Brainwaves by Burak Büyükdemir
Field notes from 26 years of investing in early-stage startups.
March 13, 2026
I Spent 54 Minutes to Learn 71 Years of Business Knowledge!
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About the Guest
Steve Blank is a serial entrepreneur (8 startups), educator at Stanford, and the creator of Customer Development - the foundation behind Lean Startup thinking. He helped bring "get out of the building" into startup vocabulary and has worked on programs like Hacking for Defense and the NSF I-Corps methodology.
A while back, I hosted Steve Blank on my podcast.
He's one of those people who quietly rewired how startups are built.
And what I like about Steve is this: he doesn't romanticize entrepreneurship.
He describes it as it is - messy, uncertain, and mostly a search problem.
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1. Startups don't execute. They search.
This is the cleanest distinction I've heard:
Big companies execute known business models. Startups search for one.
Most early-stage mistakes come from acting like you're already a company.
You're not.
You're still figuring out: Who is the customer? What do they really want? What's the pricing? What's the channel? What even is the business model?
If you treat "search" like "execution," you burn time and money.
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2. "No facts inside the building."
Steve said it again in his own way:
You can't discover truth by debating it internally.
The only way is: talk to customers, test assumptions, learn fast, repeat.
A startup is not a plan. It's a learning machine.
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3. Profound beliefs, loosely held.
This line is worth writing on your wall.
You need conviction to survive the hard days.
But you need flexibility to accept evidence.
So yes: be passionate. But hold it loosely enough to pivot when reality disagrees.
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4. Your first day is just hypotheses.
Steve reminded me of something founders forget:
On day one, you're guessing.
Everything is a hypothesis:
- the problem
- the user
- the willingness to pay
- the distribution channel
- the sales cycle
Your job is to collect evidence - not opinions.
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5. Founder life needs humor (or you'll take damage).
One part I enjoyed: Steve talked about why he uses humor.
Because startup life is emotional whiplash.
One day things feel amazing. Next day something breaks.
If you don't learn to bounce back, you'll take it personally. And that's how founders burn out.
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My takeaway for founders
If you're early stage, don't act like a company.
Act like a search team.
Get out of the building. Turn your assumptions into tests. Collect evidence. Pivot when needed. Keep going.
If you want the full conversation with Steve, here's the episode:
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Until next time,
Burak
Founder & Solo GP, Startupist Ventures Fund
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Burak Büyükdemir
Founder & Solo GP, Startupist Ventures Fund · Startup Istanbul
Founder of Etohum & Startup Istanbul. Solo GP at Startupist Ventures. 26+ years building startup ecosystems across 170 countries.
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