Jessica Livingston (co-founder of Y Combinator, author, podc27 June 2024

The social radar: Y Combinator’s secret weapon

4Frameworks

14Insights

Episode overview

Jessica Livingston explains how her attention to social cues complemented her technical Y Combinator co-founders and helped the team assess founder relationships, commitment, defensiveness, earnestness, and resourcefulness. She illustrates that judgment through early investments in Airbnb, GOAT, Zenefits, and other startups while acknowledging that brief interviews and intuition can still fail. Livingston also discusses creating The Social Radars podcast, what she has learned about interviewing, and the formative early years of Y Combinator.

Key ideas

Early-stage founder evaluation should combine technical judgment with close observation of social dynamics, motivation, and authenticity.
Defensiveness is a warning sign because founders need to learn from criticism, educate skeptics, and adapt when users reveal a better direction.
Strong signals include earnestness, domain expertise, confidence without bluffing, and evidence that founders are relentlessly resourceful.
Founder commitment often requires eventually leaving the security of another job and making the startup the primary responsibility.
Long-standing co-founder relationships reduce risk because trust, shared history, and familiarity with one another's strengths and weaknesses matter under pressure.
Airbnb's founders overcame skepticism about their idea by showing exceptional energy and hustle, symbolized by their handmade Obama O's and Captain McCain's cereal boxes.
A practical way to improve one's social radar is to consciously review how founders answer questions, handle disagreement, understand their product, and interact with each other.
The Social Radars aims for trusting, informal conversations in which founders can share candid stories without fear of a gotcha interview.

Transcript available · source text is retained privately and is not published

Frameworks in this episode

Strategy3 steps

Bet on the Founders, Not the Idea

At the seed stage the idea will change, so fund the people who will make something work no matter what.

Read →

Influence5 steps

Building Your Own Social Radar

Turn people-reading from a mystery gift into a deliberate practice: checklist, conscious questions, and follow-up calibration.

Read →

Entrepreneurship6 steps

The Social Radar Founder-Read

Read the human signals in a founder interview to catch red flags the idea-focused people miss.

Read →

Communication4 steps

The Trust-First Interview Method

Talk less, promise review before publishing, and follow the tangents — so guests open up and the conversation goes somewhere real.

Read →

People & resources mentioned

Attributed to the moment in the episode. Timestamps are approximate.

People · 30

Paul GrahamMentionsPaul Graham talks about this too right just like live in the future and build it
“I want to start with a a quote by someone you may know, Paul Graham.”
▶ Watch at ~0:00approx.
Jessica LivingstonMentionsToday my guest is Jessica Livingston. Jessica is the co-founder of Y Combinator
“Today my guest is Jessica Livingston. Jessica is the co-founder of Y Combinator”
▶ Watch at ~1:00approx.
Lenny RachitskyMentionstoday we've got another very special compilation episode something I've been pulling on more and more with the podcast and the newsletter
“Thanks, Lenny. I'm glad to be here.”
▶ Watch at ~2:30approx.
Robert MorrisMentionsPaul, Robert, and Trevor, or my co-founders
“Paul, Robert, and Trevor, or my co-founders would be asking them all sorts of questions about their product”
▶ Watch at ~10:30approx.
Trevor BlackwellMentionsPaul, Robert, and Trevor, or my co-founders
“Paul, Robert, and Trevor, or my co-founders would be asking them all sorts of questions about their product”
▶ Watch at ~10:30approx.
Brian CheskyMentionsBrian chesky at Airbnb there was a whole article where we unpacked this moment in their product development cycle
“Paul tried to get Brian and Joe and Nate to change it”
▶ Watch at ~22:00approx.
Nathan BlecharczykMentionsI want you to be my in-house mentor for both me and Joe and and Nate.
“Paul tried to get Brian and Joe and Nate to change it”
▶ Watch at ~22:00approx.
Joe GebbiaMentionsAt Airbnb, he discussed employees identifying with both their discipline and cross-functional team.
“at the end Joe brought out these like the cereal boxes”
▶ Watch at ~22:00approx.
Daishin SuganoMentionsmentioned
“when Eddie and Darshan applied they were not doing sneaker company”
▶ Watch at ~27:00approx.
Eddy LuMentionsmentioned
“when Eddie and Darshan applied they were not doing sneaker company”
▶ Watch at ~27:00approx.
Drew HoustonMentionseven when I first started talking with with Drew before I came in
“like in the case of Dropbox, Drew and Arash, you know, both went to MIT”
▶ Watch at ~37:00approx.
Arash FerdowsiMentionsmentioned
“like in the case of Dropbox, Drew and Arash, you know, both went to MIT”
▶ Watch at ~37:00approx.
Ilya LichtensteinMentionsIlya Lichtenstein of MixRank
“Ilya Lichtenstein of MixRank. Do you know the guy that like stole billions of dollars in Bitcoin”
▶ Watch at ~46:00approx.
Sean HayesMentionsa podcast hosted by three actors, Jason Bateman, Will Arnett, and Sean Hayes
“a podcast hosted by three actors, Jason Bateman, Will Arnett, and Sean Hayes.”
▶ Watch at ~56:00approx.
Will ArnettMentionsa podcast hosted by three actors, Jason Bateman, Will Arnett, and Sean Hayes
“a podcast hosted by three actors, Jason Bateman, Will Arnett, and Sean Hayes.”
▶ Watch at ~56:00approx.
Jason BatemanMentionsa podcast hosted by three actors, Jason Bateman, Will Arnett, and Sean Hayes
“a podcast hosted by three actors, Jason Bateman, Will Arnett, and Sean Hayes.”
▶ Watch at ~56:00approx.
Carolynn LevyMentionsmy colleague and friend Carolyn Levy, who of course has a full-time job being one of the amazing lawyers within YC
“I convinced my colleague and friend Carolyn Levy”
▶ Watch at ~57:30approx.
Emmett ShearMentionsmentioned
“Emmett Shear, by the way, the week after he was named OpenAI CEO for like 72 hours”
▶ Watch at ~59:30approx.
Patrick CollisonMentions“there's this tweet by Patrick hollison that I've brought up a couple times on this podcast”
“Patrick and John Collison, Brian Chesky, you mentioned Brian Armstrong, Emmett Shear, Tony Xu, like epic people.”
▶ Watch at ~59:30approx.
John CollisonMentionsJohn and Patrick were the first marketers at Stripe because they were developers themselves.
“Patrick and John Collison, Brian Chesky, you mentioned Brian Armstrong, Emmett Shear, Tony Xu, like epic people.”
▶ Watch at ~59:30approx.
Brian ArmstrongMentionseventually I met folks like Naval ravikot and Sam Altman and Brian Armstrong and they recommended me around
“you mentioned Brian Armstrong, Emmett Shear, Tony Xu, like epic people.”
▶ Watch at ~59:30approx.
P. G. WodehouseCoinedhe was an you know, old old school author
“my first, second, and third books would all be P.G. Wodehouse books.”
▶ Watch at ~1:10:30approx.
Keith RichardsCoinedmentioned
“Keith Richards, his autobiography called Life, is really good if you're a fan of the Rolling Stones at all.”
▶ Watch at ~1:11:30approx.
Barbra StreisandCoinedmentioned
“I recently read Barbara Streisand's biography called I think it's called My Name Is Barbara”
▶ Watch at ~1:12:00approx.
Jeremy ClarksonMentionsJeremy Clarkson, he's in what in a show called Top Gear
“Jeremy Clarkson, he's in what in a show called Top Gear.”
▶ Watch at ~1:13:00approx.
Michael PollanMentionsmichael pollan has this point that he makes that like cliches and platitudes are cliches and platitudes because we've heard them so many times
“I think it was Michael Pollan that said that clichés are clichés cuz they're so true.”
▶ Watch at ~1:14:30approx.
Steve HuffmanMentionsmentioned
“that first summer had Sam Altman, Emmett Shear and Justin Kan, Alexis and Steve of Reddit.”
▶ Watch at ~1:20:30approx.
Sam AltmanMentionsthere's everybody has uh and had and continues to have like such deep trust in in Sam and Greg and our leadership team
“that first summer had Sam Altman, Emmett Shear and Justin Kan, Alexis and Steve of Reddit.”
▶ Watch at ~1:20:30approx.
Alexis OhanianMentionsmentioned
“that first summer had Sam Altman, Emmett Shear and Justin Kan, Alexis and Steve of Reddit.”
▶ Watch at ~1:20:30approx.
Justin KanMentionsmentioned
“that first summer had Sam Altman, Emmett Shear and Justin Kan, Alexis and Steve of Reddit.”
▶ Watch at ~1:20:30approx.

Resources · 29

Y CombinatorCoinedcompany · Paul Graham and co-founders
“Jessica is the co-founder of Y Combinator, the first and most famous startup accelerator”
▶ Watch at ~1:00approx.
InstacartMentionscompany · Apoorva Mehta, Max Mullen, and Brandon Leonardo
“including companies like Airbnb, Stripe, DoorDash, Coinbase, Dropbox, Instacart, Reddit.”
▶ Watch at ~1:00approx.
StripeMentionscompany · Patrick Collison and John Collison
“including companies like Airbnb, Stripe, DoorDash, Coinbase, Dropbox, Instacart, Reddit.”
▶ Watch at ~1:00approx.
CoinbaseMentionscompany · Brian Armstrong and Fred Ehrsam
“including companies like Airbnb, Stripe, DoorDash, Coinbase, Dropbox, Instacart, Reddit.”
▶ Watch at ~1:00approx.
Founders at WorkCoinedbook · Jessica Livingston
“Jessica is also the author of one of the best-selling books about startups, Founders at Work”
▶ Watch at ~1:00approx.
Reading the Mind in the EyesRecommendsother
“There's actually a quiz that I'm going to link to in the show notes called Reading the Mind in the Eyes”
▶ Watch at ~1:30approx.
The Social RadarsCoinedpodcast · Jessica Livingston and Carolynn Levy
“hosts the Social Radars podcast.”
▶ Watch at ~1:30approx.
Silicon ValleyMentionsplace · Mike Judge, John Altschuler, and Dave Krinsky
“people I respect in the in the Silicon Valley community know what I've done.”
▶ Watch at ~4:00approx.
InterpretMentionssoftware
“This episode is brought to you by Interpret.”
▶ Watch at ~5:00approx.
AnvilMentionssoftware · Anvil
“This episode is brought to you by Anvil. Their document SDK helps product teams build and launch software for documents fast.”
▶ Watch at ~6:00approx.
BookfaceUsessoftware · Y Combinator
“if you ask a question on Bookface on our, you know, forum for founders, someone is going to be there to help you.”
▶ Watch at ~14:30approx.
PayPalMentionscompany · Max Levchin, Peter Thiel, and Luke Nosek
“The famous like PayPal story how did how it started off being you know the Palm Pilot”
▶ Watch at ~19:30approx.
AirbnbMentionscompany · Brian Chesky, Joe Gebbia, and Nathan Blecharczyk
“I remember can I tell the story about the Airbnb interview”
▶ Watch at ~21:00approx.
GOATMentionscompany · Eddy Lu and Daishin Sugano
“do you know the company Goat the sneaker”
▶ Watch at ~27:00approx.
DropboxMentionscompany · Drew Houston and Arash Ferdowsi
“like in the case of Dropbox, Drew and Arash, you know, both went to MIT”
▶ Watch at ~37:00approx.
VantaMentionssoftware · Christina Cacioppo
“This episode is brought to you by Vanta.”
▶ Watch at ~39:00approx.
GrubwithusMentionscompany · Eddy Lu and Daishin Sugano
“there was definitely a period when Grub With Us, their first startup, wasn't doing well”
▶ Watch at ~44:00approx.
MixRankMentionscompany · Ilya Lichtenstein and Scott Milliken
“Ilya Lichtenstein of MixRank.”
▶ Watch at ~46:00approx.
SmartLessMentionspodcast · Jason Bateman, Will Arnett, and Sean Hayes
“I became obsessed with this podcast called SmartLess.”
▶ Watch at ~56:00approx.
OpenAIMentionscompany
“Emmett Shear, by the way, the week after he was named OpenAI CEO for like 72 hours”
▶ Watch at ~59:30approx.
LifeRecommendsbook · Keith Richards with James Fox
“Keith Richards, his autobiography called Life, is really good if you're a fan of the Rolling Stones at all.”
▶ Watch at ~1:11:30approx.
My Name Is BarbraRecommendsbook · Barbra Streisand
“I recently read Barbara Streisand's biography called I think it's called My Name Is Barbara”
▶ Watch at ~1:12:00approx.
Top GearMentionstv show
“Jeremy Clarkson, he's in what in a show called Top Gear.”
▶ Watch at ~1:13:00approx.
Clarkson's FarmRecommendstv show · Jeremy Clarkson
“My favorite new TV show, just off the top of my head right now, is Clarkson's Farm.”
▶ Watch at ~1:13:00approx.
Summer Founders ProgramCoinedevent · Y Combinator
“we invited people to participate in the summer founders program which is what it was called.”
▶ Watch at ~1:20:00approx.
Demo DayMentionsevent · Y Combinator
“bring in guest speakers and and then introduce them to investors at demo day”
▶ Watch at ~1:20:30approx.
RedditMentionswebsite · Steve Huffman, Alexis Ohanian, and Aaron Swartz
“I remember when Reddit got bought by Conde Nast in 2006”
▶ Watch at ~1:21:00approx.
The Social RadarsRecommendspodcast · Jessica Livingston and Carolynn Levy
“you check out the Social Radars on all the you know, podcast platforms.”
▶ Watch at ~1:23:30approx.
Lenny's PodcastCoinedpodcast · Lenny Rachitsky
“You can find all past episodes or learn more about the show at lennyspodcast.com.”
▶ Watch at ~1:24:30approx.

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Insights & moments

The myth-busts, hot takes, explainers, and tools worth keeping.

Myth Buster· 1

Myth Buster29:00

Don't Get Fooled by Charisma

Jessica pushes back on charisma as a signal of a good founder. Plenty of charismatic people are full of baloney and doing a startup because it's cool, so there has to be substance behind the charm. Some of the best founders are actually uncharismatic but know their user and their problem deeply.

Charisma without substance is a trap that fools investors.
Some uncharismatic people are excellent founders when they care about the user and the problem.
Charisma does help because founders must sell to recruits, investors, and users.

“I hate using the word charisma because I wouldn't there are a lot of charismatic people who are are full of baloney”
Jessica Livingston · 29:00

#charisma#founders#evaluation#myths

Hot Take· 1

Hot Take34:30

You Have to Burn the Boat

Jessica says starting a startup on the side is fine at first, but at some point founders must commit and quit their jobs. YC found that founders still drawing a paycheck and health insurance didn't quit when things got hard, and often that co-founder left the company. You need the desperation of having no fallback.

Building on the side is a fine way to get going before raising money.
Founders who kept their jobs tended to bail when the going got tough.
That healthy desperation ('this has to succeed, it's my job') is a needed forcing function.

“But at some point you have to commit. You have to burn the boat”
Jessica Livingston · 35:00

“like you sort of need that desperation”
Jessica Livingston · 35:30

#commitment#founders#startups#risk

Explainer· 2

Explainer16:30

Defensiveness Is Always a Bad Sign in a Founder

The clearest interview red flag for Jessica was a founder who got defensive when her co-founders probed their idea. The best founders instead treated tough questions like a tennis match and stayed open-minded, because startups constantly get questioned and the first idea is rarely right.

Defensiveness signals a founder who can't educate skeptics or adjust their idea.
She cites PayPal's pivot from Palm Pilot money transfer to the web as why open-mindedness matters.
The best founders keep listening and having spirited debates rather than closing up.

“if a founder would get defensive, that was always a bad sign. Always a bad sign.”
Jessica Livingston · 16:30

“but the best founders are always listening and having spirited debates about things”
Jessica Livingston · 20:30

#founders#red-flags#evaluation#open-mindedness

Explainer46:30

Why 10 Minutes Is All YC Needs

Jessica explains that a lot of the judgment comes from reading the application first, so the 10-minute interview is usually enough. When YC tried longer 20-minute interviews, they'd already know by the 10-minute mark and spend the rest twiddling their thumbs, so short interviews let them see more founders.

Much of the assessment happens while reading the application beforehand.
In 20-minute interviews they usually knew the answer within 10 minutes.
Short interviews let YC evaluate far more teams.

“But then the 10 minutes is kind of as long as you need in most cases cuz we found when they were longer like 20…”
Jessica Livingston · 47:00

#y-combinator#interviews#process#evaluation

Story· 7

Story03:30

Why Jessica Gets Erased From the YC Story

Jessica reflects on being a Y Combinator co-founder who is routinely left out of news articles and even nudged off Wikipedia. She argues part of it is a convenient narrative: some people prefer to believe YC is run by and invests only in white men, and a female founder making funding decisions undermines that story.

People repeatedly try to remove her Wikipedia entry despite her being a YC co-founder and best-selling author.
She says the external view doesn't matter to her because YC alumni, colleagues, and the Silicon Valley community know what she did.
She believes some erase her because a woman choosing who to fund contradicts the 'run by white men' narrative about YC.

“gosh, I'm a founder of Y Combinator, author of a best-selling book on startups. You know, what does a girl have to do?”
Jessica Livingston · 03:30

#y-combinator#founders#recognition#women-in-tech

Story21:00

The Airbnb Cereal Boxes That Won the Interview

In the strict winter '09 batch after the market crash, YC hated Airbnb's idea but was won over by the founders' energy. Joe pulled out the Obama O's and Captain McCain's cereal boxes they'd hand-assembled, and Jessica knew these founders would do whatever it took to succeed.

YC was only funding scrappy 'cockroach' founders who could live on very little money.
They disliked the air-bed idea itself but bet on the founders.
The glue-gunned off-brand cereal boxes convinced Jessica of the founders' relentless hustle.

“we hated their idea and Paul tried to get Brian and Joe and Nate to change it”
Jessica Livingston · 22:00

“oh my god these guys are really like going to great lengths for this”
Jessica Livingston · 22:30

#airbnb#y-combinator#hustle#founders

Story27:00

Backing the Goat Founders Before They Found Goat

Jessica pushed the group to fund Eddie and Darshan when they applied with a group-dinner idea, not the sneaker marketplace. She loved the founders' passion and their stories of running a hard cream-puff company earlier, and bet they were hustlers who'd make it work. The dinner idea failed but they pivoted into Goat.

This was one of the rare times she persuaded the group to fund someone the others were lukewarm on.
She read them as scrappy hustlers based on their earlier company's hard-won stories.
Their original idea failed but they pivoted into Goat, which is doing very well.

“these are hustlers these guys are scrappy they're going to make this succeed”
Jessica Livingston · 27:30

#goat#founders#pivot#hustle

Story45:30

The Bitcoin Thief Her Radar Missed

Asked if she'd ever been tricked, Jessica shares the one example she's comfortable naming: Ilya Lichtenstein of MixRank, who was later convicted of stealing billions of dollars in Bitcoin from a crypto wallet. She never sensed anything bad about him, a reminder that even a great social radar misses some people.

Ilya Lichtenstein of MixRank was convicted of a massive Bitcoin theft.
She recalls no bad feeling about him at the time.
She admits she gets tricked in small ways all the time given 10-minute interviews.

“Um Ilya Lichtenstein of MixRank. Do you know the guy that like stole billions of dollars in Bitcoin from a crypto wallet?”
Jessica Livingston · 46:00

#social-radar#misjudgment#y-combinator#crypto

Story52:00

Beating Paul Graham on the Eyes Quiz

Paul Graham emailed Jessica late one night bragging he scored 25/36 on the 'Reading the Mind in the Eyes' quiz, where you judge emotions from just a person's eyes. Determined to beat him, she got up, took it, and scored a perfect 36/36. After Paul tweeted it, about ten people at a YC London event came up asking her secret.

The quiz shows only the eyes and asks you to identify subtle emotions like irritated versus angry.
Jessica scored a perfect 36/36; the highest Lenny's friends managed was 31.
Her trick is asking 'what are they trying to communicate to me?' when looking into the eyes.

“And when I got 36 out of 36, I was like, "Yes!"”
Jessica Livingston · 53:30

#social-radar#empathy#quiz#reading-people

Story1:04:30

Setting the Record Straight on Parker Conrad

The podcast episode that sticks with Jessica most is Parker Conrad's, where they revisited how the press annihilated him over Zenefits. She learned it involved a smear campaign paid for by someone still at the company, legal threats, and planted stories, and she was glad to be a conduit to set the record straight even though no reporter ever recanted.

There was a smear campaign paid for by someone still at Zenefits.
Legal threats tried to force a California non-compete so he couldn't start another company.
No reporter ever corrected the record; Parker moved on to Rippling but Jessica still cares about the injustice.

“if you didn't follow uh that story years ago, the press annihilated him”
Jessica Livingston · 1:04:30

#parker-conrad#zenefits#press#podcasting

Story1:22:00

How Not Knowing How to Invest Created YC

None of the YC founders had angel investing experience, so they funded a batch of startups at once during the summer just to learn how to invest. The plan was to switch to normal asynchronous investing afterward, but they realized the batch model was magical, and that inexperience became YC's defining structure.

The summer founders program was a way to learn investing by doing many at once.
They intended to move to conventional one-off investing later.
The batch created friendships, weekly dinners, and demo day, so they kept it: ignorance turned out to be bliss.

“sometimes maybe ignorance is sort of bliss and you just discover new things”
Jessica Livingston · 1:23:00

#y-combinator#batch-model#origins#investing

Takeaway· 3

Takeaway30:30

Earnestness Is What She Really Looked For

Jessica calls earnestness, bucketed with authenticity, one of the most important founder traits. Successful founders care deeply about the problem and users, versus want-to-be founders chasing an idea because it's cool. She recalls 45-year-old men building a teen fashion app purely to make easy money as the opposite of earnest.

Earnest founders care intensely about the problem and the users they serve.
Earnestness shows as humility and honesty, including admitting when they don't know an answer.
The teen-fashion example was a made-up idea chasing easy money, not a real need.

“to be a successful startup founder, you have to care so much about the problem you're trying to solve”
Jessica Livingston · 30:30

“It was just like they made up the idea.”
Jessica Livingston · 32:00

#earnestness#authenticity#founders#evaluation

Takeaway36:00

Why Co-Founder History Matters So Much

Jessica spent much of her YC time mediating co-founder disputes, and many startups died or nearly died when founders broke up. In interviews she hunted for signs they didn't get along, and strongly preferred co-founders with a shared history, from school, work, or family, because trust and aligned aspirations are already there.

So many startups had near-death experiences from co-founders not getting along.
Signs of trouble: contradicting each other; good signs: finishing each other's sentences.
Two founders who teamed up just to do a startup with no shared history is a massive red flag, though it occasionally works (Dropbox).

“You know, like I love co-founders that have a history together.”
Jessica Livingston · 36:30

“It's really scary when two founders get together just to start the startup and don't have any history. That that massive red flag.”
Jessica Livingston · 37:00

#co-founders#team#red-flags#founders

Takeaway1:00:30

The Host Should Talk Less

Jessica's hardest-won podcasting lesson is that she talks way too much, calling herself a huge windbag. Editing her own episodes she'd hear herself ask a question in 20 sentences when two would do, so she trained herself to keep her talking frequent but short, and to interrupt guests who ramble.

She only noticed the over-talking when editing and listening back to herself.
Keep host dialogue frequent but short.
Interrupt guests when they go on too long.

“is that I'm I talk way too much. I'm a huge windbag”
Jessica Livingston · 1:01:00

“the talking of the host should be frequent but short”
Jessica Livingston · 1:01:30

#podcasting#interviewing#lessons#craft

Key ideas

Frameworks in this episode

Bet on the Founders, Not the Idea

Building Your Own Social Radar

The Social Radar Founder-Read

The Trust-First Interview Method

People & resources mentioned

People · 30

Resources · 29

Insights & moments

⚡Myth Buster· 1

Don't Get Fooled by Charisma

◆Hot Take· 1

You Have to Burn the Boat

✶Explainer· 2

Defensiveness Is Always a Bad Sign in a Founder

Why 10 Minutes Is All YC Needs

❝Story· 7

Why Jessica Gets Erased From the YC Story

The Airbnb Cereal Boxes That Won the Interview

Backing the Goat Founders Before They Found Goat

The Bitcoin Thief Her Radar Missed

Beating Paul Graham on the Eyes Quiz

Setting the Record Straight on Parker Conrad

How Not Knowing How to Invest Created YC

▲Takeaway· 3

Earnestness Is What She Really Looked For

Why Co-Founder History Matters So Much

The Host Should Talk Less

Myth Buster· 1

Hot Take· 1

Explainer· 2

Story· 7

Takeaway· 3