software @cursor_ai. prev @figma / taught CS @penn. native new yorker, check out subwaystories.nyc
New York
Joined June 2009
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Hey NYC 👋🚆 so excited to share my team's submission to the @MTA open data challenge: subwaystories.nyc! A map of over 1B subway rides
there are some pretty interesting tradeoffs where sometimes semantic search outperforms and sometimes grep does... cursor has both!
Jediah Katz retweeted
Made a joke app for when people ask questions that @cursor_ai can answer: lmctfy-one.vercel.app/
not sure exactly what happened here, but I was an engineer at figma and I had zero ability to access any customer files unless they shared them with me
Called Zack to apologize (and appreciate his willingness to talk despite the late hour).
This note from our Sales team is totally unacceptable and the opposite of how we want to work with customers.
Let me be clear in response to questions that have come up.
No one in Sales has access to the contents of customers' Figma files. Customer support and select members of our R&D team can access files in certain situations that the customer has authorized. All access is logged and we have monitoring in place.
We are formally investigating the rep behavior and will act appropriately. Our initial findings are that file names were accessed in an interface that was built for sales to address customer issues — against our training and protocols, which we are also reviewing.
As part of our efforts to improve the agent harness in Cursor 2.0, we've significantly improved the quality of GPT-5-Codex responses.
It can now work uninterrupted for much longer, with reduced overthinking and more accurate edits. Enjoy!
When I was studying in college, the process was beautifully brutal. You’d be handed a problem or a theorem to prove, and the real work began, not just solving it, but wrestling with it. try different approaches, hit dead ends, rethink, and eventually sometimes after hours or days you’d crack it. That moment of insight wasn’t just satisfying it was transformative. The struggle itself was the learning. It taught persistence, creativity, and the ability to navigate skills that stay with you for life.
I'm ashamed to admit that even as an early Cursor fan and employee, I've had my doubts about coding agents as a whole.
The value is undeniable, but sometimes I get a bit depressed when I start to feel like a tool of the agent and it stops bringing me along for the ride. I can send a task to GPT-5-high and it will almost certainly come back with the right answer, but now what? Do I just start scrolling and forget what I was doing? Try to become a manager of a fleet of agents? The flow state that I always had is waning and sometimes I fear that my love of programming since childhood will go with it.
But Composer has shown me an alternative future! Last night I compared this model to a glove, just a thin layer between myself and what I'm building. It's fast enough that it feels like speaking code into existence. I can focus on one thing at a time again. I'm very grateful for that.
Will I be using it exclusively? Honestly, no! I'll still be reaching for GPT-5 and Sonnet when the situation calls for it. Being able to use all the best models with their best foot forward is what makes Cursor so great.
Composer is a new model we built at Cursor. We used RL to train a big MoE model to be really good at real-world coding, and also very fast.
cursor.com/blog/composer
Excited for the potential of building specialized models to help in critical domains.
retweeting this 2 hours late because my body could no longer handle all the excitement and slept till 2pm 🤯
coming from figma, arvid leaving reminds me of when evan wallace left. two generational engineers who are fully focused on their craft
cursor is now a huge business and not a small company, which often takes priority. so i can't wait to see what arvid gets up on his next thing!
the most awkward feeling in the world:
the flight attendant is asking the people in your aisle for their beverage selection, and you've taken out your headphones to wait expectantly
