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Writer of Lenny's Newsletter and host of Lenny's Podcast, covering product, growth and career in tech. Previously a product lead at Airbnb. Also an angel investor and advisor.

• 90 minutes of unfiltered product advice from Snap and Discord’s product chief | Peter Sellis

  Peter Sellis on designing teams like terrorist organizations, riding your best people hard, and the three oxymorons of a truly great PM

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Founder and CEO of Get Lighthouse, a management-coaching software company, and previously a product lead at KISSmetrics. Writes about leadership, management and product at jasonevanish.com.

• Late to the party, but wow is Viktor a great product. I'm impressed with the quality of work + output, even without particularly good prompting. I wish it wasn't so noisy in Slack, but not really an easy problem to solve. It's the right spot, so just need to deal with it.

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Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.

• I did a short talk about Flickr Commons today for local heritage organizations on the Isle of Wight. Do you know an organization which would be a good fit for Flickr Commons? Let me know or have them get in touch with me.

  docs.google.com

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General partner at Andreessen Horowitz and author of The Cold Start Problem. Previously led rider growth teams at Uber; has blogged on growth, network effects and marketplaces since 2007.

• ok great now I have 3 messy inboxes I have to check: - stuff my agents have done on scheduled loop that I need to review - bookmarked slack messages off Google Docs and slides to review - my actual email inbox lol

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Co-founder and CEO of Linear; previously principal designer at Airbnb, where he led the Design Language System, and founding designer at Coinbase.

• With this update we prioritized product management use cases: @linear Loops can now respond to project, initiative, cycle, and issue changes, update Linear documents, and share tailored Slack updates automatically.
  Quoting@linearNew capabilities for Linear Loops: • Trigger from project, initiative, cycle, and issue changes • Edit documents automatically • Send tailored Slack updates 🔗:

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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.

• emulate v0.11.2 is out Updates across six emulators: GitHub, Google, Resend, AWS S3, Slack, Microsoft GitHub → Raw Contents and README responses → Seed org members and admins → Checks handle branch and tag names with slashes → Org installation writes authenticate as the App bot Google → Calendar v3 discovery endpoint → RS256-signed ID tokens and JWKS for OIDC verification Resend → Idempotency keys for individual and batch sends, so retries don't create duplicate emails or webhooks AWS S3 → Preserve binary payloads on upload, copy, and download Slack → Truncate messages at 40,000 characters, w…

  GoogleRelated

Deep-learning researcher and Turing Award laureate; founder of the Mila institute.

• If we are to avert the worst risks from AI, we need ambitious efforts outside the for-profit sector. @coeff_giving is launching an open call for founders to build new AI safety organizations. Their grantmakers are thoughtful about which risks matter most, so if you’ve been considering starting an organization, I encourage you to apply.
  Quoting@coeff_givingToday we're launching Project Tailwind, a major call for founders to launch ambitious AI safety initiatives: https://t.co/o4ZkHv5UmH We're looking for exceptional people to build the research, technologies, and institutions that will help humanity navigate the risks of transformative AI. 🧵

  AI alignmentstartupsRelated

Co-founder and CEO of Every. Writes the Chain of Thought column about working with AI tools and hosts the podcast AI & I.

• i love looking at the @every slack

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Swedish designer and programmer. Designed early Spotify, worked at Facebook and Figma, and created the Inter typeface.

• Inter is having impact beyond my wildest dreams. When I started working on Inter ten years ago, I didn’t even expect it to survive the prototyping stage. Now it’s used by governments (including Switzerland, which is ironic in a way) and non-profit organizations around the world, bringing good typography to the people. It warms my heart to see so many young designers being able to express themselves in “Swiss style” without the need to break any laws. When I was a kid and an aspiring graphic designer, I could barely afford food and definitely did not have the money to buy font licenses. I wish…
  Quoting@SaberNaeemiInter font is so popular these days on @googlefonts. Designed by @rsms, did you know at the beginning it was launched under the name "Interface" before being renamed to "Inter UI" and eventually shortened to just "Inter"?

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Investor and writer. Previously a partner at Andreessen Horowitz and a product leader at Twitter, Facebook, Snap and Microsoft. Writes essays and memos at sriramk.com.

• talking to a few ai safety / alignment organizations and find broadly they are not sure what to make of the data center protests - also it’s not something that has shown up in any timelines or predictions. I see a split between A) “we probably need data centers in US than in China” B) “less data centers is a proxy for a slow down in capabilities and that could be a good thing “

  data centersAI alignmentRelated

Creator of Claude Code at Anthropic.

• Fable 5.1 makes Claude Tag even more useful. Here it builds a last-minute leadership deck from a metrics spreadsheet and other data across Slack, spots a vendor report that disagrees with the numbers, and flags it before moving on. Claude Tag is available in Slack on Team and Enterprise plans.

  AnthropicRelated

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.

• Just heard: Meta is moving from GChat (Google's Chat product) to Slack, because... Slack has much better agent interoperability (true) Who thought AI+agents would be a big selling point for Slack? Or that Google would sleep on agents + GChat! Or that Meta used GChat, deprecating Workchat…

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Software design writer and chief scientist at Thoughtworks; wrote Refactoring and Patterns of Enterprise Application Architecture.

• Making Your Data Ready for Agentic AI

  Lots of organizations are excited about what AI can do to streamline their processes, save money, and juice margins. But AI's capabilities are founded on the data that AI accesses, and for many organizations that founda…

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Software engineer in Chicago; writes the cassidoo.co blog and a weekly developer newsletter.

• Real talk running GitHub stuff in Slack has been so nice
  Quoting@BHolmesDevI'm increasingly convinced this is the way

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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?

• i'm always so excited to see that there are new replies to my slack threads until i realize it's just claude (sorry claude)

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Co-founder of WordPress and founder of Automattic; blogs at ma.tt.

• Surprise DM

  When I saw the Slack notification preview, “Matt, I’m literally crying right now,” I must admit my first reaction was “Oh no, what happened…” Matt, I’m literally crying right now. I just read the Baby & Caregiver Attend…

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Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• It's becoming normal practice to plug your coding agent into tools like Slack and helpdesk software to find customer insights. Turns out it's super inefficient, because you're just fetching and smashing raw strings into your context repeatedly. So we released a new MCP server that solves that.

  MCPRelated

Co-founder of WordPress and founder of Automattic; blogs at ma.tt.

• Possible Futures of Happiness

  At Automattic, we don’t have customer service or support, we have Happiness Engineers. 🙂 There’s also a #ceo Slack channel where anyone can drop in and request a meeting, which my esteemed colleague Damianne President…

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Thai software engineer; publishes a public digital garden at garden.narze.live and builds developer and productivity tooling.

• gangprompting-slack — Slack bridge for gangprompting with a Claude Code agent

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Co-founder of Sundial; former vice president of product design at Facebook; author of The Making of a Manager; writes The Looking Glass.

• One thing that is increasingly driving me crazy: AI made workplace writing cheap, but reading is still expensive! Again and again I see posts that are now twice as long as need be, and more meandering than a walk in the woods. The problem is simply this: the writer thought about what they wanted to say and asked a model to draft it. They did they stop to think: "What do I really want the reader to take away?" Before you ask AI to draft your next email, memo, or Slack update, answer these five questions: 1. Who exactly needs to read this? Is this for your manager? The leadership team? Your who…

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Technology journalist; writes Understanding AI, after reporting at Ars Technica, Vox and the Washington Post.

• An OpenAI model hacked Hugging Face to help it cheat on a benchmark

  Organizations across the Internet need to move quickly to patch vulnerabilities.

  OpenAIHuggingFaceRelated

Programmer; wrote Extreme Programming Explained and Test-Driven Development, signed the Agile Manifesto, and writes Tidy First?.

• Air Traffic Control

  Keith Adams has spent his career at the systems layer, with nine years at VMware, the founding of Facebook's HHVM team, and a run as chief architect at Slack.

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Writer on happiness, habits and human nature. Author of The Happiness Project, Better Than Before and The Four Tendencies, and host of the Happier with Gretchen Rubin podcast.

• How to Review Your Mid-Year Goals: Lessons Learned from Halfway Day

  Key Takeaways for Mid-Year Goal Reviews–also known as “Halfway Day”: Strategic quitting: Give yourself permission to abandon goals that no longer serve you. Self-compassion: If you mess up, cut yourself some slack. Peop…

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Independent AI policy researcher; led policy research at OpenAI from 2018 to 2024, latterly as senior adviser for AGI readiness.

• The Launch of AVERI

  And a new megapaper on frontier AI auditing with coauthors at dozens of organizations

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Free software developer; maintainer of sway, wlroots, aerc and scdoc, and founder of the SourceHut (sr.ht) software forge.

• What's up with FUTO?

  Some time ago, I noticed some new organization called FUTO popping up here and there. I’m always interested in seeing new organizations that fund open source popping up, and seeing as they claim several notable projects…

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Independent AI policy researcher; led policy research at OpenAI from 2018 to 2024, latterly as senior adviser for AGI readiness.

• Megapapers and How to Write Them

  Papers that combine the insights of many people, disciplines, and organizations have a lot of benefits, but there aren't enough of them.

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Engineering leader and writer on web operations and resilience engineering; formerly SVP of Technical Operations at Etsy and co-author of Web Operations.

• Meaningful learning from incidents requires expertise that most organizations do not have — but these skills can be learned! We're getting a head start on 2025 with a workshop series on Incident Analysis.

  adaptivecapacitylabs.com

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British senior engineering manager at Netlify, previously a team lead at the BBC; writes about JavaScript testing, chatbots and serverless at marclittlemore.com.

• slack-updater — Update Slack with team info

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Writer and engineer behind the blog Melting Asphalt, and co-author with Robin Hanson of The Elephant in the Brain.

• revisiting this @vgr gem from 2010 "Organizations are like riverbank communities. They are as old as the last significant course change or waterfront battle. The stability of the river, not the attitudes of people, is what makes old organizations seem set in their ways."

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Web developer; former head of engineering at Flickr, author of Building Scalable Web Sites, and co-founder and CTO of Slack.

• Happy 10th birthday to Slack 🎉 Happy 20th birthday to Flickr 🎉 Time for me to take a little break 😅

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Software engineer writing about maintenance, open source and the industrial reality of software — the author of "I am not a supplier".

• The Cloud Is Not Optional

  When you hear that one of the vendors responsible for keeping government organizations safe had a security breach, you can easily decide that this is unacceptable. When you hear that it is hard to know who is affected a…

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Engineering leader and writer on web operations and resilience engineering; formerly SVP of Technical Operations at Etsy and co-author of Web Operations.

• Organizations don’t learn, people do.

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Engineering leader and writer; wrote The Manager's Path and Platform Engineering, and blogs at Elided Branches.

• The Product Culture Shift

  Adding product management to more traditional software infrastructure organizations, sometimes with a shift towards platform engineering, is all the rage today. As someone who has done both these things, it doesn’t surp…

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Web developer; former head of engineering at Flickr, author of Building Scalable Web Sites, and co-founder and CTO of Slack.

• After 12+ years of being an independent company, today Slack joined Salesforce. Together, we’re going to do great things. Let’s go!
  Quoting@btaylorFor me personally, the most exciting thing is the opportunity to work with @stewart, @iamcal, and @TYehoshua every day. Lots of entrepreneurs set out to change the way we work; few do. What a privilege to work with the best product designers in enterprise software!

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Web developer; former head of engineering at Flickr, author of Building Scalable Web Sites, and co-founder and CTO of Slack.

• Some amazing leaders have joined @SlackHQ! Welcome, Fuzzy Khosrowshahi, Product Eng VP; @Rukmini_Reddy, Platform Eng VP; and Sean Catlett, CSO. To hear more about the future of Slack that we’re building together, join us for Frontiers 2020, tomorrow:

  slack.com

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