Stack Trace
Jack ArenasPerspectives from a builder turned backer.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 18 | Subscribers | Read | jackarenas.substack.com |
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Latest Issues
Recent posts by this newsletter. Browse the email archive.
Eval-Driven Development
I’ve written before that evals might be the most valuable layer in the AI stack. Not models, not agents: evals. They’re the thing that defines what “better” even means.
Adapting Foundation Models: From Prompts to Reinforcement Learning
In 2012 I took Pieter Abbeel’s CS 188 class at Berkeley. We used reinforcement learning to play Pacman with Q-tables. The loop was straightforward: take an action, record the outcome, update the table.
When Chat Replaces Search: The Economics of AI-Mediated Information
Back in 2015, I was a software engineer building the invisible infrastructure that turned attention into money. Not the polished front end users saw, but the backend systems that bought, sold, and measured ads in milliseconds.
The Promptware Window
Every week I see pitches that follow a similar pattern: “X for Y, powered by AI.” The demos look slick. The traction slides show early revenue. But peel back the layers, and it’s often the same thing: a foundation model wrapped in a clever ...
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Principal at Founder Collective
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