Senior Devs and the Deception Known as The Mom Test

Last month, I sat in on a pitch by a Senior Dev friend with 10 years of experience for his project using Claude Sonnet 4.6. He showed his screen to a user and asked exactly one question: “Do you think this automated reporting feature is cool?”

The answer, of course, was yes. And that project died just two weeks after launch because no one was willing to pay.

What is The Mom Test, Really?

Rob Fitzpatrick’s book The Mom Test teaches you how to talk to customers so they can’t lie to you—even if that person is your mom. The core principle is simple: don’t talk about your idea; talk about their life.

The problem is that this book was written for business people. When it falls into the hands of techies, big holes appear. We are people who prefer solutions over problems. Forcing a Senior Dev to hide the solution they take pride in is pure torture.

The Coder’s Mindset Flaw

Technology Obsession

Devs are often obsessed with their tech stack. With tools like Gemini 3.1 Pro or Cursor, you can finish an MVP in just a few evenings. This speed inadvertently makes us lazy in the research phase. We’d rather code something and throw it at the user than sit down and ask them questions first.

I used to think that bringing a smooth-running demo to users was the smartest way to gather feedback. But after burning through every weekend for three months building a data management SaaS, it turned out that compliments like “the tool runs fast” were just polite lies. None of them were ready to pull out their credit cards and pay.

The Trap of False Productivity

Just last Wednesday, while reviewing project progress with a team using Llama 4 Maverick, I saw the same old scenario play out. They wrote thousands of lines of code and deluded themselves into thinking they were moving fast.

They claimed they had validated the idea according to “Mom Test standards.” But when I checked the interview logs, they had only interviewed their fellow IT friends. This is why I once warned about Slow Productivity for Solo Devs: Don’t Be Blind. Running fast means nothing if you’re running in the wrong direction.

When The Mom Test Backfires

Users Don’t Know What They Want in Deep Tech

The Mom Test advises you to ask about the past. For example: “When was the last time you struggled with this pile of data?” This question is perfect for traditional software.

But with current generative AI products like GPT-5, users don’t even know where the technological limits lie. Asking about the past doesn’t help you shape the product’s future. It’s similar to the misuse of Tool calling in AI agents: A practical analysis—users have no idea they need an agent capable of calling third-party APIs until you show them how it works.

Dev-Style vs. Mom Test-Style Interviews

Here is the difference between how an average dev asks questions and how you should do it.

Criteria	Dev-Style Interview	Mom Test-Style Interview	Notes
Opening	”I’m building this AI app…"	"How has your work been lately?”	Hide your idea.
Validation	”Would you use feature X?"	"How are you currently solving problem X?”	Look for actual behavior.
Closing	”This app costs $10, will you buy it?"	"How much are you paying for your current tool?”	Measure the pain in dollars.

How to Fix Interview Errors for Devs

If you are a dev and still want to use this framework, follow these steps:

1. Turn off the computer. Don’t bring a laptop or any device that can show code or a demo. Just bring a pen and paper.
2. Seek rejection. Your goal isn’t to convince them to use the product, but to find out why they WON’T use it.
3. Make them commit. If they say a problem is frustrating, ask if they have ever tried buying a solution. If not, it’s not a big problem.
4. Forget the tech stack. Customers don’t care if you use Windsurf or manually type every line of code. They only care if their problem disappears.

FAQ

Should I skip The Mom Test if I’m building an AI product?

Not entirely. You still need The Mom Test to find the pain points. But once you find them, you need to combine it with showing a demo quickly so users understand what AI can do for them.

Code first or ask first?

Asking first is always cheaper. No matter how fast Cursor helps you code, the time spent deploying, fixing bugs, and maintaining is a real cost. Don’t write code until someone promises to pay for it.

How do I know if a user is lying?

When they use future-tense words like “I will,” “Probably,” or “Maybe.” The truth always lies in the past tense. Force them to talk about what they did, not what they plan to do.

Conclusion

The Mom Test is a great book, but it is somewhat over-hyped in the tech world. For a Senior Dev, the hardest skill isn’t learning to code in a new language; it’s learning to stay silent about the code you just wrote. Ultimately, the best product isn’t the one with the most perfect architecture, but the one that solves the right thorn in the user’s side.