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Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.

• Quoting voxium

  It has been half a month since I started a new role at a big company. Nobody knows anything here. The specs, code, tests, PRDs, tickets, resolution of those tickets, reports, etc., everything is made by Claude Code. Nob…

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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.

• Code-used-on-Daniel-Lemire-s-blog — This is a repository for the code posted on my blog

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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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Former L8 engineer at Meta, Microsoft and Atlassian, now writing and building solo on agentic engineering. Writes Kun's Field Notes and posts a lot about AI coding agents on X.

• treehouse — Manage worktrees without managing worktrees.

  Commitsfix(config): warn when repository hooks are ignored (#141) · feat(pool): seed ignored files from .worktreeinclude (#129)

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Writer of kottke.org, one of the oldest blogs on the web, published since 1998 and supported by its members. He writes about art, technology, science, design and visual culture.

• Bluesky“Szilveszter Makó’s surreal portraits have become nearly as recognisable as the celebrities he photographs.” But: “Artists who become successful for a signature style are then accused of monotony for being hired to reproduce it.”

  itsnicethat.com

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• Mastodon“Szilveszter Makó’s surreal portraits have become nearly as recognisable as the celebrities he photographs.” But: “Artists who become successful for a signature style are then accused of monotony for being hired to reproduce it.”

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• Blog“Szilveszter Makó’s surreal portraits have become nearly...

  recognisable as the celebrities he photographs.” But: “Artists who become successful for a signature style are then accused of monotony for being hired to reproduce it.”

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Standards editor known as Hixie; edited the HTML and WHATWG living standards for many years and worked on Flutter at Google.

• contraptions — Tools to connect public services like GitHub and Discord

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Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.

• Self-generated prompt injections in compaction summaries

  In Our framework for reporting model misalignment OpenAI provide "six reports on unexpected or concerning model behavior we’ve observed in the last six months". This one here is my favorite: they caught some of their mo…

  AI alignmentOpenAIRelated

Software design writer and chief scientist at Thoughtworks; wrote Refactoring and Patterns of Enterprise Application Architecture.

• Fragments: September 16

  Reports of agentic hacking continue, in this case it happened back in May and it seems OpenAI did not disclose that they were responsible. Simon Willison sees two options: After the Hugging Face and Wiki attacks OpenAI…

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Machine-learning researcher at Cursor working on post-training for coding models; a professor at Harvard and then Cornell from 2016 to 2026, and a researcher at Hugging Face from 2019 to 2024.

• New repolean-transformer — Blog on formalizing key transformer invariants.

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

• Fastly reports they see requests with #curl in the user-agent at roughly 7 million requests/sec.

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Author and journalist writing on food, plants and consciousness. Professor at UC Berkeley and co-founder of its Center for the Science of Psychedelics.

• The Microdose Reports on yesterday's FDA’s hearing on psychedelic drugs

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Software engineer who writes the blog Made of Bugs about performance, debugging and understanding computer systems. Previously worked at Anthropic on interpretability, at Stripe on Sorbet, and at Ksplice.

• nelhage-sandbox — Sandbox repository for experimentation and small toy projects

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Venture capitalist and founder of Theory Ventures, previously a partner at Redpoint. Writes a near-daily blog on startups, SaaS metrics, data and AI.

• When Inbound Sells Itself

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• bunch — Documentation repository for Bunch.app

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Cognitive scientist and long-standing critic of deep learning's claims; writes Marcus on AI and wrote Rebooting AI.

• OpenAI’s Egregious Pattern of Misconduct

  Nine troubling new reports in seven days

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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.

• x.comI looked at the reports about the OpenAI/Huggingface incident and I think we're not talking enough about the most worrisome part

  youtube.com

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• BlogThe Hugging Face Hack Was Much Worse Than I Thought

  I looked at the reports about the OpenAI/Huggingface incident and I think we're not talking enough about the most worrisome part

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Indonesian software engineer, educator and engineering manager at Zero One Group; open-source enthusiast writing at ripandis.com.

• StyleX (@stylexjs) is currently a hot topic. If you need a React project boilerplate that comes ready with StyleX and shadcn-style composable UI components, you can visit this repository:

  github.com

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Writer and developer. He runs the Latent Space newsletter and podcast about AI engineering, and writes essays on software and careers at swyx.io.

• sorry for the radio silence folks - got sucked into extreme LLM psychosis. but i can confidently say we have crossed over into a new age of AI Engineering and we are never, ever, looking back. this isnt even EVERYTHING i did with Astra but i'll append more reports as I publish them on LS!
  Quoting@latentspacepodWe spent >20B tokens throwing @openai's Astra at every AI Engineering task we could think of, beyond cute Blender demos and fun games. https://t.co/QoW6YBybA4 Here's everything Astra can do, and do so at <$6 an hour (serious): - choose and train models - label data (both helping you label and then…

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

• ca-bundle — The Mozilla CA bundle extracted and converted to PEM. This repository functions as a backup to the automated service on the curl web site.

  Commitsupdate from 2026-08-13

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Software design writer and chief scientist at Thoughtworks; wrote Refactoring and Patterns of Enterprise Application Architecture.

• An Accidental Blackboard

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Investor and writer. Previously a partner at Andreessen Horowitz and a product leader at Twitter, Facebook, Snap and Microsoft. Writes essays and memos at sriramk.com.

• really impressed with the quality of work from @RyanGreenblatt , @METR_Evals and @OpenAI to investigate the HuggingFace incident. Both reports are recommended reading.

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Mathematician and Senior Lecturer in the Mathematics department at Columbia University. Author of the book Not Even Wrong and of the long-running physics blog of the same name.

• This Week’s Hype

  The Economist today reports that New theories and experiments should shine light on string theory. This is more of the promotional campaign for Cumrun Vafa’s “dark dimension”. We’re told that a torsion balance experimen…

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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’ve been using claude for all things home-related and it’s amazing. (just dump all files in and let claude index, summarize, and organize.) even better than being a repository of all receipts, it helps me maintain a spreadsheet that i can download and send to accountants, draft emails for correspondence with service providers, and proactively flag issues that i wouldn’t have realized otherwise.
  Quoting@money_cruncherOpen a new gmail as soon as you buy a house (123house@gmailcom) Then save/forward every single receipt, invoice, quote etc to this email for all your home improvements: - replacing an entire roof - new flooring - new hvac system - building a new deck - etc These improvements raise your cost basis,…

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Scottish software developer on the Statamic core team; runs a one-person business maintaining Statamic addons such as Runway and writes at duncanmcclean.com.

• Before releasing Cargo earlier this year, I thought I was gonna hire someone to help me keep up with bugs & feature requests. Today, I barely look at bug reports. I point Claude at the issue, it opens a PR, and after a quick review I ship it. 🚀

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Statistician and Chief Scientist at Posit (RStudio). Author of the ggplot2, dplyr and tidyverse R packages and of books on R programming and data science.

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Staff writer at The New Yorker, where he writes the Infinite Scroll column, and author of Filterworld and The Longing for Less.

• It’s very manly to allocate capital to the places it will reproduce the fastest

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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).

• Just saw that the LLMs-from-scratch repository passed 100,000 stars on GitHub! This is super cool and motivating. I am really happy to see that this open-source repo has helped so many people. Thanks also to everyone who shared ideas and opened PRs with improvements! Of course, I plan to keep adding new material, including new attention variants and architectures (while bigger projects like RL and Reasoning From Scratch live in their separate repositories). I am also currently working on a larger applied custom “small” LLM project. It has been keeping me super busy this month, but I will shar…

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China economy researcher based in Beijing who writes on his personal blog about Chinese political economy, history, books and music.

• Li Daokui's comments are important because there are so few domestic voices in China stating what (I think) is the obvious truth about the economy: the main problem is that aggregate demand is weak, growth is running below potential and macro policies are inappropriate. This is not a novel, original or unusual insight: it's what lots of people (myself and others) have been saying for years, and is also in the most recent of the much-maligned IMF reports on China. But it runs directly contrary to the official government diagnosis which is that aggregate demand is fine and the economy mainly su…

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Full-stack Laravel developer based in Madison, Wisconsin; maintains open-source Laravel, Livewire and Alpine.js packages and writes at randallwilk.dev.

• rawilk — My personal GitHub repository

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Organizational psychologist and professor at the Wharton School. Author of Give and Take, Originals, Think Again and Hidden Potential, host of the Re:Thinking podcast, and writer of the GRANTED newsletter.

• Hybrid work doesn't just boost productivity. It leads us to reproduce more too. Economists find that when remote work opportunities rise, fertility rates do too. For every 3 couples that work from home at least a day a week, an extra child is born. Flexibility is pro-family.

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

• 1,500 curl authors

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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).

• python-machine-learning-book — The "Python Machine Learning (1st edition)" book code repository and info resource

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Investigative journalist on policing, forensics and criminal justice; wrote Rise of the Warrior Cop and writes The Watch.

• A guide to racism in the criminal justice system

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Software engineer, Wikipedia editor and crypto critic; writes Citation Needed and runs Web3 is Going Just Great.

• Trump’s $1.4 billion crypto disclosure

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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

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Security researcher; built Report URI and Security Headers, and writes about web security in practice.

• A dead CDN, a wildcard, and an attack waiting to happen: the netdna-ssl.com takeover

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Cryptography engineer; maintains Go's cryptography libraries as a full-time open-source maintainer, funded directly by companies that use them.

• Vulnerability Reports Are Not Special Anymore

  We needed the insight and confidentiality to protect our users, but now that anyone can get the same results from LLM?

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Italian software architect working on Microsoft 365, Azure and GitHub tooling. Microsoft MVP and GitHub Star; writes, speaks and streams about developer productivity at emanuelebartolesi.com.

• demo-workflow-syntax — Demo repository for basic GitHub Actions workflow syntax.

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• skills-secure-repository-supply-chain — Mona here. I'm done preparing your exercise. Hope you enjoy! 💚

  CommitsUpdate README.md · Initial commit

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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).

• machine-learning-book — Code Repository for Machine Learning with PyTorch and Scikit-Learn

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Programmer; wrote Redis and hping, and blogs about C, systems programming and working alone.

• Redis array type: short story of a long development

  I started working on the new Array data type for Redis in the first days of January. The PR landed the repository only now, so this code was cooked for four months. I worked at the implementation kinda part time (kinda…

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Writer and education-technology critic; published Hack Education for a decade and wrote Teaching Machines.

• audreywatters.com — This repository powers the Audrey Watters website

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Programmer known online as technomancy; author of Leiningen, the Clojure build tool, and a maintainer of the Fennel programming language.

• in which more paths are charted towards code independence

  As the ninth anniversary approaches of the last project repository I created on Github, it's been so encouraging to see more and more projects migrate away from Microsoft Github. I love seeing the rise of Codeberg, not…

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Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• piday — Initial repository for piday.

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Mathematician at UCLA, working mainly in harmonic analysis and partial differential equations. Writes What's new, a long-running blog on their research, open problems and expository notes.

• A #cosmicdistanceLadder post on the many ways we project our planet onto a plane. No projection can faithfully reproduce *all* the geometric features of a sphere, so each projection is a compromise; but some projections are still preferred for specific applications.

  instagram.com

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

• nanoGPT — The simplest, fastest repository for training/finetuning medium-sized GPTs.

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Mac and iOS developer at the Iconfactory, where he has worked on apps including Twitterrific and Tot. He writes about development at furbo.org.

• BeanCounter — A Mac app to keep track of iTunes Connect financial reports

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Mathematician at UCLA, working mainly in harmonic analysis and partial differential equations. Writes What's new, a long-running blog on their research, open problems and expository notes.

• My thoughts on the crucial importance of methodology on self-reported AI performance on mathematics competitions, and my policy on commenting on such reports going forward:

  mathstodon.xyz

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Energy and decarbonisation analyst; publishes an annual chart deck on the state of the transition, and was chief content officer at BloombergNEF.

• Tariff Stochasticity

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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.

• craftinginterpreters — Repository for the book "Crafting Interpreters"

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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.

• bpf-perf-tools-book — Official repository for the BPF Performance Tools book

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Software engineer who writes the blog Made of Bugs about performance, debugging and understanding computer systems. Previously worked at Anthropic on interpretability, at Stripe on Sorbet, and at Ksplice.

• I am slowly trying to figure out Nix/NixOS. I just realized something I'm very confused by: Is it really the case “pinning’ in NixOS prototypically means “pinning a single version of the entire package repository, and then pulling in whatever versions it contains”? I mean, "it's all just code" and it seems to be *possible* to mix and match via `fetchTarball`. But is pinning the universe as-a-unit really the normal pattern?

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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.

• Superfluid dark matter in tension with weak gravitational lensing data

  Superfluid dark matter (SFDM) is a model that promises to reproduce the successes of both particle dark matter on cosmological scales and those of Modified Newtonian Dynamics (MOND) on galactic scales. SFDM reproduces M…

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Research scientist at Meta in Berlin working on multilingual models and evaluation; led the multilingual team at Cohere and was a research scientist at Google DeepMind before that.

• sebastianruder — Repository for my personal website

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Writer and education-technology critic; published Hack Education for a decade and wrote Teaching Machines.

• teachingmachines — This repository powers the Teaching Machines website

  CommitsUpdate

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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.

• twirpdemo — An example repository of using the Twirp RPC framework with Go

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Founder and chief executive of Replit. Previously an engineer at Facebook and Codecademy. Writes essays on programming, philosophy and entrepreneurship at amasad.me.

• github-slideshow — A robot powered training repository :robot:

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Writer and education-technology critic; published Hack Education for a decade and wrote Teaching Machines.

• isaiah — This repository powers the kid's website

  Commitsmore edits · update

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Research scientist at Meta in Berlin working on multilingual models and evaluation; led the multilingual team at Cohere and was a research scientist at Google DeepMind before that.

• cv — Repository for my CV

  CommitsUpdated CV

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Writer and education-technology critic; published Hack Education for a decade and wrote Teaching Machines.

• education-futurism — This repository is a placeholder for Education Futurism

  CommitsUpdate author image · Delete CNAME and updated README

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Novelist and writer, author of Mr. Penumbra's 24-Hour Bookstore and Sourdough; previously worked at Twitter and Current TV.

• penumbra-primes — This repository contains the results of an odd prime number game.

  CommitsPrimes online · Initial commit

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Rust engineer at Google working on Android; maintains Tokio and works on Rust in the Linux kernel.

• Backblaze B2 Rust library

  This page functions as a home page for my rust library backblaze-b2. Here are some links to the project: crates.io Documentation Git repository

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Mac and iOS developer; created NetNewsWire and MarsEdit, co-created the JSON Feed format, and blogs at inessential.com.

• vesper-api — Vesper’s API server.

  CommitsChange 'repository' to 'folder' in the README, so that it's clear that this repo doesn't… · Update README with link to notes on my blog. · Update README with notes about where this code ran.

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Research scientist at Meta in Berlin working on multilingual models and evaluation; led the multilingual team at Cohere and was a research scientist at Google DeepMind before that.

• research_interests — Repository with a brief sketch of my research interests

  CommitsAdded file with current research interests

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Danish Mac developer; author of the TextMate text editor and founder of MacroMates.

• rdar — Apple Bug Reports

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