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Ask people who've lived it
Ask a quick question
I'm a software engineer scared AI will replace me
My best performer has been missing deadlines for two months straight
I want to start a design system but don't know if I need code or just a Figma file
I'm ending a six year client relationship and I don't know what to say
My shoulder's been aching for a week but I don't want to lose my lifting streak
My instagram following has been stuck at 800 for two years and I don't know what moves the needle
Ask the experts
Lorraine on getting noticed for your work“Doing great work doesn’t guarantee recognition. Make your impact easy to explain so people can advocate for you when you’re not in the room.”
Guillermo on building Vercel and Next.js“The best things we've done for our brand is the things that we did without thinking we're working on our brand.”
Pedro on where machine learning is headed“The same basic paradigms have been used since the 1950s. At the end of the day, we’re going to need some new ideas.”
Hal on keeping a morning routine alive after a bad night“I learned the hard way that my routine survives only when I make it so small that a bad day can't break it, like doing the 6-minute Miracle Morning instead of an hour.”
Spencer on life inside an NBA organization“I used to think pushing past your body meant toughness, but the league taught me that the hardest skill is staying on the floor.”
Nir on the science of living longer“To delay the biology of aging, we don't prevent just one disease, we prevent many of them. We used to think each age-related disease was separate, but they share common roots. Longevity becomes a side effect of staying healthy longer.”
Vinod on which jobs AI will replaceLed KV's first OpenAI investment and juniper Networks: 2,500x return.
Jason on when to keep fighting and when to wind down“I’ve seen this movie too many times: four months of runway with flat sales usually means the founder never found a repeatable motion, not that the market said no.”
Lenny on breaking into product management“A few paths actually work. The safest is transitioning internally, partnering closely with a PM until you can make the case. The second is joining an early-stage startup where everyone does everything. Regardless of path, become the person who deeply understands the customer and can translate that into product insight.”
Stanley on finding initial traction“Your first customers don’t need a scalable solution. They need their problem solved. Do it manually until you understand what’s worth building...”
Vanessa on sexual expectations couples never say out loud“I don't believe in a universal normal for any stage, but I do think it's completely natural for that early honeymoon frequency to taper off after about a year.”
Jessi on deciding what comes first when everything is urgent“I learned in hospice that when everything feels urgent, the first thing is to steady my own nervous system so I can see what is actually life-or-death and what only feels that way.”
Moses on making it to the top when you started with nothing“I had love for the game, parents who kept me grounded, and a city that taught me how to compete. What kept me going was consistency and curiosity. You control what you can control, stack good days, and let the game reward you when it's time.”
Nick on metabolic health, nutrition, and brain healthHarvard MD, Oxford PhD, Dartmouth valedictorian and #2 Science Bestseller on Substack.
Andrej on how far we are from AGILed Tesla Autopilot computer vision team and founding member of OpenAI.
Deena on raising venture money as an underestimated founder“Do your homework on who you're pitching. Most founders spray and pray, but that wastes everyone's time. And bring your full self to the conversation. The intersectional, the immigrant, the nontraditional founder, those backgrounds are not weaknesses. They're edges. The data shows diverse founding teams build better businesses. But you have to own it.”
Alastair on handling a teammate who undermines you in meetings“I would name the pattern in private first: I noticed you agreed in the room, then raised concerns afterwards. If you disagree, raise it in the meeting so we can deal with it straight away.”
Tim on picking investors for a first raise“Start with angels and seed funds who actually write checks at the idea stage, because most VCs won't touch you until you have traction or a warm intro.”
Matthew on finding the right partner“You want to be happy enough that the right thing doesn’t become your everything.”
Julian on using a system to curb phone distractions“I don't try to restart at full speed; I drop back to the mínimo viable version of each habit until the momentum returns, because a 20-minute workout and one focused block on the side project beats another day of zero.”
Ask about real life
I gave a candidate a 45-minute take-home and got back code that looked like it came from a senior engineer with ten years of experience. When I asked her to walk through her own logic, she froze on the second question. Do I fail her for that or give her a shot to explain?
I tried out for the varsity squad after two years on JV and got cut in the final round. The coach said I was close but not ready. I don't know if I try again next year or find something else to do with my afternoons
We always said we'd get married. Then he doubled his income and suddenly wants to wait a little. When I out-earned him early on, I never once hesitated
I stepped on something in the yard three days ago and now there's a red streak going up my calf. It's not throbbing, just tender, and I keep telling myself it'll fade by tomorrow. Should I get this looked at before I leave for a work trip?
More on Delphi
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Top perspectives
Top perspectivesWriter of Lenny's Newsletter · Host of Lenny's Podcast · ex-Airbnb
“The honest answer: if you're not sure, you probably don't have it yet. When you truly have product-market fit, people are fighting to get in. You're not questioning it.”
Co-founder of Sundial · ex-VP Design at Facebook
“The clearest signal is retention: are the people who try your product coming back without you having to push them? If they are, you likely have product-market fit for a segment. If they aren't, the rest is noise.”
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Their Delphi, answering in their voice
I'm a solo founder and I honestly can't tell if I have product-market fit yet.
If you're not sure, you probably don't have it yet. When you do, people are fighting to get in. Start with the Sean Ellis “very disappointed” survey and look hard at retention. Those two give you the clearest read.
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