r/leanstartup

I've seen it a countless number of times. A founder gets a flash of inspiration, maybe even sketches out an idea a bit, and then jumps straight to trying to hire a dev team or learns to code. The problem? They haven't actually tested if anyone understands the idea, let alone wants to use it.

It's not about building the 'perfect' app first. It's about building the smallest, simplest version that shows someone EXACTLY what your idea does. A clickable demo. Something people can interact with and provide real, honest feedback on. A prototype isn't the finish line. It's the first honest test.

Think about it. Before you build the full thing, make sure people understand the first version. Your idea should be seen before it's overbuilt. Start with proof, not a giant invoice. What are your thoughts, Reddit? Has anyone here been burned by building too much too soon?

I keep seeing founders (myself included) jump from “interesting idea” straight into building without a real quantitative stress test.

Curious how people here are actually validating ideas with numbers before writing code or signing leases.

Specifically:

• Do you build basic financial models (even rough ones) before committing, or do you rely mostly on qualitative signals like interviews and waitlists?
• How deep do you go on unit economics (LTV, CAC, payback, margins) at the idea stage, and what’s “good enough” for you to move forward?
• Has anyone here used structured benchmarks (industry data, city-level cost multipliers, etc.) to validate assumptions, or is it mostly your own research and gut?
• What’s your process for spotting “this idea will die because of simple math” before you spend 6–12 months building it?

I’m interested in approaches that combine:

• Market research and customer discovery
• Simple but realistic financial modeling
• Some kind of “stress test” or scenario analysis (best case / base case / worst case)

Would love to hear concrete workflows, frameworks, or examples from your own companies—especially where the numbers changed your mind about moving forward (or not).

Not trying to promote anything—just trying to learn how other founders here are building a more rigorous validation step into their process.

It's common here in my country that most of people seem pretty lost. They don't know what their hobbies are, what their life meanings are, what their dream jobs are and they don't have any motivation to do anything.

I think this is a pain point that's worth solving, but what solution am I supposed to provide them with?Courses but what content I should offer? A personality test?

Do you guys have any suggestions where I should start with?

Does anyone else feel like building the product was actually the easy part… and marketing it is the real challenge?

I’ve been noticing this a lot with technical founders lately.

We can spend months:

- building features

- fixing bugs

- improving performance

- shipping updates

But the moment it comes to:

- explaining the product clearly

- getting attention

- creating content

- building a brand

- SEO

- social media

- distribution

everything suddenly feels 10x harder.

You finally launch something you genuinely believe is useful… and people still say:

“Looks interesting, but I’m not sure what it does.”

That feeling is honestly frustrating.

I’m starting to think a lot of startups don’t fail because the product is bad.

They fail because nobody notices them.

For founders here:

What’s been harder for you personally —

building the product, or getting people to care about it?

And what part of marketing do you struggle with the most?