
Building @cimentoai , Host #AGIBuildersMeetup , Prev: SPX @Cloudflare, SCS @carnegiemellon, Views all mine.
San Francisco
Joined February 2022
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Eric retweeted
"the bitter lesson for search is to grep over a filesystem, just like how google works" - rich sutton
Eric retweeted
super important honest advice to founders. if you are working on a dead end, get out. you donโt owe that to anyone, including investors (who regularly forgive and experience failure, and ideally care more about you doing your lifeโs work than a subpar outcome)
Foursquare was acquired last month. The outcome was disappointing. It's taken me a while to write this, but I think I'm finally done grieving it. Here are some thoughts on our final years, an effort to honor the team who helped build & maintain FSQ's legacy, and my attempt to finally get some closure. teendrama.substack.com/p/somโฆ
Eric retweeted
Iโm think weโre all very, very lucky to have super competent operators like Dane and the CF team for times like these. Thanks for your communication and efforts here. Youโre doing the lordโs work ๐๐๐
PHP changes are live. Start patching. php.net/archive/2026.php#202โฆ
Huge thanks to coordinated work by @ThePHPF!
Eric retweeted
supabase would charge ~$33,000/month to sync 100gb live to 1,000 concurrent users. convex ~$27,000
i'm doing it for $9 on one cloudflare durable object ๐งต
Eric retweeted
The definitive guide to SF coffee shops: Which ones did I miss or underrate?
Fully expect to get roasted for this ๐โ๏ธ
Eric retweeted
Always faster, never satisfied.
Cloudflare is now the fastest provider in 74% of the 1,000 largest networks around the world, up from 60% in April 2026. cfl.re/3VjxTBn #BirthdayWeek
Eric retweeted
introducing ๐๐๐๐: our first models trained by @cloudflare's workers ai team.
today, we're releasing two fast and accurate decision models that top the benchmarks for quality and latency. use them hosted on workers ai or grab the weights from @huggingface, because we open-sourced it too.
blog.cloudflare.com/clef-decโฆ
Eric retweeted
State of the art encryption should be free and easily available to everyone. Weโre investing to make that reality.
Twelve years after launching Universal SSL, Cloudflare is applying to become a certificate authority. By combining an established root, an ACME-first approach, and Merkle Tree Certificates, we are building a post-quantum CA for the open web. cfl.re/4AFIczO #BirthdayWeek
Eric retweeted
Welcome to @Cloudflare's #BirthdayWeek. As is our tradition, @zatlyn and I penned our annual Founders' Letter to kick the week off: blog.cloudflare.com/cloudflaโฆ
Eric retweeted
I made a techno remix out of a song I recorded with an acoustic guitar in 2011, and asked Opus 5.5 for a music video with a JavaScript-forward art style.
(Itโs DDR optimized. Anyone else here plays DDR and is interested in steps?) ๐งต
Eric retweeted
Agent maxxing.
i have 30 AI subscriptions:
- 17 @ChatGPT Pro 20X
- 7 @DevinAI Max
- 5 @claudeai Max
- 1 @cursor_ai Ultra (via @bot)
i'm rocking 39 terminals today in @zeddotdev
- 28 Devin with SWE-2 (free+unlimited on the Max plan)
- 11 Claude Code with Opus 5.5
- (many subagents inside each)
hope you're having a great weekend too
Eric retweeted
After 15+ years at Cloudflare, I am taking some time off to recharge and look for my next adventure.
Please apply if you'd be a great fit to lead an amazing team of Trust & Safety professionals who are helping to make the Internet better every day. linkedin.com/jobs/view/44685โฆ
Eric retweeted
13 years ago I thought "I should write a blog post about the economics of open source" but the outcome was too depressing. After noodling on it for a decade, I have finally finished the post. I wasn't expecting to end up at "Microsoft should send corporations a huge bill" but hey, a lot has changed.
seldo.com/posts/nobody-pays-โฆ
Eric retweeted
As COO of a fast-growing company, I spend a lot of time noticing what stopped scaling. Last month it was Slack.
Put a few hundred people in a channel and Slack stops being a conversation and starts being noise.
So here is how Warp communicates, in 4 pillars:
1/ Threads, always. Reply in the thread, not the channel. One topic per thread, and if the conversation shifts you start a new message. A channel should be readable by someone who joined it five minutes ago.
2/ Communicate concisely. Ayush wrote our Bottom Line Up Front doc in December and it comes down to one thing. The ask or the conclusion goes in the first line, context after. Batch your thoughts into one message instead of five short ones back to back. Easier to read, easier to search, less noise for the people it wasn't for.
3/ Channels over DMs. If the answer could help someone else now or later, it goes in a channel. DMs are for private or sensitive things only. A customer issue debugged in a DM helps exactly two people. Three months later someone solves it again from scratch.
4/ Close the loop. If you're tagged and don't react, the sender has to assume you didn't see it.
๐ is seen and on it. โ
is resolved. ๐ is an FYI that needs nothing.
Banter is exempt. None of that needs threading or batching.
Public channels let people self-serve instead of asking the same question twice. That runs both ways: before you ask, search. The answer is often already sitting in a channel, and we protect deep work here, so an avoidable ping that pulls someone out of focus is a cost the whole team pays.
And at an AI-native company, your channels are also what your agents read. A decision buried in a DM is invisible to every person and every agent who needs it later. As far as the company is concerned, it never happened.
We're 70 people today and will be a few hundred soon.
If you want to join us as we scale, we have 20 open roles right now. Link in the comments to apply.
Eric retweeted
Iโm excited to finally announce the newest edition my Stanford course ๐ง๐ต๐ฒ ๐ ๐ผ๐ฑ๐ฒ๐ฟ๐ป ๐ฆ๐ผ๐ณ๐๐๐ฎ๐ฟ๐ฒ ๐๐ฒ๐๐ฒ๐น๐ผ๐ฝ๐ฒ๐ฟ. It has been 9 months in the making.
Last November, with the release of Claude Opus 4.5, coding agents experienced a step function improvement in capability. We all felt it. The LLMs were more powerful, could reason for longer, solve harder tasks.
This yearโs iteration of my course reflects the 2026 metamorphosis of software engineering.
My core belief is simple: AI-native developers of the LLM era are going to become the most important members of any software organization. I have designed my course to train this next generation of engineers.
๐ช๐ต๐ฎ๐โ๐ ๐ฑ๐ถ๐ณ๐ณ๐ฒ๐ฟ๐ฒ๐ป๐ ๐๐ต๐ถ๐ ๐๐ถ๐บ๐ฒ ๐ฎ๐ฟ๐ผ๐๐ป๐ฑ
First, 85% of my Fall 2025 class material is being thrown out.ย The Fall 2026 syllabus reflects the core capabilities AI-native engineers must have: agent skills, advanced context engineering, MCP portals, agent-ready codebase principles, agentic code review, security, parallelizing background agents, software factories, and more.
Second, I am going to teach my students how to have software taste. Every student will be required to ship pull requests to production-grade, real-world codebases. The course is collaborating with the top open-source AI repos who will offer support and mentorship to students on how to meaningfully contribute to their projects.
This has never been done before in any university course so I am incredibly grateful to our OSS Partners:ย @browserbase, @HeyGen, @CopilotKit, @semgrep, @OpenHandsDev, @milvusio, @marimo_io, Pi, @crewAIInc, @warpdotdev, @vercel, @cmux, @arizeai, @UnslothAI, and @anyscalecompute.
๐ช๐ต๐ฎ๐โ๐ ๐๐๐ฎ๐๐ถ๐ป๐ด ๐๐ต๐ฒ ๐๐ฎ๐บ๐ฒ
Iโm fortunate to again have AI software engineering leaders and founders as guest speakers to share their learnings from building top coding agent products. Thank you to @leerob from @cursor_ai, @bcherny of @claudeai code, @EnoReyes of @FactoryAI, @silasalberti of @cognition, @0xine of @semgrep, Rajesh Bhatia of @Cloudflare , @amasad of @Replit, and @eladgil.
All resources will be available online. All classes will be available to the public.
9/22 on Stanford campus. See you in class.ย
themodernsoftware.dev/
Eric retweeted
Almost half of US unicorns were founded by first-generation immigrants.
The chart is from my earlier research on the topic (I should update it โ and will), but the point stands: immigrants have an outsized impact on US innovation.
At the time, 65 countries had produced at least one US unicorn founder. I'm sure the count is higher now.
Eric retweeted
First CMU Agents class done today w/ @dan_fried, looking forward to getting the video processed and uploaded soon!






























