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How to Spot Exceptional Talent Before Everyone Else

a16z’s Erik Torenberg sits down with Josh Elman, Olivia Moore, and David Booth to introduce Cosign, a new product built around professional reputation and the people, companies, and products you’re willing to put your name behind. They unpack a simple idea at the heart of Silicon Valley: some of the most valuable professional signals aren’t credentials, but who believes in you. From the mentor who shaped your career to the colleague you’d work with anywhere or the young builder you think everyone should be watching, Cosign is an attempt to make those signals more visible and durable. They also discuss why human endorsements may become more valuable as AI makes outreach and information abundant, what existing professional networks get right and miss, and how making reputation more legible could help talented people get discovered earlier, find collaborators, and carry the work they’ve done behind the scenes into whatever they do next. Timestamps: 00:00 - Intro 00:53 - What Cosign Is & Why It Exists 07:24 - The Three Signals: Mentors, Investors & Cosigns 10:27 - Building the Anti-LinkedIn: Talent Discovery Redesigned 16:36 - Why Reputation Should Be Granular, Not Generic 22:52 - The Feed: Questions, Announcements & Signal Density 28:41 - The Meme Dynamic: Public Cosigns as Social Capital 36:50 - Existing Platforms: Why LinkedIn & X Fall Short 44:03 - Silicon Valley as Meritocracy & the Power of Being First 49:33 - Closing Thoughts Resources: Follow Josh Elman on X: https://x.com/joshelman Follow Olivia Moore on X: https://x.com/omooretweets Follow David Booth on X: https://x.com/david__booth Follow Cosign: https://x.com/cosign_build Read more about Cosign: https://www.a16z.news/how-silicon-valley-knows-its-people Stay Updated: If you enjoyed this episode, be sure to like, subscribe, and share with your friends! Find a16z on X: https://twitter.com/a16z Find a16z on LinkedIn: https://www.linkedin.com/company/a16z Listen to the a16z Show on Spotify: https://open.spotify.com/show/5bC65RDvs3oxnLyqqvkUYX Listen to the a16z Show on Apple Podcasts: https://podcasts.apple.com/us/podcast/a16z-podcast/id842818711 Follow our host: https://x.com/eriktorenberg Please note that the content here is for informational purposes only; should NOT be taken as legal, business, tax, or investment advice or be used to evaluate any investment or security; and is not directed at any investors or potential investors in any a16z fund. a16z and its affiliates may maintain investments in the companies discussed. For more details please see http://a16z.com/disclosures.

Erik TorenberghostJosh Elmanguest
Sep 25, 202649mWatch on YouTube ↗

At a glance

WHAT IT’S REALLY ABOUT

Cosign turns hidden endorsements into durable signals for discovering standout talent

  1. Cosign is introduced as a free, startup-community-focused reputation directory designed to help people identify exceptional talent and companies before the broader market does.
  2. The product reframes professional credentialing from institutional brands (e.g., elite schools) to peer-to-peer signals and endorsements that open doors for hiring, investing, and collaboration.
  3. Cosign emphasizes granular reputation via structured cosigns—mentors who shaped you, people you’d work with “in the trenches,” and “people to watch”—to solve the low-signal nature of generic connections and follows.
  4. A curated feed of questions and announcements turns fleeting social-media validation into durable profile-based reputation, intentionally optimized for positivity and celebration rather than critique.
  5. The speakers argue that making conviction visible and portable can expand opportunity beyond founders and investors, giving operators and hidden contributors credit that travels with them across roles and companies.

IDEAS WORTH REMEMBERING

5 ideas

Cosign aims to productize social capital as a searchable reputation layer.

Cosign is positioned as a startup-community directory that makes “who believes in whom” legible—covering people, companies, and moments of endorsement that currently live across scattered networks and private DMs.

High-signal reputation requires intent-based, granular endorsements—not broad connection counts.

The product emphasizes three structured endorsement types—career shapers (mentors), “in the trenches” collaborators, and “person to watch”—because each conveys higher-intent information than generic follows or LinkedIn connections.

Conviction graphs reduce information asymmetry in hiring and investing.

They argue the most valuable Silicon Valley data is conviction: who has strong, credible belief in a person/company and why, which affects hiring, investing, and joining decisions—especially for newcomers without access to insider networks.

Private + public signaling can unlock high-intent matches without awkward DMs.

Cosign separates private intent (e.g., “I’d hire/fund this person”) from public cosigns (portable endorsements), enabling matching when timing is right without socially risky outreach (e.g., implying someone should leave their startup).

Existing platforms either lack relationship fidelity (LinkedIn) or durable context (X).

They criticize LinkedIn’s “single-signal” connection model as collapsing meaningful relationship differences (worked closely vs. met once), and they note X’s value is real but ephemeral and not organized for professional discovery.

WORDS WORTH SAVING

5 quotes

The most important skill in this town or in this industry or perhaps in the world is your ability to identify things before the market.

— David Booth

There are so many people in the world who we want to meet who also want to meet us, and it's just an information problem.

— Erik Torenberg

What's more impressive to you, someone who went to Stanford or someone who is followed by Patrick Collison, Elon Musk, Marc Andreessen?

— Erik Torenberg

In an age, I think of like endless, uh, kind of outreach and interest with AI, like the scarce thing is like the human endorsement or the human conviction or the human knowledge.

— Unknown

The benefits just accrue to you in the sense of people always remember, like by order of magnitude more, the people who believed in them first.

— Erik Torenberg

Cosign product overviewPeer-to-peer credentialing vs traditional credentialsThree endorsement signals: mentors, trenches, people-to-watchPrivate intent vs public cosignsDurable reputation from announcements and questionsLimitations of LinkedIn connections and X ephemeraSilicon Valley meritocracy and advantages of being first

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