About Johannes
I build the "Plumbing" for the 2026 AI era.
While everyone is chasing prompts, I’m building the robust, type-safe architectures that make those prompts actually useful in production. With 5 years in the TypeScript ecosystem and several "founder scars," I specialize in building systems that are resilient, scalable, and easy to maintain.
My Core Stack:
Frontend/Full-stack: Next.js, React, Turborepo.
Backend/Infra: Node.js, Prisma, PostgreSQL (Vector-ready).
Applied AI: Bridging LLMs with structured data and real-world logic.
I help companies move from "it works on my machine" to "it works for 100k users." If you’re looking for an engineer who thinks like an owner, let's connect.
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Kern-Di.FounderFebruary 2026 - Today (4 months)Founding a start-up that generates websites for the blue collar sector in Germany. Building a factory for that. Developing product vision, strategy, ...
- AgentReadyCo-FounderE-COMMERCEMay 2025 - October 2025 (5 months)Berlin, Germany- deeply involved in customer discovery process in e-commerce- iterating and generating ideas quickly to find product market fit- learned lots of lessons on how to build a product, how to build a company,increasing my stack to include the customer & product view- developed free web service & landing page to analyze schema.org data of e-commerce domains- developed strong knowledge in LLM capabilities and context engineering- developed agentic n8n workflow to automatically process written unstructuredcustomer requests into structured data- developed e-commerce MCP server that allows agents to order products onwebshop- involved in MCP open-source community to find technical solutions for MCPdiscoveryalso during this time:- winning 2/2 24h hackathons in Berlin run by Tech:Europe- taking the lead in product & architecture design- managing team-internal communications -- making sure we're buildingsomething that actually works- tieing all the moving parts of the team together in code last minute, both timesleading to us winning our tracks
- FreelanceFull Stack Software EngineerSeptember 2024 - Today (1 year and 9 months)Supporting several startups as well as SMEs.- Development and maintenance of a SaaS platform for digital business cards from 0 to 1, including automatic sync with Microsoft 365 data- Development and maintenance of a SaaS platform for managing managed mobile devices from 0 to 1, including data synchronization with various data sources- Development and maintenance of e-commerce shop and attached, custom project management platform- Development and maintenance of a photo-upload to 3D globe mapping community platform- Direct communication with technical and non-technical clients
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Education
- Bachelor of ScienceHamburg School of Business Administration2021BSc Business Informatics Co-operative Bachelor's degree programme at the interface between business studies and IT. Specialized on IT, but also gained a lot of knowledge about business and strategy.