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19 September
Programmer, musician and author of The Passionate Programmer; organised RubyConf and RailsConf and has worked as a CTO.
Here’s a weird idea coming out of @freeq.at What if chat rooms were actors, in the Erlang/Elixir sense? Their own state, resources, and behavior. Rooms that could call other rooms. Related
18 September
American science fiction novelist (Old Man's War, Redshirts, The Kaiju Preservation Society); has run the blog Whatever since 1998.
17 September
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 a great city and I do regret not having 6 months in a loft as a dumb 20 something getting into trouble Related
16 September
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.
imma regret saying this. but. pi 3.14. next week friday. just a new harness. Related
15 September
Writer and former McKinsey/BCG strategy consultant; author of The Pathless Path and Good Work, about leaving the default career track. Publishes the Boundless newsletter and podcast.
I think the most interesting thing about the business world is that it presents infinite things that “make sense” based on profit and then as a person you need to figure out where your lines are, ethically and morally and then also the ultimate test - what you won’t regret Related
1 September
Principal engineer at Cloudflare as of 2026, on agents and developer tooling. Streams TypeScript, OCaml and Neovim on Twitch, and wrote the better-result library after writing the same Result type about a hundred times.
TypeScript
Their words, before
introducing better-result, my opinionated take on the rust result type for typescript after having written about 100 times
npm i better-result
*disclaimer*: if you can use effect-ts, you should use effect-ts
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Their words now
every time i’ve built something without effect over the past almost 3 years ive come to deeply regret it and wish i had just done it from the start
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Principal engineer at Cloudflare as of 2026, on agents and developer tooling. Streams TypeScript, OCaml and Neovim on Twitch, and wrote the better-result library after writing the same Result type about a hundred times.
TypeScript
Their words
every time i’ve built something without effect over the past almost 3 years ive come to deeply regret it and wish i had just done it from the start
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@dillon_mulroy on X x.com
26 August
Programmer; makes Handmade Hero and teaches Performance-Aware Programming, and argues loudly about how software got slow.
Their words
I've said like the licensable engine thing kind of was our AI transition already unfortunately and uh I regret to inform you that the news is not probably that positive.
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youtube.com
17 August
Founder and former CEO of Zynga, the social-games company behind FarmVille, Zynga Poker and Words with Friends; says he founded ten companies in all, and wrote Life at the Speed of Play.
Similar story. My company https://t.co/E0nVasQNNz was one of the handful of cos that could go public in the end of the dotcom IPO window bc we had $170m in bookings. Accel went on a jihad to replace me as CEO bc i was 32 and had never run a public co. They literally couldnt find a single reason other than my lack of age and experience and i had the junior partner who needed to prove he had the mojo to change out one of ‘his’ ceo’s. I regret that i eventually caved since it led to such a lower $$ outcome with the grey haired HP ceo who had no ability to navigate the multiple reinventions neede… Quoting @dnapway Travis Kalanick reveals Bill Gurley pressured him to take a $6 billion valuation. Two months later, he raised at $17.5 billion. "Gurley was convinced it was the end of the world and we've got to raise, and just take your first term sheet, just f*cking take it." "We got to a place where I just would… Related
16 August
Programmer and teacher; writes on software, learning and the web, and makes the Coding Blocks video course.
Their words
The only regret I have is not reading this book 5 years earlier. Also, not every single teacher on the planet did read this — what a shame.
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rakhim.org
4 August
Writer and former Substack product manager; publishes essays and interviews on technology, culture and China at jasmi.news.
This piece is out! 4 sites, 10 days, and 6000 words on the politics of data centers in the Midwest: https://t.co/uOL7vmf3wC I talked to union leaders and real estate brokers, activists and local officials, politicians from Kathy Hochul to Abdul El-Sayed. A few takeaways: - Activists are as pissed at their local officials as at AI companies - The bigger the dollar signs, the more skeptical people are - Past corporate failures (Foxconn, GM, DTE) prime community distrust - Even data center proponents regret the NDAs - Media narratives turn local grievances into national movements - Residents fea… Quoting @jasminewsun I’m spending the next week driving around Wisconsin and Michigan to get a firsthand view of the data center buildout and backlash am visiting sites, talking to tons of people — tradespeople, activists, planners, residents — then writing up a story lmk what questions I should dig into! data centers Related
17 July
Indian software developer working with React and TypeScript; writes and publishes a newsletter at sreetamdas.com.
4 July
Indian value investor who taught Behavioural Finance and Business Valuation as an adjunct professor at MDI Gurgaon. He writes the Fundoo Professor blog about investing, moats and mental models.
Message from my daughter Meet Lulu: born on the streets of Delhi but meant for only fine treats, Lulu is an orphaned female puppy who lost her mother and her littermates. A rough start to life hasn’t dampened her spirit though: Lulu is a feisty, energetic, adorable ball of fun! Give her a chance - you won’t regret it 💛 Contact Garima if interested in adoption. Related
14 March
Mac and iOS developer at the Iconfactory, where he has worked on apps including Twitterrific and Tot. He writes about development at furbo.org.
Their words
As you’ll see below, this is not a printer that will be easy to deal with on a Mac. It will be a purchase you regret.
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furbo.org
12 February
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.
Their words
I actually think vibe coding is a slur.
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youtube.com
1 October 2025
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.
Their words
The panel had a generally positive view of Phoenix, with one panelist calling it one of his “favorite open source eval tools.” The tool is positioned as a developer-first, notebook-centric platform.
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hamel.dev
30 June 2025
Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.
Their words
He offers a unique form of grounding on political, sports and other issues, and a way of bridging my kinds of ideas into mainstream discourse. I almost never regret reading.
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thezvi.substack.com
31 December 2024
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.
Their words
The Tombs of Atuan - My only regret is that I came to Ursula K. LeGuin so late in life, and this might be my favorite of all of her books I've read so far.
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vickiboykis.com
16 December 2024
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.
14 June 2024
Indian software developer working with React and TypeScript; writes and publishes a newsletter at sreetamdas.com.
29 December 2023
Indian software developer working with React and TypeScript; writes and publishes a newsletter at sreetamdas.com.
Another year of Advent of Code in Elixir — this time even better than last year! Related
9 May 2023
Financial journalist; chief financial correspondent at Axios and host of the Slate Money podcast, previously a blogger at Reuters and author of The Phoenix Economy.
20 April 2023
Founded CD Baby in 1998 and sold it in 2008, giving the proceeds to a charitable trust for music education. Since then a writer and speaker: five books and 550+ articles, published first at sive.rs, which they hand-code and keep free of advertising.
On changing their mind
There's always a chance I might never see my family again. Because of that, I often regret it. It's usually best to keep options open.
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22 October 2019
Journalist and author of Can't Even: How Millennials Became the Burnout Generation. Writes the newsletter Culture Study, which runs a recurring links-and-recommendations issue.
Their words
Instagram-influenced purchase I regret most: Brooklinen sheets
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annehelen.substack.com
Their words
Instagram-influenced purchase I regret not at all: The Summersalt Sidestroke
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annehelen.substack.com
15 January 2019
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?
Their words
I'm currently on a late 2016 MacBook Pro, 13", with a Touch Bar. I deeply regret the MBP - 1: dongle life, 2: the lack of a physical escape key makes coding in emacs very difficult, 3: the keys on the butterfly keyboard are constantly too loose or totally stuck, 4: so much beach ball.
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usesthis.com
16 July 2018
Software engineer; co-founder and former CTO of Tailscale, previously on the Go team at Google.
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