Working notes from product people

Ask the people who’ve done it.

Q:
Answers quote and cite the source notes

01 — TopicsFourteen drawers, sorted.

3 more drawersBrowse all 14 topics →
Open drawer · 01

Product strategy & vision

610 notes · 121 people · 2005–2026
The Looking Glass · Julie Zhuo♥ 40

What will make personal AI go big?

Sep 24, 2026
Subscriber post — summary only

Julie Zhuo reflects on Muse, a consumer AI agent she believes could actually change people's everyday habits. The essay, which is paywalled, argues that a few specific design choices explain why personal AI might…

@hnshah · Hiten Shah on X♥ 23
If you work on a B2B product, product marketing is probably already part of your job whether or not it’s in your title. It shows up when something you learn from the market changes how the product gets explained or sends the team back into the product. Friday at 10 AM PT I’m
Lenny’s Podcast102 min

How we built Grok Bot in a month

Roman Ugarte · Sep 8, 2026
Key learnings
  • Build a new product from scratch with a small, isolated team rather than retrofitting an existing surface, so each micro-decision…
  • Onboard early users by hand and sit in on calls; fixing failures the same day compresses learning dramatically.
  • Let users reveal patterns on their own before productizing them, then gently encourage the winning patterns without making them…
SVPG · Marty CaganSep 11, 2026

Strong Opinions, Loosely Held

Sep 11, 2026 · 10 min

Marty Cagan revisits the foundational product-management ideas he publicly argued for over the past two decades and identifies ten significant mistakes or blind spots. He concludes that his earlier emphasis on…

@hnshah · Hiten Shah on X♥ 30
We asked Claude what changed among Linear's competitors. No skills: an old source treated as recent, and a guess stated as fact. Same model, with our competitive skills installed: every claim dated, the ranking marked as its own view, and a line about what it could not see.

02 — FrameworksModels, annotated.

All frameworks →

03 — PeopleWho wrote the notes.

All 10 people →

04 — QuestionsAnswered from the notes.

All 32 questions →

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.