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Chris Wellons
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pdjson — C JSON parser library that doesn't suck
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20 September
Web infrastructure engineer and standards editor; chaired the IETF HTTP working group and co-authored core HTTP and Atom specifications.
Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.
18 September
Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.
Faster JSON parsing with SVE2 on ARM processors ARM processors, like those in your phone, have instructions capable of processing several elements at once (SIMD). These instructions are called NEON. But many newer processors have a different SIMD extension called SVE…
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Engineer at Vercel Labs as of 2026. Ships a steady stream of small developer tools — agent-browser, portless, json-render, native-sdk, the v0 SDK — and lists every one of them at ctate.dev.
New experiment: json-render + jev The future Generative UI is instant Your components, your actions, your design system Rendered in milliseconds Related
Creator of Flask and Jinja. Writes about software at lucumr.pocoo.org.
I'm so suck of LLM generated replies on Twitter. I stopped replying almost entirely to my replies on my own Tweets because I expect all of them to just be LLM slop. Why are y'all doing this? LLMs Related
17 September
Swedish open source developer; creator and lead maintainer of curl and libcurl, and a co-founder of the Rockbox project.
Between all the vulnerability report work, I made curl's date parser twice as fast as before... curl.se
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15 September
Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.
A new fast_float release... fast_float is a super fast number parser in C++ (used by GCC, MySQL, your browser...). The latest release adds support for parsing numbers following the JavaScript standard, so things like 05.1 can be accepted (!!!). JavaScript Related
14 September
Engineer at Vercel Labs as of 2026. Ships a steady stream of small developer tools — agent-browser, portless, json-render, native-sdk, the v0 SDK — and lists every one of them at ctate.dev.
Introducing Vercel Labs Tools for devs in the AI era agent-browser, skills, json-render, deepsec, fx, just-bash, portless, vgpu and more We experiment in public: ship early, learn from feedback, and keep working on what people find useful We've been shipping under the Labs name for a while. Now, Labs is an official team at Vercel focused on exploring new capabilities and primitives that change what developers and agents can do. Here's what to expect: → Labs products: maintained, supported, built to be relied on → Active experiments: moves fast, expect rough edges and breaking changes → Past e… vercel.com
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11 September
Philosophy professor at UC Berkeley and creator of pandoc, the universal document converter, and of the CommonMark markdown specification.
9 September
Founder and CEO of Social Capital, a venture firm; co-host of the All-In podcast and an early Facebook executive. Writes an annual letter and a weekly newsletter on markets and technology.
Hi guys, I’m going to start a company. It will be important. But it will also suck. It will be valuable. But will leave death and destruction in its wake. It will be transformational. But it will destroy society as we know it. So bottom line, please buy my company’s product. You can count on us! Thank you. Related
Co-founder and CEO of OpenAI; previously president of Y Combinator.
This would suck, but we will prioritize great service for customers until we can get back on top of things. Quoting @thsottiaux Demand for Astra is really unprecedented. We're pulling all the levers possible to sustain the demand, but I've not seen anything like it until now and we went through very steep growth before. Priority will always be to keep excellent service for existing users, but we might have to pause new Pro… Related
7 September
Mac and iOS developer; founder of Red Sweater Software (MarsEdit, FastScripts) and co-host of the Core Intuition podcast.
Oh hey everybody, I just remembered I keep receipts on the worst people who ever interact with me. Please don't forget that Vandad Nahavandipoor (@VandadNP) is a guy who thought it was OK to assure me that I would suck Trump's dick. Quoting @danielpunkass Speaking of dingalings. I want to remind everybody that you should never, ever, ever, work with Vandad Nahavandipoor (@VandadNP). He's a bad guy. Related
Creator of Claude Code at Anthropic.
1 September
Software engineer and engineering leader at Canonical, working on Ubuntu; writes about his homelab, Nix and tooling at jnsgr.uk.
29 August
Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.
16 August
Engineer at Vercel Labs as of 2026. Ships a steady stream of small developer tools — agent-browser, portless, json-render, native-sdk, the v0 SDK — and lists every one of them at ctate.dev.
Their words
New in json-render: Named Slots Generative UI with more structure
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x.com
29 July
Co-founder of Sundial; former vice president of product design at Facebook; author of The Making of a Manager; writes The Looking Glass.
I'm impressed with Claude Design. I see its disruption starting with smaller teams. As a founder I find myself turning to it more and more for the convenience of one-off design tasks. Sure, it's super slow, and one-shot quality is not quite there, and its image capabilities suck, but using it in between multi-tasking other things, it's helping me move faster. As @HarryStebbings says the "all-in-one" Claude interface has a huge psychological advantage as being the place people are already working. I don't think it's a great tool yet for a designer-designer (the speed / control dials are not ye… Quoting @HarryStebbings Why we switched from Figma to Claude Design “I let the team do whatever is best for them, and this is a trend I've observed amongst almost everybody: Claude Design has done a great job. People really like using it, it's easy to use, and we've had a natural movement towards it. It's also easier to n… Anthropic Related
23 July
Dutch bootstrapper who builds and runs their internet startups alone — Nomads.com, Remote OK, Hoodmaps, Photo AI and Interior AI — and has written about it at levels.io since 2013. Posts as @levelsio.
Their words
matic vacuum (they gave me one so I have to disclose but it's GREAT, all the Roomba and Chinese ones suck)
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levels.io
Their words
matic vacuum (they gave me one so I have to disclose but it's GREAT, all the Roomba and Chinese ones suck)
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levels.io
13 July
Programmer on the Dart language at Google and author of Game Programming Patterns and Crafting Interpreters; previously a game developer at EA.
It is the year 2040. After the AI Wars of the 2030s, only two programming languages remain: JSON and Markdown. Related
25 June
Moroccan senior frontend developer writing at smakosh.com; builds side projects and client work under Smakosh LLC.
10 June
Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.
Nontrailing separators do not spark joy This is valid JSON: { "a": 1, "b": 2, "c": 3 } This is invalid JSON: { "a": 1, "b": 2, "c": 3, } The difference is the last comma. The JSON grammar specifies that a comma can separate two members of an object but not po…
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23 April
Demographer; writes on fertility, marriage and population, and directs the Pro-Family Initiative at the Institute for Family Studies.
20 April
Canadian full-stack web developer who makes JavaScript and CSS video courses and co-hosts the Syntax podcast.
18 April
Mac and iOS developer; created NetNewsWire and MarsEdit, co-created the JSON Feed format, and blogs at inessential.com.
16 April
London-based front-end architect, web developer evangelist and cloud consultant; Microsoft MVP. Writes at praveen.science and answers on Stack Overflow.
Just awesome! 🤩 20 years later and meeting Douglas Crockford, the creator of JSON again! ❤️🔥 #JSON #Achievement #Grateful #Career Related
7 April
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.
dcmake: a new CMake debugger UI CMake has a --debugger mode since 3.27 (July 2023), allowing software to manipulate it interactively through the Debugger Adaptor Protocol (DAP), an HTTP-like protocol passing JSON messages. Debugger front-ends can star…
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7 March
Ruby and Rails core committer known online as "tenderlove"; maintains Nokogiri and works on Ruby performance.
26 November 2025
Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.
Their words
I’ve got a GitHub actions thing that runs a piece of software I wrote called shot-scraper that runs Playwright, that loads up a browser in GitHub actions to scrape that webpage and turn the results into JSON, which then get turned into an atom feed, which I subscribe to in NetNewsWire.
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simonwillison.net
Their words
I’ve got a GitHub actions thing that runs a piece of software I wrote called shot-scraper that runs Playwright, that loads up a browser in GitHub actions to scrape that webpage and turn the results into JSON, which then get turned into an atom feed, which I subscribe to in NetNewsWire.
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simonwillison.net
2 June 2025
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.
21 May 2025
Founder of OpenStreetMap, the collaborative map of the world; later worked on mapping at Microsoft and Telenav.
I've been avoiding looking at MCP because it just smelled wrong. And yes, it's just XML-RPC but it's JSON. It smells like... SUN SPARCStation and 1999. MCP Related
12 May 2025
Co-founder of Sundial; former vice president of product design at Facebook; author of The Making of a Manager; writes The Looking Glass.
Their words
Conversational UIs are great at quickly getting to the first 70%, but suck at offering easy controls over narrower areas for iteration.
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lg.substack.com
15 April 2025
Economics professor at George Mason University and author of The Myth of the Rational Voter, Selfish Reasons to Have More Kids, The Case Against Education and Open Borders. Writes Bet On It.
16 March 2025
Writer and web developer; founding editor of Lifehacker, co-creator of ThinkUp and of the todo.txt format.
7 February 2025
Distributed-systems safety researcher; runs the Jepsen consistency-testing project and wrote the Riemann monitoring system.
22 December 2024
Astrophysicist at the University of Rochester; works on the search for life elsewhere and wrote The Little Book of Aliens and Light of the Stars.
Their words
Like, okay, there's an advanced civilization that is visiting Earth regularly. They don't want to be detected. They've got super powerful technology, but they really suck at using it because we keep seeing them, we keep seeing them, but then they disappear. I mean, explain to me what rational world that works under.
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youtube.com
2 June 2024
Creator of Claude Code at Anthropic.
3 May 2024
Software engineer; co-founder and former CTO of Tailscale, previously on the Go team at Google.
18 March 2024
Co-founder and CEO of OpenAI; previously president of Y Combinator.
OpenAI
Their words
I expect that the delta between 5 and 4 will be the same as between 4 and 3 and I think it is our job to live a few years in the future and remember that the tools we have now are going to kind of suck looking backwards at them and that’s how we make sure the future is better.
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youtube.com
14 February 2024
Programmer and writer; specified JSON, wrote JavaScript: The Good Parts, JSLint and How JavaScript Works.
7 November 2023
British software developer at Laravel and creator of the Cachet open-source status page system. Podcaster; writes at james.brooks.page.
28 September 2023
Programmer and entrepreneur; co-founded GitHub and created Jekyll, Gravatar and the Semantic Versioning spec.
30 August 2023
Journalist; wrote We Are Eating the Earth on food and climate, and writes the newsletter Emissions.
17 May 2023
Mac and iOS developer at the Iconfactory, where he has worked on apps including Twitterrific and Tot. He writes about development at furbo.org.
10 May 2023
Programmer and writer; specified JSON, wrote JavaScript: The Good Parts, JSLint and How JavaScript Works.
4 January 2023
British senior engineering manager at Netlify, previously a team lead at the BBC; writes about JavaScript testing, chatbots and serverless at marclittlemore.com.
30 June 2022
Co-founder and CTO of Honeycomb; previously an infrastructure engineer at Parse, Facebook and Linden Lab, and co-author of Observability Engineering.
8 December 2021
Developer and podcaster; created Instapaper and Overcast, co-founded Tumblr, and co-hosts the Accidental Tech Podcast.
1 August 2020
Software engineer and writer; former CTO of Wave, now at Anthropic. Blogs at benkuhn.net on attention, engineering management and doing hard things well.
Their words
A special dishonorable mention goes to Slack, which can easily suck away a quarter of your time without you noticing. If you use Slack and you haven’t disabled the “unread messages” badge, stop reading this post and do it now.
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benkuhn.net
31 October 2019
Indian software engineer working on Android and React; writes about his setup and side projects at ishubhamsingh.dev.
15 October 2019
Writer and education-technology critic; published Hack Education for a decade and wrote Teaching Machines.
Their words
I use a MacBook Air that's four or five years old. (My god, I hope it never breaks because the new MacBooks suck.)
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usesthis.com
17 November 2017
Swedish software developer writing about tooling, working from home and running a software business at seastone.io.
12 May 2014
Software developer; created Firebug, helped create Firefox on the Netscape browser team, and built the original Facebook iPhone app.
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A korrent is a belief a person has stated in their own words: one
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