Before you help many,
you have to help one.
— Daniel Ahmadizadeh
I've been teaching this framework to founders at Stanford and Columbia for years. I call it Start With One.
The idea is simple: before you worry about markets, TAM slides, and growth strategies — can you name one specific person whose life is genuinely better because your business exists?
Not a segment. Not a persona. A name.
Most founders I meet can't answer that question. Not because their business isn't working. Because the modern startup playbook makes it easy to hide in abstraction.
Start With One is a way back to reality.
WHY THIS MATTERS FOR YOUR BUSINESS
Building software is becoming a commodity. Relationships aren't.
Here's what I've noticed about the founders I work with most — the ones running scheduling software for fire departments, campground management platforms, youth sports registration tools.
They all started the same way.
One customer. A real person with a name. Someone who had a specific problem and trusted them enough to try.
That first customer told a colleague. Who told another. Who trained their whole team. Who built their entire operation around the product. Who would be genuinely disrupted if it disappeared tomorrow.
That's not a software moat.
That's a relationship moat.
And here's the thing nobody is saying loudly enough: that moat gets stronger as AI makes software cheaper to build — not weaker.
Anyone can build a scheduling tool in a weekend now. Nobody can replicate 20 years of trust with a fire department in La Grange, Kentucky. Nobody can copy the fact that your customers call you directly. That they stayed not because switching was hard but because they genuinely didn't want to leave.
You've been living the Start With One framework your whole career. You just didn't have a name for it.
THE START WITH ONE LOOP
Seven steps. One loop.
Repeat until it's a business.
This is how every great vertical software company was actually built — whether the founder knew it or not.
Start with who
Name one real person you can reach this week. Not a market. Not a persona. A name. If you can't name them, you're still in theory.
Find the hair-on-fire moment
Identify the specific moment their problem is loudest. The moment they'd grab a brick — an imperfect solution — just to make it stop. That urgency is everything.
Talk like a scientist
Ask about their life, not your idea. Ask about what already happened, not what they might do someday. The goal is truth, not compliments.
Look for real commitment
Not praise. Commitment. Time, money, or reputation. If they won't give you one of those, they're not the one. Move on.
Build the smallest brick
Ship the smallest thing that helps a little and teaches you a lot. Not the final product. The first real thing. You learn nothing until something is in front of a real person.
Enter their environment
Go where the problem lives. Sit in their office. Shadow their day. Join the communities where they talk. One hour in the real world beats months of guessing.
Turn learning into action
Every week is an experiment. Hypothesis. Test. Conclusion. Move on. The founders who move fastest aren't smarter — they just run the loop more often.
Repeat. Evidence compounds. Confidence follows.
THEIR ONE
Every business on this list started with a single person who trusted them.
These are the customers who made these businesses real. Not the hundredth customer. The first one.
Rich C.
EMS Coordinator · La Grange, KY
eSchedule customer since 2009
"I trained every person who works here on this system. It's just part of how we run."
Mike K.
Campground Owner · British Columbia
Let's Camp customer since 2017
"I called them when we had three sites. Now we have forty-one. They grew with us."
Tony R.
Youth Soccer Director · Ontario
PowerUp customer since 2019
"Every kid in this league has been registered through this platform. That's not something you just switch."
Illustrative composites representing real customer tenure patterns from Pre. portfolio companies.
WHY I KNOW THIS
I learned this the hard way.
Nine years ago I was in your position.
We were the hot shots of our YC batch. Grew from $5K to $85K MRR in 12 weeks. Everyone wanted to write us checks. Four companies in our batch are now in YC's all-time top ten.
Then I shut it down and returned cash to investors.
Not because the business was bad. Because I thought billion or bust were the only two options. Because I stopped paying attention to the one person who actually needed us — and started chasing a market that didn't exist.
I had a Barry. A real estate team leader who was spending $10,000 a month on leads that nobody was following up on. Barry had a hair-on-fire problem. Barry would have stayed forever.
I focused on the 13% of real estate agents who were full-time professionals instead of the Barry who was already giving me money every month.
I forgot Start With One.
I built Pre. so that founders with a Barry — with a Rich and a Mike and a Tony — would have someone in their corner before they made the same mistake I did.
Daniel Ahmadizadeh
Founder, Pre. · 2x YC founder
HOW PRE. USES THIS
When we embed in your business, the first thing we do is find your Ones.
Not your best customers by revenue. Your most embedded customers. The ones who would be most disrupted if you disappeared.
We talk to them. We understand what job they're hiring your software to do. We find out what they love, what they tolerate, and what they wish you'd build next.
Then we build it.
This is how you grow a vertical software business without abandoning what made it work in the first place. You don't need more features. You need to go deeper with the people who already trust you.
That's the whole playbook.
Week 1
Talk to your 10 most embedded customers
Week 2–8
Build what they actually need next
Day 90
You decide from strength
THE FRAMEWORK IN FULL
Start With One is a book, a course, and a way of building.
I teach this methodology at Stanford and Columbia. I've run it with founders from Mumbai to Minneapolis. The framework is free. The book is in progress. If you want to go deeper:
THE FRAMEWORK
The 7-step loop
The complete Start With One methodology — free to use, share, and teach. Used in classrooms at Stanford, Columbia, and accelerators around the world.
Download the framework →APPLY THIS
Work with Pre.
If you're running a vertical software business and you want someone to help you go deeper with your Ones — that's exactly what Pre. does.
Talk to Pre. →Your first customer is still your most important one.
Not because of their revenue.
Because of what they taught you. Because of the trust they extended before you had anything to prove. Because of the 309 others who came after them because that first person said yes.
Start with one.
Then see how far it takes you.
— Daniel Ahmadizadeh, Start With One
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