Founder Playbook · Starter Story
10 tactics from Dennis
I rebuilt a $1B app and now make $14K/month
Watch the full episode“I got the first sales minutes after my first Reddit post i've never seen anything like that before and that was a clear sign that my idea was validated”
Use Immediate Sales as the Only Validation Signal That Matters
Dennis posted screenshots of his app on Reddit and got blocked almost immediately, but not before the first paying customers came in. The speed of payment was the signal he needed. He contrasted this with previous projects that had no users at all.
“your MVP doesn't have to be perfect try to nail design and usability make sure that your core feature works well in the case of Yodafone that was plainly making an outbound call from the app”
Ship a Working Core Feature First and Ignore Everything Else
Dennis built his entire MVP over a single weekend, guided by one constraint: the core feature had to work. He used Cursor and Next.js and accepted that everything else could be imperfect at launch. The result was a product people paid for the same day he posted it.
“my story was of a lone engineer that was standing up to take the place of a giant company”
Craft a Compelling Underdog Narrative for Your Reddit Launch Post
Dennis knew Reddit users scroll fast and ignore anything uninteresting. He framed his launch around the David-vs-Goliath angle — one developer filling the gap left by Microsoft — which gave readers a reason to care before they even looked at the product. A compelling underdog story is what made his Reddit posts shareable and drove the virality tied to the Skype shutdown news cycle.
“I wrote to the subreddits for travelers because I thought that this is my main core audience”
Target Reddit Communities of Displaced Users When a Platform Shuts Down
Dennis launched primarily on Reddit, targeting subreddit communities he identified as his core audience. Even after getting blocked quickly, the post had enough exposure to generate sales within minutes. The immediate validation showed that targeting the right existing audience — people actively losing Skype — was more important than having any social media following.
“I looked for the keywords that I wanted to rank on like for example Skype alternative then I found the blog posts that were ranking there and tried to find the authors of those blog posts”
Reach Out to Blog Post Authors to Replace Dead Competitor Mentions
When Skype shut down, articles ranking for 'Skype alternative' suddenly had a dead link to replace. Dennis found the authors on X, LinkedIn, or email and asked to be added or swapped in. This got Yaphone listed on high-authority sites it could never have earned organically.
“yeton is a pay as you go international calling service and that really differs us from most of the other competitors out there because the others operate on a SAS model that means that if you are an individual customer you need to uh buy subscription that usually costs uh $30 a month or more”
Use Pay-as-You-Go Credits to Undercut Subscription-Only Competitors
Dennis identified that competitors locked customers into monthly subscriptions costing $30 or more, which created friction for casual or infrequent callers. Yaphone let individuals simply buy credits and top up as needed, removing the commitment barrier entirely. This structural pricing difference was a core differentiator from day one.
“I created my enterprise plan totally by accident a guy texted me in the middle of the night asking if Yafon has a enterprise plan for his organization i said "Of Course we do." And to tell you secret we didn't i coded my enterprise plan in a panic mode through the night because the next morning I had to live life demo it in front of this customer”
Build Enterprise Plans Reactively When the First Inbound Customer Asks
Dennis had assumed Yaphone would be a pure B2C product for travelers and expats. A late-night message from a business customer forced him to ship an enterprise tier overnight, and that customer has since stayed on, paying roughly $1,000 per month. The lesson is that enterprise features don't need to be planned ahead — demand can reveal itself and be met on the spot.
“I used to text every single paying customer for 6 months asking for feedback i just add "Hey I'm Dennis the founder of Yadafone i would be thrilled to know what you think about the app and how your experience was so far."”
Text Every Paying Customer Personally for Six Months to Catch Problems
Dennis sent personal messages to every paying customer over his first six months, using the responses to understand which user segments were being served best and to surface complaints before they turned into public bad reviews. He acknowledges the approach is time-consuming and draining, but credits it with shaping the product's direction and keeping churn low.
“I think the key thing about this idea is that it's not an idea at all it's a validated market which was first validated with the tweet by Peter levels I saw and then by sales I got from my Reddit post”
Build for Proven Demand by Targeting a Shutting-Down Giant's Market
Dennis explains why Yaphone succeeded where his previous projects failed. The market for international calling was proven by Skype's decades of users, and the shutdown created immediate, urgent demand. He saw idea validation twice — first from Peter Levels' tweet, then from first-minute sales on Reddit.
“I knew how Reddit works and the thing about Reddit is that you can get millions of impressions without having any followers at all i launched products on it before I got blocked a lot but I knew how to write stuff up which subs to target which tone of voice to use”
Use Reddit to Get Millions of Impressions With Zero Social Media Followers
Dennis had only 60 Twitter followers when he launched, so he leaned entirely on Reddit. He got blocked from traveler subreddits quickly but had already captured his first paying customers. He then shifted to entrepreneur subreddits, which explicitly allow project promotion, and picked up 150 users in his first week.