousand vulnerability reports filed against curl. We have seen most kinds. It is time for me to try to help future reporters by providing a short guide on…

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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.

• I got to spend all day today with Jensen in Taiwan: talking with thousands of engineers and eating street food at a night market. Jensen is received as a rockstar in Taiwan, like it's Beatles in the 60's. It's mind-blowing and fun to watch. But most importantly, through all the interactions and all my conversations with him, he remained the same humble, kind, thoughtful, funny guy he always was, even as a kid who went to these same night markets many years ago. Btw, we tried a crazy amount of different street food. It's legit some of the most delicious food I've ever had. I can't wait to shar…

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Investing columnist for The Wall Street Journal and editor of the revised edition of Benjamin Graham's The Intelligent Investor.

• I joined @JeanChatzky on the @HerMoneyMedia podcast to honor my dear friend, the late @ClementsMoney, and his final book, "Money and Me." We talked about: * why his simple, sound investing philosophy still endures * what his terminal-cancer diagnosis taught him about the meaning of money * why the shift from saving to spending in retirement is so psychologically difficult * what Jonathan's final year, spent eating good food with good friends, can teach us all about living well Listen here:

  lnk.to

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Founding member of OpenAI and former director of AI at Tesla; creator of nanoGPT and the term "vibe coding".

• Personal update: I've joined Anthropic. I think the next few years at the frontier of LLMs will be especially formative. I am very excited to join the team here and get back to R&D. I remain deeply passionate about education and plan to resume my work on it in time.

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Engineering leader and writer; wrote An Elegant Puzzle, Staff Engineer and The Engineering Executive's Primer, and blogs at Irrational Exuberance.

• Judgment and creativity are all you need.

  When I joined Imprint a little less than a year ago, our deploys were manual, requiring close human attention to complete. Our database migrations were run manually, too. Developing good software is very possible in tho…

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Computer performance engineer working on datacenter performance at OpenAI, previously Netflix and Sun/Joyent. Author of Systems Performance and BPF Performance Tools, and creator of flame graphs.

• New blog post: Why I joined OpenAI

  brendangregg.com

  OpenAIRelated

Computer performance engineer working on datacenter performance at OpenAI, previously Netflix and Sun/Joyent. Author of Systems Performance and BPF Performance Tools, and creator of flame graphs.

• Why I joined OpenAI

  The staggering and fast-growing cost of AI datacenters is a call for performance engineering like no other in history; it's not just about saving costs – it's about saving the planet. I have joined OpenAI to work…

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Software entrepreneur who bootstrapped and sold FeedbackPanda and now builds Podscan; writes The Bootstrapped Founder.

• Follow Your Passion (But Not Like That)

  Reading Time: 6 minutesA while ago, I asked my Twitter friends to tell me what the most annoying and most infuriating piece of entrepreneurial advice is that they ever received. And overwhelmingly, “follow your passion”…

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Robert Gray Dodge Professor of Network Science at Northeastern University; discovered scale-free networks and, with Reka Albert, proposed the Barabasi-Albert model.

• Our Nature paper just received 0/10 on Sabine Hossenfelder’s @skdh BS meter.” Yay! "After 40 years, string theory may have finally found its destiny: fruit fly neurons... Fruit flies in 10 dimensions. Go for it." 🎥 https://t.co/d5MKC8HfhS 📄

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Software engineer and writer; former CTO of Wave, now at Anthropic. Blogs at benkuhn.net on attention, engineering management and doing hard things well.

• You know your AI lab is run by physicists when they plot revenue on a log scale

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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.

• AI Evals: Everything You Need to Know

  This document curates the most common questions Shreya and I received while teaching 700+ engineers & PMs AI Evals. Warning: These are sharp opinions about what works in most cases. They are not universal truths. Use yo…

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Design engineer and illustrator; makes visual essays on programming, anthropology and what language models do to the way people write.

• March 2025

  Well, I've had a dramatic start to the year. Normally, the design agency I joined a short eight months ago, unexpectedly closed down in January. Despite running for a decade and working with almost every major tech comp…

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Psychiatrist and clinical assistant professor at Case Western Reserve University. Writes Psychiatry at the Margins on the philosophical and scientific arguments inside psychiatry and the psy-sciences.

• Philosophy of psychiatry: theoretical advances and clinical implications

  Work at the intersection of philosophy and psychiatry has an extensive and influential history, and has received increased attention recently, with the emergence of professional associations and a growing literature. In…

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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.

• Generalist AI doesn't scale

  There has been a lot of talk about AI recently, and one particular point has received sigificant attention in the tech industry: The cost of training models. According to some insiders — and the market capitalizat…

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Founder of the toy manufacturer Viahart; writes about manufacturing, importing and why bringing production back to America is harder than it sounds.

• Amazon’s Pricing Policies Promote Inflation

  The state of California has sued Amazon in what may be the biggest antitrust case for 25 years, when 20 states joined the US Department of Justice to sue Microsoft. These cases revolve around whether consumers are harme…

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Executive coach for product leaders. Previously a partner at GV (Google Ventures) and a product manager at Google. Writes at Bring the Donuts, including a standing essential-reading list for product managers.

• Ken Norton on the Product Thinking Podcast

  Leading with vision and purpose - I joined Melissa Perri’s Product Thinking Podcast to talk about the evolution of product management, the stark difference between empowered and unempowered product teams,and why ultimat…

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Executive coach for product leaders. Previously a partner at GV (Google Ventures) and a product manager at Google. Writes at Bring the Donuts, including a standing essential-reading list for product managers.

• Ken Norton on Lenny’s Podcast

  Making the shift from reactive to creative leadership - I joined Lenny’s Podcast to talk about coaching, product leadership, and the transition from reactive to creative. Listen to the audio or watch the video at the bo…

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Brazilian-American staff software engineer working on platforms, AI and developer productivity. Writes about engineering and his setup at ivansantos.me.

• When did AirBNB get more expensive than hotels? Lol, I think I’ve not received the memo :P

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Web developer; former head of engineering at Flickr, author of Building Scalable Web Sites, and co-founder and CTO of Slack.

• After 12+ years of being an independent company, today Slack joined Salesforce. Together, we’re going to do great things. Let’s go!
  Quoting@btaylorFor me personally, the most exciting thing is the opportunity to work with @stewart, @iamcal, and @TYehoshua every day. Lots of entrepreneurs set out to change the way we work; few do. What a privilege to work with the best product designers in enterprise software!

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Web developer; former head of engineering at Flickr, author of Building Scalable Web Sites, and co-founder and CTO of Slack.

• Some amazing leaders have joined @SlackHQ! Welcome, Fuzzy Khosrowshahi, Product Eng VP; @Rukmini_Reddy, Platform Eng VP; and Sean Catlett, CSO. To hear more about the future of Slack that we’re building together, join us for Frontiers 2020, tomorrow:

  slack.com

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Physicist and science communicator. Writes Backreaction and makes videos explaining new physics and astronomy results, frequently to argue that the headline about them overstates the case.

• Rethinking Superdeterminism

  Quantum mechanics has irked physicists ever since its conception more than 100 years ago. While some of the misgivings, such as it being unintuitive, are merely aesthetic, quantum mechanics has one serious shortcoming:…

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Author and clean-energy analyst who writes on solar cost curves.

• Yes, Blockchain Can Help Us Solve Climate Change – Why I Joined Nori

  Over the last two years, as both an angel investor and a public speaker on energy and climate, I’ve looked at least a few dozen startups and proposals on how to use blockchain or new crypto coins in energy or climate.

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General partner at Benchmark Capital for over two decades; was the lead analyst on Amazon's IPO before moving into venture capital. Writes Above the Crowd on tech and marketplace economics.

• Benchmark’s Newest General Partner Chetan Puttagunta

  The partners at Benchmark are pleased to announce Chetan Puttagunta has joined the firm as our newest General Partner. As early-stage investors, we are acutely aware of the work of other venture capitalists on the board…

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Founding member of OpenAI and former director of AI at Tesla; creator of nanoGPT and the term "vibe coding".

• (started posting on Medium instead)

  The current state of this blog (with the last post 2 years ago) makes it look like I’ve disappeared. I’ve certainly become less active on blogs since I’ve joined Tesla, but whenever I do get a chance to post something I…

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Founding member of OpenAI and former director of AI at Tesla; creator of nanoGPT and the term "vibe coding".

• A Survival Guide to a PhD

  This guide is patterned after my “Doing well in your courses”, a post I wrote a long time ago on some of the tips/tricks I’ve developed during my undergrad. I’ve received nice comments about that guide, so in the same s…

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Founder and CEO of Wolfram Research, creator of Mathematica and Wolfram|Alpha, and author of A New Kind of Science.

• Symbolic mathematical computation

  Standard programming languages are inadequate for the kind of symbolic mathematical computations that theoretical physicists need to perform. Higher mathematics systems like SMP address this problem.

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