Jonas Bertelsen

I’m a growth-focused founder and advisor working at the intersection of brand, performance, and product. I help early-stage startups find traction — especially in the messy phase where data is scarce, customers are few, and everything depends on clear thinking and fast iteration. I started my first company at 20 and have spent the past decade in tech and startups — from building a viral media brand that reached nearly 9% of Denmark’s population to leading growth for high-ticket B2B and e-commerce brands. Through Fuelize, I work directly with company owners and founders to remove bottlenecks and replace them with systems built on rapid testing, automation, and repeatable frameworks. That approach has driven ROAS 50+ and built structured growth engines from scratch. Today, I advise a handful of founders each year on how to build early traction, test channels intelligently, and create brands that compound over time. My style is direct, analytical, and creative — grounded in first-principles thinking and execution that gets results.

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  Bootstrapping

  I’ve built brands and growth machines with minimal budgets and no outside funding. I focus on ROI-driven creativity — how to get leverage without money, build momentum early, and stay lean without stalling growth.

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  Branding

  I combine storytelling and strategy to help founders build brands that feel inevitable. Beyond visuals and tone, I focus on the emotional logic behind why people care — crafting identities that drive trust, loyalty, and growth.

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  Go to market strategy

  From idea to first paying customers, I help founders design launch strategies that make noise for the right reasons. We’ll define your core narrative, channels, and early acquisition tactics that fit your product and resources.

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  Growth marketing

  I build structured growth systems that turn creative chaos into predictable traction. From testing frameworks to automation and funnel optimization, I focus on what compounds over time — not hacks, but repeatable growth engines.

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  Product market fit

  I help founders identify what actually resonates with their first users when data is scarce and intuition drives decisions. My process combines fast testing, clear positioning, and honest feedback loops — the goal isn’t perfect numbers, it’s signal.