Hi. I'm Hagen.
Serial technical founder.
I turn ideas into companies — solo start, first customers, product-market fit, team. Then I do it again. Between ventures I work with founders as a technical partner or advisor.
Zizzle eLearning Inc.
USA
A mobile app for learning Chinese, backed by BOOM Startup. Built the product from scratch and led the technical team.
Undisclosed (Exit)
Switzerland
Built a micropayment product on e-money infrastructure. Closed the first major enterprise client, hit €1M ARR in year one, then exited.
TokenForge
Germany
Started alone, found the first customers, reached PMF. Added two co-founders, built the team, brought in investors. Sold my shares in 2023.
Between ventures I work with founders, investors, and established companies as a technical advisor. This includes technical due diligence for investors and acquirers — assessing codebases, architecture, and engineering teams of companies ranging from a German crypto exchange to large healthtech companies and VC-backed startups.
nestfainder.ai
Location intelligence platform · Jan 2026 – present
AI-powered platform helping people find their ideal city to live in — 22,000+ cities worldwide, scored across quality of life, safety, healthcare, and political stability. Solo start, January 2026.
Have an idea worth building?
I'm open to co-founding, consulting, and advisory roles — for early-stage ventures and established companies alike. If you feel like nestfainder.ai is something you want to be part of in any shape or form, I'd love to hear from you.