DenberTech

Dennis Ramírez Bernal's journey to DenberTech started with a massive win. In December 2021, while working as a product marketing specialist at Escribà, one of Spain's most prominent pastry shops, he created the "Crypto Tortell" campaign—the first Christmas cake purchasable with Bitcoin. The campaign exploded, reaching over 2 million people and earning Dennis TV, newspaper, and radio interviews. The success was intoxicating, and the timing seemed perfect. By January 2022, just weeks after the campaign, multiple companies were approaching him asking how to accept cryptocurrency payments in their own businesses.

The lightbulb moment came quickly: build a startup to help businesses accept crypto payments. At the time, crypto was hot, businesses wanted in, and Dennis had just proven he could make crypto cool. What could possibly go wrong?

Dennis started solo but soon brought in friends to handle development. The good news: since his friends worked for free, the MVP cost "essentially free"—he had access to up to $5,000 from his own savings and other projects, but barely needed it for development. The approach was deliberately lean: build simple software that was easier to use than existing exchange solutions, ship fast, and iterate with real customers.

They followed Y Combinator's "Things that don't scale" philosophy, planning to use early revenue and customer feedback to refine the product. Dennis maintained constant communication with potential customers during development, treating market research as an ongoing conversation rather than a one-time exercise. However, the reality was messier than the plan: the software was never fully finished. They only managed an MVP attempt.

Initially, customer acquisition was easy. The viral Crypto Tortell campaign had generated a flood of inbound leads, so Dennis didn't need to do much outreach at first. But as the initial wave plateaued, he tested other channels: cold calling and paid media (Facebook Ads, Instagram Ads, Google Ads). His budget per campaign ranged from $250–$500, with some experiments featuring dynamic video content and others focusing on text and images. He also invested in Google Ads targeting informational and commercial keywords.

The channels worked at generating interest—but at a brutal cost. CAC (customer acquisition cost) was extremely high across paid channels, making it impossible to sustain campaigns profitably. An inbound marketing strategy via SEO and content was planned but never executed.

What worked: the viral marketing foundation and strong initial inbound interest. What didn't: monetization. When Dennis tried to charge for the service, the fatal flaw emerged. Potential customers appreciated the concept, but they didn't have an urgent, meaningful problem that needed solving. They were interested in crypto payments because of the hype and publicity potential—not because they genuinely needed the solution.

The startup generated zero revenue despite ongoing expenses. Approximately 90% of the ~$5,000 budget went to customer acquisition; the remaining 10% went to management software and MVP development. Dennis realized too late: "We are trying to create a solution to a non-existent problem."

DenberTech eventually shut down. Dennis identified three core failures: being overly optimistic about projections, not being adequately prepared as a team (particularly lacking engineering expertise), and—most critically—solving a problem that didn't actually exist. He learned that interest and hype are not the same as demand, and that every problem isn't a business opportunity. His key takeaway: identify a genuine problem first, then find its solution. Don't invent a solution and hunt for problems to match it.

Today, Dennis works as a growth specialist and has become an advocate for pre-validating startup ideas through pre-sales rather than chasing trends. He now recommends organic channels over paid ads and emphasizes joining an incubator to strengthen the team. The $5,000 loss taught him more than many successful exits teach others.