Working notes from product people

Ask the people who’ve done it.

A free, searchable library of 1,799 of the best product-management essays, podcast episodes and posts, from Lenny Rachitsky, Marty Cagan, Teresa Torres and seven others, that answers your questions with citations.

For PMs, founders and anyone building products

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Answers quote and cite the source notes

Unofficial · not affiliated with any author · every note links to the original

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01 — Topics · the card catalogueBrowse by topic

Postfree essay or newsletter postPaidsubscriber post, summary onlyPodcastepisode with key learningsXpost on XHover a tag for the publication

3 more drawersBrowse all 14 topics →
Open drawer · 06

Leadership & management

563 notes · 139 people · 2005–2026
Lenny’s Podcast153 min

From ChatGPT to Instagram to Uber: The quiet architect behind the world’s most popular products

Peter Deng · Jun 22, 2025
Key learnings
  • Before scaling past product-market fit, invest in systems and architecture that let the team move sustainably faster, since…
  • Build a growth team early; a growth leader forces instrumentation and rigorous questioning of what is actually happening in the…
  • Balance growth-focused and craft-focused people deliberately, so the tension between metrics and product quality produces…
Lenny’s Podcast108 min

$46B of hard truths from Ben Horowitz: Why founders fail and why you need to run toward fear (a16z co-founder)

Ben Horowitz · Sep 11, 2025
Key learnings
  • Hesitation is usually the most destructive leadership mistake; when both options look bad, make an explicit decision rather than…
  • Leaders add real value only when they make decisions most people disagree with; if everyone agrees, the leader added nothing.
  • Success is built from a long chain of small, hard decisions, and each good choice sets up the next, so keep making the next one.
@joulee · Julie Zhuo on X♥ 228
Too many teams are doing AI transformation poorly, so I wrote down everything I have learned in my journey and in chatting with many other leaders. A long read, so get your coffees.
Lenny’s Podcast105 min

Hard truths about building in the AI era

Keith Rabois · Apr 12, 2026
Key learnings
  • Build the team first: Rabois argues the team you assemble determines the company you build, so hiring quality outranks market…
  • Check hires 30 days after they join by asking whether you would make the same decision again; he says this short loop predicts…
  • Run ruthless referencing with many references per senior hire, and frame questions around whether the person can be a world-class…
Lenny’s Podcast102 min

Lessons from scaling Stripe

Claire Hughes Johnson · Mar 5, 2023
Key learnings
  • Start with self-awareness: seek feedback on your motivators, strengths, and blind spots, and share them with your team, since…
  • Introduce job levels and career ladders earlier than feels necessary; waiting until a company is large makes the change far more…
  • Treat company-building infrastructure as essential, not optional: product-market fit alone won't scale, and weak structures and…
Lenny’s Podcast82 min

How Netflix builds a culture of excellence

Elizabeth Stone · Feb 22, 2024
Key learnings
  • Economics framing, especially thinking through incentives and unintended consequences, is a useful lens for product and business…
  • Hold a high personal bar: be responsive, follow through on commitments, and show up on time so colleagues are not left waiting on…
  • Give high-standard feedback in private and specific terms, then help the person close the gap by working on the work with them…
@ttorres · Teresa Torres on X♥ 9
🎙️Facilitation Skills Conflict on a product team isn't a warning sign — the absence of it usually is. In this episode of All Things Product, Petra Wille and Teresa Torres tackle a question Teresa hears constantly: what should a product trio do when collaboration breaks down and disagreement turns…

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 Newsletter110 free posts, with a longer excerpt.
Subscriber postsSummary only233 paid posts: our summary, at most two short quotes, and a link.
PodcastLenny’s Podcast323 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 product66 posts, filtered for product relevance.