Product thinking, out loud
Learn to think like a product leader — not memorize like a candidate.
Interview prep, first-principles product teardowns, and real-world lessons for building in the AI era. Free. No course to buy, no wall to hit.
Three ways in
Everything here is built to make you a sharper thinker — whether you're prepping for an interview next week or shaping a roadmap next quarter.
01
Interview Prep
Get through the loop without a script
Product sense, estimation, execution, and behavioral rounds — with the mental models that survive follow-up questions.
Explore prep →02
First-Principles Teardowns
Why is it shaped like that?
We take an everyday object — a bottle, a cart, a notification — strip it to first principles, and redesign it from scratch.
Read teardowns →03
AI-First PM
Product management, rewired by AI
What changes when the marginal cost of a feature approaches zero — and what the PM job becomes when the model does the building.
Go AI-first →Featured
Start here
Teardown
Why is a water bottle shaped like that?
The classic "design a bottle" interview question, taken seriously — constraints, jobs-to-be-done, and five bottles that don't exist yet.
14 min read →Guide
The product-sense answer that survives follow-ups
Most candidates memorize a framework and fall apart on the second question. Here's how to reason so the interviewer can't corner you.
Read the guide →What this site is
Most product-management content is either a listicle written to rank, or a course written to sell. This is neither. It's a working notebook of how a product leader actually reasons — the questions worth asking, the trade-offs nobody puts on a slide, and the small observations that turn into good product decisions.
The premise is simple: product management is a thinking discipline before it's a process one. You can memorize CIRCLES and STAR and RICE and still give shallow answers, because frameworks are scaffolding, not thought. So we practice the thing underneath — taking something ordinary, asking why it is the way it is, and imagining what else it could be. Do that often enough and interview questions stop feeling like traps.
Pick a rabbit hole.
Three pillars, no dead ends. Every piece links to the next question worth asking.