Hamburg, Germany · SPORTFIVE · Building with AI since 2023

I build AI systems
that run real businesses.

From brand partnerships to automated pipelines — I create the tools that don't exist yet.

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brand partnerships processed

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automated submissions

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reduction in manual work

See the work ↓

Background

From After Effects to
automated pipelines.

I started in motion graphics. After Effects was my tool — I made things move, told visual stories, built branded content for sports properties. Then I moved into brand partnerships at SPORTFIVE, managing activations for companies like Coca-Cola, Pringles, Hisense, and Uber Eats across major gaming rightsholders and the Esports World Cup.

The work was exciting but the process wasn't. Every partnership required hours of manual labor: pricing calculations across 50+ markets, Photoshop editing, After Effects rendering, presentation building. I saw what AI could do and decided to close the gap myself.

I built FIVESTACK — a platform that now processes millions in partnership revenue for a major gaming rightsholder. Then I kept going: voice agents, partnership simulators, lead generation tools, automation infrastructure. Now I'm building with the Claude Agent SDK, exploring what happens when AI systems can reason, plan, and act autonomously.

I'm not an engineer. I'm someone who sees problems, understands what AI can do, and builds the solution. The gap between idea and implementation is shrinking — and I've been living in that gap for the past two years.

AI AutomationMotion Graphics & After EffectsCross-functional Project ManagementProduct DevelopmentSports & Esports MarketingAI AutomationMotion Graphics & After EffectsCross-functional Project ManagementProduct DevelopmentSports & Esports MarketingAI AutomationMotion Graphics & After EffectsCross-functional Project ManagementProduct DevelopmentSports & Esports Marketing
Brand Partnership ManagementSponsorship Strategy & ActivationBusiness DevelopmentStakeholder ManagementProposal & Pitch DevelopmentBrand Partnership ManagementSponsorship Strategy & ActivationBusiness DevelopmentStakeholder ManagementProposal & Pitch DevelopmentBrand Partnership ManagementSponsorship Strategy & ActivationBusiness DevelopmentStakeholder ManagementProposal & Pitch Development

Approach

I don't start with the technology.
I start with the bottleneck.

Every tool I've built began as a frustration — something that took too long, cost too much, or didn't scale. AI didn't make me a developer. It made me someone who could close the gap between seeing a problem and solving it.

Get in touch

Let's talk.

Currently exploring opportunities at the intersection of AI and product strategy. If you're building something that matters, I'd love to hear about it.

Leon Hartmann · Hamburg, Germany

Built with Next.js, Tailwind, and a lot of Claude.