01
Frontend
Interfaces that feel engineered, not assembled.
- React
- TypeScript
- Next.js
- Tailwind
- WebGL
Full-Stack engineer · Applied AI · Kiel, DE
Most products don't fail on the idea. They fail on the handoffs. With me there are none. I build the whole thing myself, from the first sketch to production.
4 products live · built solo, end to end · AI · real-time · payments
01 · The stack
No agency layers, no handoffs. One person who covers the whole surface of a product and ships it.
02
Backend
Data models, APIs and auth that hold up in production.
- Node.js
- PostgreSQL
- REST + realtime
- Auth
03
Applied AI
Models wired into real workflows, not chat demos.
- LLMs
- Retrieval
- Route generation
- Multilingual TTS
04
Real-time
Live state, presence and dashboards that update themselves.
- WebSockets
- Live presence
- Live dashboards
05
Maps & geo
Software that knows where things are and where they should go.
- Routing
- Geofencing
- Maps APIs
- Location UX
06
Payments & Go-Live
From checkout to signed PDF to production deploy.
- Stripe
- PWA
- Signature
- Deploy
- CI
- 04live products
- 12languages shipped
- 02cities live with jawnt
- 100%built solo
Inbound: 2 flagships · 2 companions
Talk is cheap. Here are the products that are live.
Real products, real users. Each one the whole thing, built alone.
02 · Flagship
AI field service planning that organizes a tradesperson's whole day.
Routes built on real Google Maps travel times, not straight lines. Invoices signed on site with a finger and ready as a PDF. Plus an automatic mileage log and a rescheduling that kicks in the moment a job blows up the plan. Built for heating, plumbing and electrical businesses across Schleswig-Holstein.
- Route optimization
- Maps API
- Signature
- Dispatch
03 · Companion orbit
Event ticketing that turns promoters into a gamified sales engine.
Points, levels, streaks and real-time leaderboards turn every promoter into a competitor. Payments via Stripe, tickets by QR, a door scanner right in the browser. And every sale lands live, the moment it happens.
- Gamified sales
- Stripe
- QR tickets
- Door scanner
- Real-time
04 · Flagship
A city guide in your ear that composes your tour from three answers.
Tell it how much time you have, what you're into and where you're standing. From that it builds you a personal route with source-checked narration in your ear, in 12 languages. Plus quizzes and a treasure hunt for families. No app, no account, all of it runs in the browser.
Two cities are live already, more are on the way.
- Applied AI / LLM
- TTS
- 12 languages
- Route generation
- Browser only
05 · Companion orbit
A real-time map as a social network. Go live, be seen.
Go live and people near you see your pin. Profiles, link in bio, pages for businesses and geofencing for events. A social layer drawn straight onto the map.
- Live location
- Profiles
- Link in bio
- Business pages
- Geofencing
06 · About
It all started pretty unspectacularly. I moved to Kiel to study business informatics, and somewhere between the economics lectures and my first real lines of code I realized what I actually want to do. Programming turned into a passion. Today I build complete products under the name Frenkel Systems, entirely on my own, from the first idea to shipping.
What drives me is never the single building block. I don't think in frontend, backend and AI, I build the whole thing, because that's the only way software really gets finished. The moment I do this for is always the same: when a product stops being a demo and starts doing real work. The tradesperson who reorganizes their day around traffic. The stranger who suddenly turns into a tour guide in your ear. The promoter who levels up with every ticket sold.
I build mostly for real businesses here in the north. Not slideware, but things that actually go into operation. Working alone is a deliberate choice: one person who holds the entire system in their head moves faster and cuts deeper than a room full of handoffs. Right now most of that energy goes into FieldPilot and jawnt, with the next cities and products already in the works.
If you're building something that has to work in the real world, tell me about it. I'll tell you honestly how I'd approach it.
// everything above, built solo
07 · Work with me
01
One owner
Design, backend, frontend, AI and deploy all sit in one pair of hands. Nothing falls between two teams, because there are no two teams.
02
AI that ships
Models wired into products people actually use, not demos. Four proofs are running live, you just saw them.
03
Solo speed
One head, no handoff overhead. Idea to production, fast, and at the quality of someone who has done it several times before.
Got a product in mind?
Tell me what you're building, and I'll tell you how I'd ship it.
or write directly:frenkelsystems@outlook.com