Hi. I'm Hagen.
Serial technical founder.
I turn ideas into companies — from zero to product-market fit to team to exit. I've done it four times. Today I'm building nestfainder.ai and selectively working with founders who need a technical co-founder or CTO-level partner.
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.
I help founders ship faster, avoid costly architectural mistakes, and build teams that scale. This includes hands-on interim CTO roles, technical co-founding, and due diligence for investors and acquirers — assessing codebases, architecture, and engineering teams across crypto, healthtech, and VC-backed startups. If you're building something ambitious and need a senior technical partner, I want to hear from you.
nestfainder.ai
Location intelligence platform · Jan 2026 – present
Decoding global urban data to help people find where they truly belong.
Leveraging AI and advanced semantic analysis to score 22,000+ cities worldwide across quality of life, safety, healthcare, and political stability. More than just a search engine—it's a data-driven framework for modern mobility.
Solo-build, launched January 2026.
Let's build something together.
I'm actively looking for the right co-founding opportunity, interim CTO engagement, or advisory role. If you're working on a hard problem and need someone who has been there before — from zero to exit — reach out.
Thoughts from LinkedIn and Medium.
View all →
The “Conmtinue” Mystery: How AI Knows What You Mean When You Can’t Spell
We’ve all been there. You are deep in a flow state, chatting with an AI like Claude or ChatGPT. You are typing furiously, trying to get a…
Claude Code Team Agents + Team Lead sind der absolute Hammer! Ich nutze die Team-Agents in der Claude Code Beta jetzt seit einem Monat intensiv für nestfainder.ai und ich denke, dass ist aktuell… | Hagen Hübel | 12 Kommentare
Global mobility is not just a trend; it is the future. Driven by economic shifts, climate change, and political landscapes, more people than ever are looking for a new place to call home. Being deeply rooted in the expat community myself, I have seen firsthand that finding that place isn
Ask an LLM about your relationship. It'll say break up. It's not wrong. Reddit's relationship advice in one stat: nearly 50% of all recommendations are just "leave." u/GeorgeDaGreat123 analyzed 15… | Hagen Hübel | 19 comments