Hi, I'm —

Leonard

Zeutschler

"Let's build something fun together"
Full-Stack Developer✦Technical Consultant✦Lead AI Engineer
📍 Ruhr, Germany
📓 snoopMy /blog — lab notes, tag graphs, and "I should write that down" energy. Come browse; the door's open.
A few words

I'm Leonard — I write code, herd AI agents, and turn vague ideas into things that actually work. By day a Technical Consultant at CYBERIUM, by night co-founding 45level. I get a kick out of weird problems, neat APIs, and good coffee.

☕ Once tried to write a regex to match all valid regexes. The agents handle that now.
Leonard — watercolor portrait
Leonard, in the wild

what i can help with

⚡
Full-stack apps
Next.js, Vue, Python — from prototype to production.
🤖
AI engineering
Agents, NLP pipelines, Pydantic-AI, n8n flows that just work.
🧭
Technical consulting
Stack audits, team mentoring, architecture you can actually maintain.

Things I've shipped

🔒www.eve-ai.de
eve.ai

Emotion-aware AI that tests how communication actually feels, before it goes live.

Project Architecture & Frontendvisit →
🔒www.ceo-ranking.com
CEO Ranking

Ranking platform for corporate leadership visibility and performance.

Full Responsibilityvisit →
🔒hiceq.com
hiceq

The app powering CEO Ranking — data-driven executive insights.

Full Responsibilityvisit →
🔒padelfinder.de
Padelfinder

Find and book padel courts across Germany.

Co-Buildervisit →

Stuff I love using

(probably more hours at the keyboard than is strictly healthy)
▲ Next.js
⚛️ React
🟢 Vue.js
🔶 TanStack
🔷 TypeScript
📜 JavaScript
🐍 Python
🕸️ LangGraph
⚙️ Mastra
🤖 Pydantic AI
✨ AI Agents
🗣️ NLP
🔗 n8n
🐘 PostgreSQL
🧠 Vector DBs / RAG
☁️ GCP

Find me, fight me, fork me

in
LinkedIn
Say hi, send a meme, hire me.
→
< >
GitHub
Where the bugs are written.
→
◈
CYBERIUM
My day job. Pioneering digital transformation.
→
45
45level
Co-founded. AI engineering, the next level.
→
Drop a line. I read everything (eventually).

The journey so far

45level2025 → now
Lead AI Engineer & Co-Founder
Next-level business, data & AI engineering. Building agentic systems that ship.
CYBERIUM2024 → now
Technical Consultant
Pioneering digital transformation. Architecting full-stack solutions and leading technical implementations.
K&S Software-Systeme2017 — 2024
Front-End Developer → Full-Stack
Seven years from junior frontend to building complete applications. Grew from writing CSS to owning entire product stacks.
Henkel & BASF2016 — 2017
IT Internships
Worked in large cross-functional IT project teams at two DAX corporations. Learned a lot — and learned that big-org life wasn't for me.
Ruhr-Uni Bochum2015 — 2017
IT Security (Studium)
1.5 years of IT Security before pivoting to hands-on development. The crypto and network fundamentals still come in handy.
🎓 Education
Fachinformatiker, Anwendungsentwicklung
Heinz-Nixdorf-Berufskolleg
2017 — 2021