Six startups. Two exits. €1M ARR in year one once. I'm a serial technical founder who starts alone, finds the first customers, reaches PMF, builds the team, and sells. If you're a founder who needs a technical co-founder — or a company that needs an interim CTO — read on.
Decoding global urban data to help people find where they truly belong. 22,000+ cities scored across quality of life, safety, healthcare, and political stability — with LLM narratives explaining the "why".
AI-driven news aggregator that cuts global news down to the facts — customizable feeds in any language across tech, finance, and politics, built on RAG over a deliberately diverse spread of sources.
Tokenization-as-a-service for institutional clients. Solo-build → PMF → two co-founders → investors. Sold my shares in 2023 to focus on what's next.
Micropayment product on e-money infrastructure. Closed the first major enterprise client, hit €1M ARR in year one, then exited.
Blockchain-secured platform for the new-media art market — distribution, authentication, and trading of digital artworks, with high-end pieces co-owned via YAIR security tokens.
Mobile app for learning Chinese, backed by BOOM Startup. Shipped one of the first production React Native apps as CTO from Salt Lake City.
Venture studio, consulting & funding · Berlin. Where the prototypes get built, clients get consulted, and the first checks get written.
itinance.com ↗Incubator & builder. The company builder behind the ventures — incubating and spinning out what works.
opendeluxe.com ↗Most city-recommendation tools are listicles with nice photos. nestfainder.ai is a semantic engine: 22,000+ cities, 750,000+ districts & neighborhoods, 180+ signals across 35+ data sources, 67 filters, TOPSIS multi-criteria scoring, and LLM-generated narratives that actually explain the ranking.
Stack: Go · Python · Flutter · PostGIS · pgvector · OpenAI · self-hosted LLM
Visit nestfainder.ai ↗
axiomreal.aiWaitlist openThe B2B engine behind nestfainder — same location intelligence, institutional scale.
PropTech · Real estate · Location intelligence
City-level real-estate data is too coarse and lags the market by months. axiomreal.ai scores 750,000+ districts worldwide on estimated net yield, market momentum, and long-hold climate risk — with AI-generated investment memos that cite the data, state a verdict, and never hedge.
Signals: Net yield · Momentum · Climate risk · NDVI · TCFD / SFDR aligned
Join the waitlist ↗Dogfood, not a demo — I built it for my own teams, for myself, and for founder friends.
Manual timers are guesswork. tardis.sh turns ambient engineering signals — git commits, container runs, AI-agent activity, window and idle state — plus plain-language input and a native MCP + REST layer into billable hours, a review dashboard, and draft invoices (lexoffice, SevDesk, QuickBooks, CSV).
Stack: MCP · REST · macOS menu-bar (open-source) · lexoffice · SevDesk · QuickBooks
Join the waitlist ↗Equity partnership for the zero-to-PMF sprint. I bring the product, the first architecture, and everything ready for sales to start.
Hands-on leadership during scale, pivot, or replatform. I ship code and run the team. No drive-by advisors.
For investors and acquirers. Codebase, architecture, and team assessed with the eye of someone who's been on both sides.
In partnership with Philipps & Byrne ↗
A senior sounding board for founders, CTOs and technical co-founders: the architecture calls, the agent operating model, and the co-founder and fundraising decisions you can't Google. And when you want the hands-on skill — Claude Code and self-hosted LLMs, the exact workflow I use to solo-build nestfainder.ai.
“I rarely come across true tech talents who stand out like Hagen. I had the pleasure to co-found and grow the education technology start-up Zizzle with Hagen over the last few years. I admire Hagen not only for his exceptional proficiency in solving technical challenges but also for his ability to communicate complex problems in a clear and easy-to-understand manner. His wonderful sense of humour lifted the team’s spirit on countless occasions – talk about ways to increase productivity! Bringing together the ability to communicate effectively and the drive to continuously develop his technological expertise, Hagen has all it takes to take on technical leadership roles at any company.”
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 | 14 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 | 21 comments
One co-founder slot per year, a handful of interim CTO roles, a few DD projects, and a small coaching cohort. If the timing lines up, let's talk.
