The Founder's Research Stack: Find Customers on Reddit, Validate Ideas with 1M+ Real Complaints
Every founder has two research jobs: figure out what to build and figure out who to sell to. Here's how to do both with real data instead of guesswork.
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The two-sided research problem
Most founders fail at research in one of two ways. They build something nobody wants (skipped validation), or they build something people want but can't find anyone to sell it to (skipped customer discovery). These are two different jobs, and you need both.
The good news: the same place people complain about their problems is also where they go looking for solutions. As one founder put it on r/microsaas, "Reddit is the largest focus group and nobody's using it properly." The trick is using the right lens for each job.
Side 1: Validate what to build (with complaint data)
Validation means confirming a problem is real, frequent, severe, and underserved, before you build. The most reliable signal is what people already complain about at scale. Analyzing 1M+ complaints across Reddit, G2, Capterra, and the app stores surfaces patterns no single thread can: which problems recur across thousands of users, and which existing tools consistently let people down.
A concrete example: when you rank documented problems by validated demand, reporting and analytics gaps sit near the very top: recurring complaints about inflexible, manual, and limited reporting in everything from accounting software to HR platforms. That is exactly the kind of frequent-and-underserved signal worth building on. As one r/microsaas post bluntly framed it, "every complaint is someone saying 'I would pay for this to not suck.'"
This is the job BigIdeasDB is built for: turning a million scattered complaints into ranked, validated problems. For a Reddit-specific walkthrough, see our guides on validating a SaaS idea on Reddit and finding SaaS ideas from Reddit complaints.
Side 2: Find who to sell to (on Reddit)
Once you know the problem is real, you need the people who have it right now and actively looking. Reddit is unusually good for this because buyers describe their situation in their own words: their current tool, what broke, their budget, and what they wish existed. That makes buying intent legible in a way cold lists never are.
This is the job Linkeddit is built for: monitoring subreddits for buying signals and surfacing the high-intent conversations worth replying to. Dig deeper in our guides on market research on Reddit and turning that research into a content strategy backed by Reddit data.
The combined stack: a 4-step workflow
- Find the problem. Use complaint data to confirm a painful, recurring, underserved problem, not a hunch.
- Validate the demand. Check that the problem shows up across multiple sources and that people are already trying (and failing) to solve it with existing tools.
- Find the buyers. Locate the subreddits and threads where people raise that exact problem right now.
- Show up with the answer. Reply where it's genuinely helpful: reply early, in low-noise threads, instead of blasting cold outreach.
Validate, then acquire. One half tells you the idea is worth building; the other half hands you your first customers.
Find your buyers on Reddit
Once you know what to build, Linkeddit finds the people already asking for it.
Frequently asked questions
What is a founder research stack?
It's the pair of research jobs every founder has to do: (1) validate what to build, meaning confirm a real, painful problem people will pay to solve, and (2) find who to sell to, meaning locate the specific people experiencing that problem right now. Most tools only do one side; doing both in sequence is what de-risks a launch.
How do you validate a SaaS idea with real data?
Instead of guessing, look at what people already complain about at scale. BigIdeasDB analyzes 1M+ complaints across Reddit, G2, Capterra, and the app stores, so you can see which problems are frequent, severe, and underserved before writing a line of code.
How is finding customers different from validating an idea?
Validation tells you a problem is real and worth solving. Customer discovery tells you exactly where the people with that problem are talking right now, like the subreddits where they ask for solutions. Linkeddit surfaces those high-intent conversations so you can reach buyers directly.
Why use Reddit for both research jobs?
Reddit is one of the largest unfiltered focus groups on the internet: people describe their problems, their current tools, and what they wish existed, in their own words. That makes it valuable both for validating demand and for finding buyers actively looking for a solution.
What's the fastest way to start?
Start with the problem, not the product. Use BigIdeasDB to confirm a painful, recurring problem with real complaint data, then use Linkeddit to find and reach the people raising it on Reddit. Validate, then acquire.