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Web infrastructure engineer and standards editor; chaired the IETF HTTP working group and co-authored core HTTP and Atom specifications.

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Mathematical physicist at UC Riverside. Wrote This Week's Finds in Mathematical Physics and now the Azimuth blog on mathematics, physics and environmental science.

• The social scene around AI and AI safety is more unpleasant than I realized. I'm sure there are other sides to it. But when you get a lot of men with too much money who think they're saving the world, surrounded by groupies, what do you expect? Read the long Bluesky thread about this, collected on one page: https://skywriter.blue/@segyges.bsky.social/3mvom4b4dn22q I can't confirm this stuff - I stay far away from this scene. And the sentence "AI Safety is Mostly a Sex Cult" is a massive exaggeration. But... (1/n)

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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).

• mlxtend — A library of extension and helper modules for Python's data analysis and machine learning libraries.

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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.

• fastconstmap — Fast, immutable, compact map from strings to 64-bit integers — for Python.

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Programmer, photographer and musician, best known for the Python Requests HTTP library and other Python tooling.

• Experimenting with making a little portable Requests–inspired Python module, called https://t.co/gzrf4pmNOY. Just for fun.

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Creator of the Keras deep-learning library and the ARC-AGI benchmark.

• > One could even define intelligence as the efficiency with which one converts experience into competence; by this definition they lag very far behind us Yes, one could define intelligence in this way, and one would be right. By this metric current AI is approximately 6 OOMs less intelligent than humans. Your ancestors' evolutionary history did not prepare you for Python programming, yet you can learn to competently program in Python in a few hundreds of hours. An LRM needs the training data equivalent of ~1B hours (on top of all of its non-programming related training data). Another dimensio…
  Quoting@DKokotajloDan Selsam is a current OpenAI capabilities researcher. (since 2022) He was my boss for a while. He doesn't have a twitter account but has made this public statement of his views on AI risk and sent it to me to share: Dan Selsam's Personal Statement on AI Risk: I have been working on AI for over fi…

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Web infrastructure engineer and standards editor; chaired the IETF HTTP working group and co-authored core HTTP and Atom specifications.

• pyproject-tmpl — Template for Python projects

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CEO of Vercel; creator of Next.js and Socket.IO. Writes at rauchg.com.

• I’m seeing teams at Vercel iterate just as fast on Zig, Go, Rust projects as TypeScript & Python ones. The days of language or runtime choice based on human convenience are over. Agents are the new compilers. They compile intent into fast software.

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Machine learning engineer and consultant focused on RAG and retrieval systems. He writes about applied AI engineering at jxnl.co and is the author of the instructor library.

• mf be like "it came to me in a dream" and its actually just 10 000 agent swarms writing markdown files on a sandbox and some python code

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Programmer, photographer and musician, best known for the Python Requests HTTP library and other Python tooling.

• Making a Python interpreter in 1024 bytes

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Creator of Flask and Jinja. Writes about software at lucumr.pocoo.org.

• Astra for Coding: Why Are We Doing This Again?

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Writer and programmer; co-founder of the software studio Postlight and author of the Bloomberg Businessweek essay What Is Code?

• Bluesky provides a mobile web view that runs great on my four-year-old phone and never pushes me to download an app. That is special and appreciated and I hope it continues.

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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.

• Python sets and dictionaries can have quadratic-time performance

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Software engineer and engineering leader at Canonical, working on Ubuntu; writes about his homelab, Nix and tooling at jnsgr.uk.

• pytouchlinesl — A Python API client for Roth's TouchlineSL API

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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).

• A little video that - explains the relationship between conventional LLMs and reasoning models (and agents), - philosophizes a about "from scratch" approaches, - and explains how to install Python & PyTorch requirements with uv.

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Programmer, photographer and musician, best known for the Python Requests HTTP library and other Python tooling.

• noodler — A modular music environment where theory itself is patchable. Eurorack-inspired, built in Python around PyTheory.

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Web developer and writer; an early GitHub employee, author of speaking.io and of widely read essays on startups and product.

• finally succumbed to the bluesky custom domain vanity url

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Web infrastructure engineer and standards editor; chaired the IETF HTTP working group and co-authored core HTTP and Atom specifications.

• http-sf — HTTP Structured Fields for Python

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Co-founder of WordPress and founder of Automattic; blogs at ma.tt.

• Toni on Verge

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Writer and developer; runs Waxy.org, co-organises the XOXO festival, and was the first CTO of Kickstarter.

• Monty Python and the Holy Grail, in alphabetical order: the latest submission to Supercut.org, inspired by Of Oz The Wizard

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Programmer, photographer and musician, best known for the Python Requests HTTP library and other Python tooling.

• responder — A familiar HTTP Service Framework for Python.

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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.

• Production ML-DSA Verification in 350 Lines of Python

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Data scientist and machine-learning researcher; chief scientist at bitly, founder of Fast Forward Labs and Hidden Door.

• Help me bluesky — What’s the easiest way for me, a plant dummy, to grow these herbs at home? I love cooking with fresh herbs and hate not trusting my produce.

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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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Programmer and writer; co-wrote The Rust Programming Language and worked on Rust's documentation for years.

• Too many words about DIDs

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Freelance web developer and instructor. Author of the Dive Into Docker course; writes tutorials on Docker, deployment and development environments at nickjanetakis.com.

• It's sad to see trillion dollar AI companies end the careers of course creators. David has been making Python courses for 20 years and he just called it quits. https://t.co/09rHvd17i6 I've been doing it for 10 years and I'm at an impasse. Traffic is dead, I operate at a loss.

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Programmer, photographer and musician, best known for the Python Requests HTTP library and other Python tooling.

• interpretations — A new album, written in Python.

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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.

• the next version of Python is going to have a built in sampling profiler!!!! this is so exciting to see

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• exciting to read about this work on rv, uv has made Python so much easier for me
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Software developer and entrepreneur; co-founder of Heroku, author of The Twelve-Factor App, and a researcher at Ink & Switch.

• x.comI wrote a custom Bluesky feed! It's a classifier trained my past likes. As a bonus, I got to learn more about recommender systems ("RecSys").

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• SiteA Bluesky feed for one

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Technical educator, conference speaker and developer relations engineer based in Ottawa, Canada. Author of the Anubis bot filter and of over 400 articles at xeiaso.net.

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Freelance web developer and instructor. Author of the Dive Into Docker course; writes tutorials on Docker, deployment and development environments at nickjanetakis.com.

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Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.

• People get confused when language implementations break language guarantees

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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).

• mini-coding-agent — Minimal and readable coding agent harness implementation in Python to explain the core components of coding agents.

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

• microgpt

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American software engineer; worked on code-server at Coder and teaches TypeScript and open-source contribution. Publishes at joeprevite.com.

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Founded PSPDFKit in 2011 and ran it for a decade. Came back from a break to work on AI agents — the OpenClaw project, and OpenAI, joined in February 2026. Writes at steipete.me.

• This post was a massive success so wanna repost it here. Dunno if BlueSky is now more open for these topics?

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British senior engineering manager at Netlify, previously a team lead at the BBC; writes about JavaScript testing, chatbots and serverless at marclittlemore.com.

• MastodonTesting out an update to my notes automation and hoping that this will now have a thumbnail on Bluesky. Check out the Cooking Soul "A Tribe Called Christmas" mixtape as it's wonderful.

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• BlueskyTesting out an update to my notes automation and hoping that this will now have a thumbnail on Bluesky. Check out the Cooking Soul "A Tribe Called Christmas" mixtape as it's wonderful.

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Irish independent game developer, maker of VVVVVV, Super Hexagon and Dicey Dungeons.

• Egg

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Creator of the Keras deep-learning library and the ARC-AGI benchmark.

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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.

• The ITTAGE indirect branch predictor

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Programmer and writer; co-wrote The Rust Programming Language and worked on Rust's documentation for years.

• Thoughts on Bluesky Verification

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Machine learning engineer working on recommender systems, personalization and information retrieval. Previously worked on LLMs and LLM infrastructure at Mozilla.ai and on ML and recsys at Duo, Tumblr, Automattic and Comcast; wrote the 'What are embeddings?' text and ran the Normconf conference.

• gitfeed — Feed of posts from Bluesky that have a GitHub link

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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.

• Performance of the Python 3.14 tail-call interpreter

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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.

• BlueskyOAuth — A sample project that uses OAuth on Bluesky

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Machine learning engineer working on recommender systems, personalization and information retrieval. Previously worked on LLMs and LLM infrastructure at Mozilla.ai and on ML and recsys at Duo, Tumblr, Automattic and Comcast; wrote the 'What are embeddings?' text and ran the Normconf conference.

• You can just hack on ATProto

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Machine learning engineer working on recommender systems, personalization and information retrieval. Previously worked on LLMs and LLM infrastructure at Mozilla.ai and on ML and recsys at Duo, Tumblr, Automattic and Comcast; wrote the 'What are embeddings?' text and ran the Normconf conference.

• How FastAPI path operations work

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Game developer, formerly at Looking Glass Studios, and author of the stb single-file public-domain C libraries used across the games industry.

• wikiplot — python scripts for extracting plot summaries from wikipedia

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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.

• New microblog with TILs

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Machine-learning researcher on open language models; writes the Interconnects newsletter and the RLHF Book, after leading post-training at Ai2.

• blogcaster — Python tools for easily translating your blog content to podcasts & YouTube

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Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.

• Toolbox languages

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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.

• PowerEdit — A super-minimal Python-based video editor ⚡

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Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.

• python-collab-template — 🛠 Python project template with unit tests, code coverage, linting, type checking, Makefile wrapper, and GitHub Actions.

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Creator of the Keras deep-learning library and the ARC-AGI benchmark.

• keras-resources — Directory of tutorials and open-source code repositories for working with Keras, the Python deep learning library

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Interpretability researcher at Anthropic, which he co-founded; before that at OpenAI and Google Brain, where he wrote the explanations of neural networks most people learned them from.

• surfcad — Surface-Oriented CAD Library for Python

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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.

• I am starting a new journey where I play with LLMs while refusing to touch Python. Wish me luck, let’s see how far I can get lol

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Software engineer who worked on Chrome and Polymer at Google, and writes about the web, emoji and Elm at meowni.ca.

• Y’all better not ruin bluesky before I get an invite

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Programmer; co-founded GitHub and was its CEO, and created the Mustache templating language and Resque.

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

• A from-scratch tour of Bitcoin in Python

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Creator of the Keras deep-learning library and the ARC-AGI benchmark.

• nelder-mead — Pure Python/Numpy implementation of the Nelder-Mead algorithm.

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Engineer and writer on machine-learning systems; author of Designing Machine Learning Systems and AI Engineering. "I work to bring AI into production. I write about AI system design."

• python-is-cool — Cool Python features for machine learning that I used to be too afraid to use. Will be updated as I have more time / learn more.

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Data scientist and machine-learning researcher; chief scientist at bitly, founder of Fast Forward Labs and Hidden Door.

• introbot — A python script to generate the text of intro e-mails.

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Data scientist and machine-learning researcher; chief scientist at bitly, founder of Fast Forward Labs and Hidden Door.

• randomness_beacon — A python module for using the NIST randomness beacon, generating 512-bits of randomness every 60 seconds

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Data scientist and machine-learning researcher; chief scientist at bitly, founder of Fast Forward Labs and Hidden Door.

• botomatic — easily create twitter bots in python

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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.

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Machine-learning researcher; has written the Lil'Log survey posts on how a model technique works since 2017, and worked at OpenAI from 2018 to 2024, latterly leading its safety systems team.

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