Patrick Horn-Project list — AI products from idea to production use
Check rate
Experience
Developer & Operator
OXO UG
Seitenkumpel — agents build websites for trade businesses, unattended. Own product, live.
- Agents research public company data and build complete websites from it, with nobody watching
- A validation layer makes sure extraction errors fail loudly instead of passing quietly
- Acquisition runs through a postcard funnel with a screenshot and a QR code, subscription model from 79 euros a month
- Result: several hundred websites built, running unattended
- Honest limit: there are no paying subscriptions yet — the funnel is built, the revenue is not there
Stack: agent workflows built directly without a framework, Claude and OpenAI APIs, TypeScript, Node.js, PostgreSQL, Cloudflare Workers, web scraping, data enrichment
AI Engineer (Freelance)
Real-estate finance firm, Munich (client)
Evidure — AI analysis memos from due-diligence data rooms. Paid client project, in daily use.
Agents read financing and due-diligence documents and draft finished analysis memos: multi-step online research, validated fields, every statement carrying its source
Cases the model is unsure about go back to the analyst instead of passing through unnoticed — the thresholds are calibrated on real documents, not on a test set
Prompt quality is measured against a fixed set of test cases; without it you cannot tell whether a change fixed a problem or just moved it somewhere else
Built and owned end to end on my own: document intake, retrieval, orchestration, approval workflow, interface
Result: from data room to finished memo in about twenty minutes, in daily use by the analysts since it was built
The same client came back for a second project
Stack: Claude Agent SDK, Claude and OpenAI APIs, MCP, RAG with source attribution, evaluation and test sets, React, TypeScript, Node.js, Supabase, PostgreSQL, Cloudflare Workers
Full-Stack Developer (Freelance)
Real-estate finance firm, Munich (client)
Corporate website with a protected client area — second engagement from the same client after Evidure.
- Design, implementation and operation from one hand
- Protected client area on top of the public site
- That a client comes back for a second project is the part I would look at first if I were hiring
Stack: React, TypeScript, Supabase, Cloudflare
Developer & Operator
OXO UG
HyPeMa — SaaS for cold outreach. Own product, live.
- Manages leads, pre-qualifies them and runs email sequences with minimal manual intervention
- Tenants are strictly separated from each other and sequences keep running unsupervised
- Anything that fails lands in a visible error path rather than nowhere
- Deliverability is the actual engineering problem here, not the sending: authentication chain with SPF, DKIM and DMARC, monitoring, engagement handling
Stack: TypeScript, Node.js, Supabase, PostgreSQL, OpenAI API, multi-tenant architecture, mail infrastructure
Co-Founder & AI Builder — AI products from idea to production
OXO UG
- Co-founder of OXO, a small studio that builds and runs its own AI products alongside client work
- I handle development, operations and client contact myself — from the first conversation to the running system
- Client work includes Evidure, an AI system for a Munich real-estate finance firm that has been in daily use since it was built (own entry below)
- Agent workflows built directly on the Claude Agent SDK and model APIs, not through a framework
- RAG with source attribution, evaluation and test sets, human-in-the-loop wherever being wrong is expensive
- TypeScript, Node.js, React, Next.js, PostgreSQL, Supabase, Cloudflare Workers, Docker
- Claude and OpenAI APIs, MCP — Claude Code daily
- I read and adapt Python but develop in TypeScript and Node
- Remote, delivering on my own without subcontractors
Developer
OXO UG
classmAite — AI learning companion used in schools, in three languages. Live.
- Built from prompt and agent design through to the interface
- Running in real school use, which means real users who are not developers and do not read documentation
- Three languages, with the content model kept separate from the language layer
Stack: Claude and OpenAI APIs, React, TypeScript, Supabase
Founder & Operator
wirdruckendeinauto
wirdruckendeinauto — own e-commerce business for custom car art. Running since 2020.
- Built and ran the shop for six years: over 1,000 cars drawn, 4.7 out of 5 on Trustpilot, mid five-figure total revenue
- Managed six freelance artists, from assigning commissions through to invoicing
- Moved the shop off Shopify onto my own codebase in 2026: the customer uploads a photo of their car, picks one of four AI styles, and sees an instant mockup on the print products
- Six years of running something that has to work without me watching it, with real customers, real refunds and real deadlines
Stack: TypeScript, Node.js, React, PostgreSQL, Stripe, image generation via model APIs
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Arts and Crafts, Retail, Information Technology, Banking and Finance, Real Estate, and Education.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Operations, Product Development, Sales, and Research and Development.
Summary
I build and run AI products from idea to production, with a focus on agent workflows that have to work reliably in daily use. I work hands-on across development, operations and client contact, and I care a lot about validation, measurable quality and fail-loud systems instead of silent errors.
My clearest work is in real-estate finance: agents that read due-diligence data rooms and draft analysis memos with source-backed statements, routing uncertain cases back to analysts. I also build web products and customer portals, and I run AI products of my own. My stack is mainly TypeScript, Node.js, React, Next.js, PostgreSQL, Supabase, Cloudflare Workers, Claude and OpenAI APIs, MCP, Docker and Claude Agent SDK.
Skills
About
- Co-Founder Of Oxo, A Small Studio That Builds And Runs Its Own Ai Products Alongside Client Work
- I Handle Development, Operations And Client Contact Myself — From The First Conversation To The Running System
Evidure — Paid Client Project, Munich Real-Estate Finance Firm
- Agents Read Due-Diligence Data Rooms And Draft Analysis Memos Where Every Statement Carries Its Source
- Cases The Model Is Unsure About Go Back To The Analyst Instead Of Passing Through Unnoticed
- Prompt Quality Is Measured Against A Fixed Set Of Test Cases, Calibrated On Real Documents
- From Data Room To Finished Memo In About Twenty Minutes
- In Daily Use Since It Was Built — And The Same Client Came Back For A Second Project
Own Products, Live
- Seitenkumpel — Agents Research Public Company Data And Build Complete Websites For Trade Businesses, Unattended. Several Hundred Built; No Paying Subscriptions Yet
- Hypema — Multi-Tenant Saas For Outreach. Sequences Run Unsupervised, And Anything That Fails Lands In A Visible Error Path Rather Than Nowhere
- Classmaite — Ai Learning Companion Running In Schools, In Three Languages
How I Build
- Agent Workflows Built Directly On The Claude Agent Sdk And Model Apis, Not Through A Framework
- Rag With Source Attribution, Evaluation And Test Sets, Human-In-The-Loop Wherever Being Wrong Is Expensive
- Typescript, Node.Js, React, Next.Js, Postgresql, Supabase, Cloudflare Workers, Docker
- Claude And Openai Apis, Mcp — Claude Code Daily
- Remote, Delivering On My Own Without Subcontractors
- I Read And Adapt Python But Develop In Typescript And Node
Languages
Education
Munich Business School
Innovation & Entrepreneurship · Munich, Germany
Ludwig-Maximilians-Universität München
Bachelor's Degree, Focus: Digital Business and Marketing · Business Administration · Munich, Germany · 2.1
Gymnasium Königsbrunn
High School Diploma (Abitur), Focus: Natural Sciences · Natural Sciences Focus · Königsbrunn, Germany · 1.8
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Patrick is based in Königsbrunn, Germany and can operate in on-site, hybrid, and remote work models.
Patrick speaks the following languages: German (Native), English (Advanced), French (Elementary).
Patrick has at least 6 years of experience. During this time, Patrick has worked in at least 6 different roles and for 3 different companies. The average length of individual experience is 1 year and 11 months. Note that Patrick may not have shared all experience and actually has more experience.
Based on recent experience, Patrick would be well-suited for roles such as: Developer & Operator, AI Engineer (Freelance), Full-Stack Developer (Freelance).
Patrick's most recent position is Developer & Operator at OXO UG.
In recent years, Patrick has worked for OXO UG, Real-estate finance firm, Munich (client), and wirdruckendeinauto.
Patrick is most experienced in industries like Arts and Crafts, Retail, and Information Technology. Patrick also has some experience in Banking and Finance, Real Estate, and Education.
Patrick is most experienced in business areas like Information Technology, Operations, and Product Development. Patrick also has some experience in Sales, Research and Development, and Marketing.
Patrick has recently worked in industries like Arts and Crafts, Retail, and Information Technology.
Patrick has recently worked in business areas like Information Technology, Operations, and Product Development.
Patrick holds a Master in Innovation & Entrepreneurship from Munich Business School and a Bachelor in Business Administration from Ludwig-Maximilians-Universität München.
Patrick is immediately available full-time for suitable projects.
Daily rate distribution
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Average rates for similar positions
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The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 6 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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