I talk to a lot of engineers who want to build something on the side. And I’ve noticed a pattern.
Ninety percent of them are waiting for something that doesn’t exist. They’re waiting for the perfect idea, or the perfect time, or the perfect market. They’re building in secret, hoping that someday, somehow, the customer shows up.
The other ten percent? They’re asking a different question first: How do I actually know this is real?
That’s the question that matters. And it has a simple answer.
The Line: $500/Month
Before you quit your job. Before you build anything. Before you make any big decision about your future—prove it at small scale.
Can you make $500 a month from a real customer paying real money?
If yes, you have a business. If no, you have a draft. And you need to know which one you’re holding.
I call this the $500 test.
It’s not about the money. It’s about the proof. When someone outside your company pays you $500 for your work, you’ve proved something fundamental: Other people will pay for what you can do. That’s not luck. That’s skill. And once you know you have it, everything changes.
Why $500 and Not Some Other Number?
Let me be clear about why I picked this number.
It’s low enough to be possible without quitting your job. You don’t need venture capital. You don’t need a miracle. You need one customer to value your time enough to pay for it. That happens every week to regular engineers doing normal work.
It’s high enough to mean something. This isn’t about selling a $19 course to your mom or making money on the side as a hobby. $500 is real money. It’s material. It changes the conversation you have with yourself about what you’re capable of. It gets serious.
It’s a monthly number. I mean $500 recurring, or reliably repeatable month over month. Can you find one customer and solve a problem for them that’s worth $500 a month? Or can you find multiple customers and land $500 across a month? Either way, you’ve proved you can generate revenue from actual customers.
Once you’ve done it once, you know you can do it again. That’s when the entire game shifts.
The Backwards Way Engineers Build (And Why It Fails)
Here’s what I see happen over and over.
An engineer decides they want to do something on the side. So they go off and they build something. A tool. A template. A framework. A course. They spend weeks perfecting it. Making sure it solves a problem. Getting it exactly right.
Then they finish. And they come back and ask: “So… who do I sell this to?”
That’s backwards.
Think about your day job. When you’re hired to design something, do they let you just go build whatever you think is cool and hope it solves the client’s problem? No. You get a spec first. You understand the requirements. You know what the customer actually needs. Then you design.
But that’s not how most engineers approach their side work. They design first and hope the customer shows up.
The right sequence looks like this:
One: Find a customer. Someone you know. Someone with a real problem in their actual workflow. Not hypothetical. Actual. This is step one.
Two: Understand their problem deeply. What are they doing right now? Why is it costing them time or money? What would it be worth to fix? You’re not guessing. You’re diagnosing.
Three: Quote them. Tell them what it would cost to solve it. Real price. Market rate.
Four: If they say yes, you do the work. If they say no, you move on to the next person.
Most side projects die because people skip step one. They jump straight to building. They spend weeks perfecting something nobody asked for.
The $500 test forces you to get the order right. Customer first. Everything else follows.
What Actually Counts as a Real Customer
I need to be clear about this because I see people cheat on this test all the time.
A real customer is someone outside your company. Not your boss. Not your current employer. Someone else. A former colleague. Someone from another industry. A friend who runs their own business. Someone external.
And they have to actually pay. Not a discount. Not a test run. Not a favor. They pay. Full price. On time.
Why does payment matter? Because when money moves, you know it’s real. When someone is writing a check, they care. They’re not doing you a favor anymore. They’re buying something.
I see people all the time who say they have customers. But when you dig in, it’s their friend who said yes as a favor. Or their cousin who got a deal. Or a company where their buddy works and is “testing” their service for free.
That’s not the $500 test. That’s practice.
The $500 test is: A stranger or former colleague calls with a problem. You quote them market rate. They pay it. You deliver. That’s proof.
Here’s why this matters: Once you’ve done it once, you know you’re not broken. You know the barrier isn’t “Can I do this?” The barrier is “Have I found the right customer yet?” That’s a finding problem, not a skill problem. And finding problems are solvable.
What Passing Actually Looks Like
Let me walk you through a real example so you see what this actually means.
You’re an engineer. You’re good at your job. You’ve been at it five or six years. You know your field.
A former colleague reaches out. Someone you worked with years ago. They’ve moved on to a different company. And they’re dealing with a problem you could solve.
Maybe it’s process design. Maybe it’s troubleshooting a system. Maybe it’s building a solution they don’t have the time or expertise to build in-house.
They ask if you can help. You tell them: “I can do this, and here’s what it’ll cost.” Maybe you quote $1500. Maybe $2000. It’s real money. Not a favor.
They think about it. They negotiate a little maybe. And you come to an agreement.
You do the work. It takes you maybe 20–30 hours over a month. You’re doing it outside your day job. Nights. Weekends. Or you take a few days of PTO.
You deliver. It works. It solves their problem.
They pay you.
Now you’ve made money outside your salary for the first time. And here’s the critical part: It wasn’t luck. You didn’t win a lottery. You used a skill you already have to solve a problem someone else had. They paid you for it.
That’s not a side hustle. That’s not a hobby. That’s proof you can do something people will pay for.
And once you’ve done it once, you can do it again. Maybe next time you quote higher. Maybe next time it’s easier because you’ve already done it. But the hard part—the part that stops most people—is behind you.
The Fear: Ethics and Your Job
I know what comes next. People ask me: “Isn’t this unethical? Won’t my employer care? Won’t I get in trouble?”
No. Here’s why.
If you’re doing work outside your job hours, for a customer outside your company, on your own time and dime, that’s fundamentally different from your job. It’s not your employer’s time. It’s not your employer’s customer. It’s not competing with your day job.
That’s not a gray area. That’s clear.
Now, does it depend on your contract? Yes. Some places have non-competes or restrictive covenants. So read your contract. Know what it says. But if you’re solving problems for a customer in a different industry or market, or you’re offering a service your current employer doesn’t offer, that’s usually fine.
But here’s the bigger point: Once you’ve made $500 outside your salary, your relationship with your employer changes.
You’re not dependent on them anymore. Not completely. You know you can make money another way. That changes your negotiating position. That changes how you think about your career.
And yeah, sometimes that means you have a conversation with your boss. Or you set clearer boundaries. Or you move on to something that gives you more time.
But you’re not trapped. That’s the whole point.
The $500 test isn’t just about money. It’s about proving you’re not locked in.
The Identity Shift
Here’s what I want you to understand about the $500 test.
It’s not about the amount of money. It’s about what the money proves.
There’s the person who works for a salary. That’s real. Nothing wrong with it. You trade your time for money. Stable. Knowable. Predictable.
And then there’s the person who can make money outside their salary. Who can find a customer, understand their problem, and get paid to solve it.
That’s a different person. Not better. Just different. That person has leverage. That person has options. That person is not trapped.
Most engineers never become that person because they never prove it. They think about it. They plan for it. They dream about it. But they never actually find a customer and get paid.
The $500 test is how you become that person.
You do it once. And everything shifts. Your confidence. Your relationship with your career. Your understanding of what you’re capable of.
You look at your job differently. You have a choice now. You’re not forced to accept anything. You’re not waiting for permission. You’re not dependent on one paycheck.
That’s what the test is really testing.
What You Do Next
The $500 test is simple.
Can you make $500 from a real customer who isn’t your employer?
Answer that question honestly. If the answer is no, here’s what’s blocking you:
You don’t know what problem to solve. You haven’t found a customer yet. You’re waiting for the idea to come to you instead of going looking for the problem.
Or: You found a problem but you’re afraid to quote. You know what needs to be done, but you’re not confident enough to name a price.
Or: You quoted but they said no. You pitched and they walked. That’s data. It’s not a failure. It’s information.
Or: You’re still building in secret. You’re waiting until it’s perfect. Until you’re ready. That day never comes. Stop building and start looking.
Here’s the action item:
This week, reach out to three people you know. Not to pitch. Just to listen. Ask them what’s eating up their time or costing them money in their work. Actually listen. Don’t try to solve it yet. Just listen.
One of them probably has a problem you can solve. That’s your first domino.
The Gate
The $500 test isn’t complicated. It’s a gate.
On one side: you’re thinking about it.
On the other side: you’re doing it.
The gate is simple. Can you make $500 from a real customer who isn’t your employer?
That’s the question. Answer it honestly. Then move forward from wherever you are.
If you haven’t passed the test yet, you know what to do. Find the problem. Quote the customer. Get paid.
If you have passed it, you know something most people don’t: You’re not trapped. You have options. Everything else is just scaling.
That’s the $500 test. That’s the line.
Want to go deeper?
Listen to the full episode of Company of One where we walk through real examples, address the specific fears holding you back, and break down the exact mechanics of how to land your first customer.
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