Teddy Citrin
@tcitrin
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Founder of Definition @appliedcompute, @cognition, @decagonai, @modal, @privy_io, @rox_ai, @tldraw, @tryramp, @togethercompute, @valthostech
nyc 🌃
Joined June 2009
Proud to launch Definition ⚡️ https://t.co/xRrhQ8kryx
medium.com
We are excited to announce the launch of Definition with an $80M Fund I.
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Decagon has raised an additional $250 million, tripling our valuation to $4.5 billion in less than six months. We’re on a mission to help every company create concierge customer experiences. We believe every customer deserves support that is personal, proactive, and always
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🔥🔥🔥
Excited to share that @DecagonAI has raised a Series D, tripling our valuation to $4.5B in less than six months! Our funding is a testament to how a fundamentally different approach to product can win vs the incumbent strategies. From the beginning, our focus has been to
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Meet Brian. Brian’s been carrying accounting on his back for a long time. Super Bowl Sunday, he finally gets backup.
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@thejessezhang and @ashwinsreenivas are rebuilding how businesses talk to customers with @decagonAI.
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Most AI review tools today center around asking an arms-length agent to catch & report potential bugs. This is really valuable! But until we reach the point where you can confidently hit "Merge" on a 5000-line agent PR, you're still bottlenecked on reviewing the code yourself.
Meet Devin Review: a reimagined interface for understanding complex PRs. Code review tools today don’t actually make it easier to read code. Devin Review builds your comprehension and helps you stop slop. Try without an account: https://t.co/Zzu1a3gfKF More below 👇
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joseph is goated. time for a new era of devin & windsurf design :)
I’ve joined @Cognition to lead Design and build out their Design team. The Windsurf and Devin you know of today is about to get exponentially better. Look forward to 2026 because we’re reshaping everything.
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Today, we’re launching Ramp Sheets, the AI spreadsheet editor built to 10x finance teams, operators, and founders. Ramp Sheets plans, executes, and formats automatically. It’s already being used to model budgets, forecast revenue, and reconcile financial statements.
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Today, Ramp raised another $300M at a $32B valuation. In the past year our revenue has doubled to over $1B, growing 10x faster than the median public SaaS. We all know money talks — we're teaching it to think. Getting big no longer means getting slow.
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Generalists are useful, but it’s not enough to be smart. Advances come from specialists, whether human or machine. To have an edge, agents need specific expertise, within specific companies, built on models trained on specific data. We call this Specific Intelligence. It's
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One of the greatest opportunities in AI safety and security is the chance to help support the creation of new industry verticals that help maximize the benefits and minimize the risks. The technology is moving fast. One of the best ways to keep up is with more technology, more
Valthos builds next-generation biodefense. Of all AI applications, biotechnology has the highest upside and most catastrophic downside. Heroes at the frontlines of biodefense are working every day to protect the world against the worst case. But the pace of biotech is against
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Proud to partner with @kath_mcmahon and the @ValthosTech team on this deeply important mission
Valthos builds next-generation biodefense. Of all AI applications, biotechnology has the highest upside and most catastrophic downside. Heroes at the frontlines of biodefense are working every day to protect the world against the worst case. But the pace of biotech is against
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Devin, the first AI software engineer, created by @cognition, acts as an "army of junior engineers." Cognition’s president @russelljkaplan discusses the goal to “promote” Devin to senior engineer, which could transform AI innovation. https://t.co/ufUPTD77oY
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We rebuilt Devin for Claude Sonnet 4.5. Available starting today as an Agent Preview that’s over 2x faster and 12% better on our Jr. Developer Evals.
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We've raised our Series B! We’re excited to grow our team and continue building AI-native infrastructure to power the next generation of applications. Thank you to our investors, the Modal team, and our community 💚 https://t.co/ATzEhhdE9f
axios.com
Lux Capital led the round.
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6 months, 25 million revenue agents & 3 trillion tokens later... Rox is now globally available 🌎 Just as coding agents 10x’d engineering, revenue agents 10x customer work. With Rox, humans are evolving to orchestrators while agents manage the end-to-end customer lifecycle.
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Modal's goal has always been to build an entire suite of tools for building ML/AI applications, starting with the compute layer. We're launching Notebooks today. It leverages our powerful Modal infrastructure to startup up GPU-backed kernels in seconds, and much more. Try it
We're thrilled to share Modal Notebooks: a new, powerful cloud-hosted GPU notebook. It has modern real-time collaborative editing and is backed by our AI infrastructure — swap GPUs in seconds. Modal Notebooks are generally available, and you can start using them now. 🧵
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Big milestone for @tryramp: the cover of Fortune. Grateful for our customers, team, and everyone helping us build what’s next.
Five years ago, @tryramp launched its first product. Last month, we crossed $1B in annualized revenue—while generating free cash flow. Banks sell money. Ramp sells something different: time. Grateful to @leomschwartz and @packym for two of the most extraordinary deep dives yet
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