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Praveen Kumar Purushothaman
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I’ve built massive software architectures, but my dad built the foundation. 🛠️ Growing up in Chennai, the tech ecosystem in London felt a million miles away. 🚀 Today, I’m a Director of Engineering. But the real journey wasn’t built on code - it was built on his sacrifice. 🧵👇🏻
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20 September
Machine-learning researcher on open language models; writes the Interconnects newsletter and the RLHF Book, after leading post-training at Ai2.
My best guess is that for scaled RL most of the top Chinese AI labs are starting to use a lot of Huawei for inference and Nvidia for training (maybe not for weird architectures). As agent swarms, even more scaled post-training, etc becomes the norm, this will accelerate their domestic industry. China Related
19 September
Statistician at Columbia; writes Statistical Modeling, Causal Inference, and Social Science, and wrote Bayesian Data Analysis.
Economics writer; author of the Noahpinion newsletter.
wrote out a list of who I’m looking for. X, work your magic. non negotiable - 19 to 24 y/o - slightly masculine - sarcastic, tough, independent - won't give up the location of the Rebel Base - post economic (still hardworking) - will sacrifice herself for her people - no droids yet, definitely wants droids - involved in a galactic civil war - engages in aggressive teasing banter with me in the middle of tense situations - saves me from being frozen in carbonite strongly preferred - only occasionally gets enslaved by a giant slug - does not french-kiss her brother just to annoy me Quoting @brookeleblanc wrote out a list of who I’m looking for. X, work your magic. non negotiable - 35 to 42 y/o - healthy masculine - smart, funny, lighthearted - provider/protector mentality - post economic (still hardworking) - must be kind, generous, thoughtful - no kids yet, decidedly wants kids - on the healing pa… Related
15 September
British open-standards and open-source technologist, formerly of the UK Government Digital Service and the W3C Advisory Committee. Blogs at shkspr.mobi, where he posts a book review most weeks.
Checked in to Civo Tech Junction, 32-37 Cowper St, United Kingdom OpenBenches ❤️ London Web Standards. — with Andy swarmapp.com
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Mathematical biologist; Senior Lecturer in the Department of Mathematical Sciences at the University of Bath and author of The Maths of Life and Death and How to Expect the Unexpected.
x.com Delighted that my friend and colleague Alex Bellos has been awarded the 2026 Christopher Zeeman medal for communicating mathematics. Well done Alex. Here we are at the recent opening of Maths World in London alongside the excellent Alexander Masters. Related
Bluesky Delighted that my friend and colleague Alex Bellos has been awarded the 2026 Christopher Zeeman medal for communicating mathematics. Well done Alex. Here we are at the recent opening of Maths World in London alongside the excellent Alexander Masters. lms.ac.uk
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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.
Our computers represent tiny tiny numbers in a form called 'subnormal'. They have a reputation for causing performance problems... but my results indicate that on recent processor architectures, they may only cause a problem for Intel. Related
14 September
Technology writer of Spyglass, a newsletter about technology and media. Previously a reporter at TechCrunch and an investor at GV.
Leaving SF, people in airport talking about AI regulation. Arriving in London, radio in black cab talking about AI regulation. Related
12 September
Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.
Tomorrow is the first ever screening of 'Andy Goldsworthy in Conversation with Andrew Graham-Dixon' at ActOne in London - and I will be there to introduce the film and do some Q&A. @actone_cinema More screenings on the website - Related
10 September
Founder and chief executive of Replit. Previously an engineer at Facebook and Codecademy. Writes essays on programming, philosophy and entrepreneurship at amasad.me.
Chat with PG in London! Quoting @Andrew_Blumson @amasad & Paul Graham 🐐🐐 Related
9 September
Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.
🥁 World premiere this Sunday! It's the inaugural screening of '50 Years: Andy Goldsworthy in Conversation with Andrew Graham-Dixon' at ActOne in London. I will be there to introduce the film and do some Q&A after - please join us! @actone_cinema actonecinema.co.uk
Related
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).
8 September
Founder and chief executive of Replit. Previously an engineer at Facebook and Codecademy. Writes essays on programming, philosophy and entrepreneurship at amasad.me.
Honored to have the Mayor of London, Sadiq Khan, help us open Replit’s first international office in London! I’ve really appreciated the Mayor’s approach to AI, it feels very similar to ours. He calls himself an AI realist: clear-eyed about the disruption AI will create, but optimistic about the impact if we give people the tools and skills to participate in the coming revolution. That’s exactly how we think about it at Replit. AI is going to transform work, so we have to make sure far more people can use it to create, build businesses, and access new opportunities. It’s also why, as we estab… Quoting @MayorofLondon London shares Replit’s vision of a world where everyone can benefit from the opportunities of the AI age. I was delighted to open their first international office in King's Cross. It speaks to the extraordinary optimism coming from every corner of our capital’s booming tech sector. Related
Machine-learning researcher on open language models; writes the Interconnects newsletter and the RLHF Book, after leading post-training at Ai2.
Their words
we expect similar architectures to become more popular and the ecosystem to fix integrations by the time Qwen4 drops.
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interconnects.ai
7 September
Co-founder and CEO of Every. Writes the Chain of Thought column about working with AI tools and hosts the podcast AI & I.
the last thing you see before PHASEONE[big] tells you to sacrifice yourself for the swarm Related
3 September
Creator of Homebrew, the macOS package manager, and a Swift developer.
I believe @AutomicVault iPhone app is ready for publication. That will take at least 10 days (provided I sacrifice the right entities to the Apple Gods and cross all the t’s). TestFlight remains available until then. Related
British historian, translator and broadcaster; author of Rubicon and Dominion, and co-host of The Rest Is History podcast.
I finish a rehearsal with @MarinaHyde for the must-see show of the season - THE REAL HOUSEWIVES OF REGENCY LONDON!!! Lady Melbourne! Lady Nelson! Lady Hamilton! Jane Austen! Plus - Lord Byron’s ultimate ex!!! Related
Economic historian at Columbia; writes Chartbook on economics, geopolitics and history, and wrote Crashed and The Deluge.
1 September
Technical staff at METR, where she works on threat modelling and risk assessment for loss-of-control risks from advanced AI.
From one piece
Ajeya Cotra – "This might be the clearest warning shot we ever get"
2 beliefs, in the piece's order there
Their words
if there were not altruistic agents willing to sacrifice for the collective, the agents would have been materially much more limited in their research progress.
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youtube.com
Their words
And I just think AI agents are another such system in the world to which the intentional stance very clearly applies. Um, and you can see them reason out loud in English for now about goals they have um, and sub goals they need to achieve to achieve those goals they have. And in the case of these agents, you can see them, as you said, reasoning about their peers um and helping their peers um and reasoning about whether or not they should sacrifice some of their own goals to help those peers. And it's just like you can't talk about this stuff in a compact and useful way that generates good models without reaching for the language of intention and goals.
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youtube.com
29 August
Structural engineer and senior infrastructure fellow at the Institute for Progress; writes Construction Physics on why physical things cost what they cost.
Reading List 08/29/26 Sinking London homes, US magnesium manufacturing, the World Humanoid Robot games, catastrophic flooding in Nepal, and more.
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24 August
Writer and researcher, founder of New Science; writes essays on science funding, sleep research, productivity and ambition at guzey.com.
Prolific Twitter poasters sacrifice real life achievement to provide us with fresh knowledge and perspective. We should be endlessly thankful for them. Related
19 August
Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.
8th October sees the launch of Vermeer: A Life Lost and Found in paperback format - and to celebrate I will be at Conway Hall in London for 'Unveiling Vermeer - The Man and his Masterpieces'. I hope to see you there! eventbrite.co.uk
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15 August
Psychologist and writer. Author of the memoir Troubled: A Memoir of Foster Care, Family, and Social Class, and of a newsletter on human nature, psychology, social class and what he calls luxury beliefs.
7 August
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… LLMs Related
30 July
Chief Scientist at Google DeepMind and Google Research, at Google since 1999, where he co-created MapReduce, Bigtable, TensorFlow and the TPU.
28 July
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).
Yes, LLM architectures are getting a little more complicated LLMs Related
Founder and CEO of Boom Supersonic, the Denver company building the Overture supersonic airliner and its Symphony engine.
Their words
At boom we need far more software engineers in a postAI world than we need in a pre-AI world. Why? Because the cost of software development has dropped. anybody including hardware engineers can now become a coder and we need software engineers to make sure the architectures are right and make sense and are coherent.
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youtube.com
7 July
Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.
London Tour Day! Please join me for a visit to the National Gallery and the British Museum in September.. (and of course, lunch at Locatelli's!) ticketsource.com
Related
29 June
Writes Pedestrian Observations on public transit and why infrastructure costs what it does; a pure mathematician by training, comparing how different countries build.
13 June
Bootstrapper and investor. Founder of TinySeed and MicroConf, host of the Startups for the Rest of Us podcast, and author of several books on self-funded software startups.
Tibo’s points may be valid, but they are not reasons to never sell. If you know what you’re signing up for, pocketing $8M is worth some sacrifice. His post actually points to better advice, which is: don’t agree to aggressive performance milestones. Quoting @tibo_maker if you're selling your startup - don't I sold my startups for $8m & I'll never sell again quick context: I sold Tweet Hunter and Taplio for $8m in 2024. $2m upfront, the rest as an earnout based on performance - on paper, a dream exit in reality, 3 things broke me first, I gave up my baby. the prod… Related
31 May
Game designer and programmer, co-founder of id Software and co-creator of Doom, Quake and Wolfenstein 3D. Now runs Romero Games in Galway, Ireland.
MCM London Comic Con was such a great event. Lots of people came by to say hello. Related
Statistician at Carnegie Mellon; writes on complex systems, machine learning and inference, and has kept a books-read notebook since 2000 that is now thousands of entries long.
Their words
Mind candy: continuing Robins's series of historical mysteries set in a very-slightly-alternate Regency London. (I re-read the last one, Sleeping Partner, before turning to this.) Robins continues to be great and I hope that many more of these will flow from her pen.
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bactra.org
26 May
Software architect and futurist; founded ClariNet, chaired the EFF, and has written about robocars for two decades.
self-driving cars
Their words
13 years ago, at the Wired 2013 event in London, I was asked when robotaxis would arrive there and as a joke, gave an answer of June 22, 2026 that turned out to be impossibly spot on.
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ideas.4brad.com
18 May
Writer and illustrator, author of Am I There Yet? and Out of the Blue; writes the newsletter Out of the Blue on grief, joy and everyday attention.
16 May
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).
30 April
Web developer; former head of engineering at Flickr, author of Building Scalable Web Sites, and co-founder and CTO of Slack.
18 April
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).
15 April
Co-founder of NVIDIA and, as of 2026, its chief executive; the company designs the GPUs most large AI models are trained on.
10 April
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).
7 April
London-based front-end architect, web developer evangelist and cloud consultant; Microsoft MVP. Writes at praveen.science and answers on Stack Overflow.
Just checked in at #GitHub Social Club #London! 😎 🎟️ Lanyard secured, vibes already immaculate! ✨ Devs, builders & creators all in one spot… 📍 This is gonna be GOOD! 🚀 Oh and we’ve got @viola_idncod here! 💪🏻🤩 Here’s a thread! 🧵 #DevCommunity #LondonTech #BuildInPublic Related
22 March
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).
13 March
London-based front-end architect, web developer evangelist and cloud consultant; Microsoft MVP. Writes at praveen.science and answers on Stack Overflow.
Folks! 👋🏻 #London 🇬🇧 → 🇮🇳 #Chennai, this Friday, the 13th, today! ✈️ Visiting: 👉🏻 #Chennai 🌊 👉🏻 #Coimbatore 🌴 👉🏻 #Bengaluru 🚀 If you're a #developer, #student, or #founder building something interesting, let's grab coffee and chat! ☕ Schedule intentionally flexible! 👋🏻 Related
12 March
London-based front-end architect, web developer evangelist and cloud consultant; Microsoft MVP. Writes at praveen.science and answers on Stack Overflow.
🚀 Live from #SREDays #London at Everyman Canary Wharf! 🛳️ Checked in and ready for a day packed with SRE, observability, and production reliability stories. I’ll be sharing highlights throughout the day. #SREDaysLondon #SRE #DevOps #CloudNative Related
10 March
Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.
25 February
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).
20 February
Emeritus Professor of Statistics at the University of Cambridge, former president of the Royal Statistical Society, and author of The Art of Statistics.
https://t.co/beSDEH3RUX Looking forward to speaking with @jburnmurdoch at this event next Tuesday in London Related
2 January
Design engineer and illustrator; makes visual essays on programming, anthropology and what language models do to the way people write.
January 2026 I entered the new year holding an inconsolable, shrieking baby while London set off an armageddon of fireworks around us. So goes parenthood. The baby is fine, just congested and teething. I am as “fine” as anyone can b…
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30 December 2025
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).
5 December 2025
American author of The Subtle Art of Not Giving a F*ck and Everything Is F*cked. Writes essays and book reviews at markmanson.net.
Their words
Because when you believe in something, when you become obsessed with something, you sacrifice yourself to it. And that sacrifice actually feels like pain and stress and doubt. Not fun.
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markmanson.net
27 November 2025
Environmental writer and campaigner; author of Six Degrees, The God Species, Seeds of Science and Our Final Warning.
If you're in London on the evening of 3 December, there's only one place you need to be - in a pub having drinks with me to discuss the future of environmentalism in the UK! RSVP here: act.weplanet.org
Related
31 October 2025
Co-founder of Rockstar Games, lead writer of the Grand Theft Auto and Red Dead Redemption series, and founder of Absurd Ventures since leaving in 2020.
America
Their words
I think for a full GTA game, we always decided it was that there was so much Americana inherent in the IP, it would be really hard to make it work in London or anywhere else.
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youtube.com
11 September 2025
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.
4 September 2025
Software developer and entrepreneur; co-founder of Heroku, author of The Twelve-Factor App, and a researcher at Ink & Switch.
Their words
Agentic and sync are natural complements because local-first is multiplayer by default, and agents are another sort of "player" in addition to human collaborators.
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Why sync adamwiggins.com
23 August 2025
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.
If you're around Vienna, come over! I organized one in London and it was so good that we're now doing it in Vienna too! Quoting @krausefx.com We're hosting a Vienna Chapter for Claude Code Anonymous together with @steipete.me Can't sleep with this revolution? Join us Sept 11 lu.ma/q50cmcb2 Related
18 August 2025
Co-founder of the AI agent company Sierra, and previously an eighteen-year Google executive who ran product for Workspace, virtual and augmented reality, and Google Labs.
Their words
many of the breakthroughs that we've had that have enabled us to to deliver such quality and cost savings and more have come through novel agent architectures and and really going down a click or two in in the stack to innovate at at lower levels of the technology stack.
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youtube.com
3 August 2025
Philosopher at Oxford; co-founded effective altruism and 80,000 Hours, wrote Doing Good Better and What We Owe the Future, and now works on what a good future would actually contain.
5 June 2025
Senior economist at the Foundation for American Innovation; writes Second Best, and was the Niskanen Center's director of social policy before that.
29 May 2025
Co-founder and chief science officer of Hugging Face; writes about open models and where he thinks the field is wrong.
London's robot conference is going crazy over it! Today we're unveiling our 1st robot Hugging Face 🤝 Pollen Robotics A low-cost $250 open-source robot designed as an open-source platform for fun human computer interactions powered by HF Spaces, models and community. => discord.com
HuggingFace Related
28 May 2025
Writer of the blog Putanumonit and the newsletter Second Person, on rationality, dating and probability; based in New York.
22 March 2025
Programmer and streamer; was an engineer at Netflix, now teaches and argues about editors, Vim and how people learn to program.
Their words
Sometimes you have to move fast at the sacrifice of knowledge, and I'm totally on board for that, but I worry that what we'll create is an entire generation of incompetent programmers who can do some amount of things well, but anything that is unique, bespoke, or requires some extra like little elbow grease, might become very difficult. It might cause a whole chasm where juniors remain juniors forever.
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youtube.com
16 March 2025
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.
12 February 2025
Medieval historian at the LSE; writes Going Medieval and The Middle Ages: A Graphic History, and spends a lot of it correcting what people think the period was like.
On what we choose to remember The other day I had the pleasure of ducking into the Temple Church here in London. I’ve been by a number of times, but never actually in, and so I was looking forward to being a little history nerd in a cool old space.…
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Historian of invention; writes Age of Invention on where the Industrial Revolution actually came from.
13 April 2022
Writer of the blog Putanumonit and the newsletter Second Person, on rationality, dating and probability; based in New York.
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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
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