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Lilian Weng
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Thinking about High-Quality Human Data
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16 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.
agent-browser, now more human --cursor Visible pointers and click feedback --human Smooth, curved mouse movement / drags For demos, bug repros, reviewing agent runs Related
8 September
Web standards author and speaker; wrote the CSS: The Definitive Guide series and co-founded the An Event Apart conference.
I find myself in a situation of creating favicons for a few things (it’s an internal task) and so I need to make ones that work in dark mode as well as light. I know how to make adaptive favicons, but does anyone have pointers to good *visual* best practices for dark mode favicons? My DuckDuck-fu is only turning up how to make them adaptive, not what they should actually look like to read well against a dark tab background. Related
14 August
Ruby and Rails core committer known online as "tenderlove"; maintains Nokogiri and works on Ruby performance.
Been reading a lot of GC books lately. They've got heaps of pointers! Related
11 July
Engineering leader and writer; wrote An Elegant Puzzle, Staff Engineer and The Engineering Executive's Primer, and blogs at Irrational Exuberance.
Make no assumptions. I’ve recently been thinking a lot about the concept of “soil horizons”, which is the idea that there are many distinct layers of soil, from topsoil all the way down to bedrock, which all combine into a…
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4 July
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.
15 May
Statistician and software engineer who writes R packages for reproducible research and publishing, including knitr, bookdown and blogdown.
Converting testthat Tests to testit Back in 2013, I wrote about testing R packages when I first released testit. Thirteen years later, I still believe that unit testing should be nothing more than “tell me if something unexpected happened.” Re…
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5 April
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.
NASA Elements of Engineering Excellence I stumbled across this report from NASA, “Elements of Engineering Excellence”, published in 2012, The inspiration for this paper originated in discussions with the director of MSFC Engineering in 2006 who as…
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23 February
Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.
Some Silly Z3 Scripts I Wrote As part of writing Logic for Programmers I produced a lot of “chaff”, code samples and sections I wrote up and then threw away. Sometimes I found a better example for the same topic, sometimes I threw the to…
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5 November 2025
Rust engineer at Google working on Android; maintains Tokio and works on Rust in the Linux kernel.
26 June 2025
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.
10 June 2025
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.
30 April 2025
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.
7 March 2025
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.
13 February 2025
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.
9 November 2024
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.
11 July 2024
Rust engineer at Google working on Android; maintains Tokio and works on Rust in the Linux kernel.
18 March 2024
Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.
17 March 2024
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: The Return of the Frame Pointers (Fedora, Ubuntu) Related
18 December 2023
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.
15 April 2023
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.
Efficiency trades off against resiliency What’s the “right” level of CPU utilization for a server? If you look at a monitoring dashboard from a well-designed and well-run service, what CPU utilization should we hope to see, averaged over a da…
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27 January 2023
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.
24 September 2021
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.
Nothing matches. Show everything
A korrent is a belief a person has stated in their own words: one
sentence stating the claim, backed by a quote and a source, kept at
korrents.com .
Under a name here, the quoted block is what they actually said.
The korrent beneath it is the claim those words support, in
korrents' wording — tap it to see the record, its source, and who
else holds it.
Nobody here wrote their own korrents. They are compiled from public
statements, and a person can change their mind, which is recorded too.
Got it
About the English under a post
Some people here publish in a language other than English. Where they
do, this site shows a machine translation beneath the post, in
this typeface — the site's own, not theirs.
The post itself is never changed, moved or hidden: what is set in the
serif above is exactly what the person published, and it is what to
quote them on. A translation can be wrong in ways that matter,
especially about tone.
Only the post's own words are translated. A quoted post, a linked
article and a belief on korrents.com
are left in their original language.
Got it