Working notes from product people

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01 — TopicsFourteen drawers, sorted.

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Open drawer · 02

Discovery & customer research

536 notes · 32 people · 2005–2026
@hnshah · Hiten Shah on X♥ 35
We asked Claude what changed with Linear’s competitors. The first answer used an old source as if it were recent. It also stated a guess as fact. Then we gave the same model our competitive skills. It showed its limits up front. It explained how it ranked the changes and kept
Lenny’s Podcast97 min

"Sell the alpha, not the feature": The enterprise sales playbook for $1M to $10M ARR

Jen Abel · Nov 9, 2025
Key learnings
  • Founder-led sales is a competitive advantage because founders are the visionary and can spot budding insights that salespeople…
  • Write cold outreach that leads with relevance, a counterintuitive insight, and the problem rather than the solution, kept to…
  • Before buying tools, manually find and write thoughtful notes to about 30 prospects; use the response pattern to refine messaging…
Product Talk · Teresa TorresSep 21, 2026

Ch. 10: Testing Assumptions

Sep 21, 2026 · 5 min

This reading guide kicks off a monthly book club celebrating five years of Continuous Discovery Habits, focused this month on Chapter 10, 'Testing Assumptions.' The guide frames the chapter as a bridge between…

@lennysan · Lenny Rachitsky on X♥ 1,037
Trend I'm following: Teams using AI "simulations" to quickly test product ideas and flow tweaks. Products like @simile_ai, @primitivelabsai, @syntheticusers, and others. If you've tried something like this, how'd it go?

02 — FrameworksModels, annotated.

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03 — PeopleWho wrote the notes.

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04 — QuestionsAnswered from the notes.

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Where notes come from

NewsletterLenny’s Newsletter106 free posts, with a longer excerpt.
Subscriber postsSummary only229 paid posts: our summary, at most two short quotes, and a link.
PodcastLenny’s Podcast322 episodes, each with 5–8 key learnings and timestamps.
EssaysSVPG · The Beautiful Mess499 essays from Marty Cagan and John Cutler.
Substack & blogsShreyas · Julie · Jason · Hiten577 essays and posts from independent writers.
XPosts on product58 posts, filtered for product relevance.