Talk at Svelte Society Berlin, Sep 2, 2026. The slides, spec-driven and agent-built like the project they describe.
- Svelte
- Animotion
- Reveal.js
Specced, not vibed.
I work out what a system should do and why, then build it with AI in the loop.
Projects
Berlin's open data on one map: 65 layers, a Kiez-Score and a Kiez-Finder. Spec-driven, agent-built, human-reviewed.
- SvelteKit
- TypeScript
- MapLibre
- PostgreSQL
One memory for Claude Code, Codex and other agents: Markdown notes in your own Git repo, one CLI, and an import of what each agent remembers on its own. Agents forget. rcllr recalls.
- TypeScript
- Node
- Git
- Markdown
Browse and compare 254,000+ CPC and 80,000+ IPC patent classification codes, with a 3D universe view. Built at mtc.berlin.
- SvelteKit
- TypeScript
- Threlte
- PostgreSQL
Patent intelligence for policy and business decisions: 20 reports on EPO PATSTAT Global, readable in full. Built at mtc.berlin.
- SvelteKit
- TypeScript
- SQLite
- Chart.js
Website audit in four dimensions: AI readiness, accessibility, SEO, speed. Findings with code quotes and fixes to copy. Built at mtc.berlin.
- SvelteKit
- TypeScript
- PostgreSQL
- Playwright
geoaud.it
SEO and AI search audits with brand monitoring, sold as SaaS. Turned into xcheck in 2026. Built at mtc.berlin.
- SvelteKit
- TypeScript
- tRPC
- PostgreSQL
- Inngest
- BullMQ
mmcp.dev
A memory MCP server for LLM agents. Promising prototype, shut down to focus.
- SvelteKit
- Node
- TypeScript
- Redis
- PostgreSQL
How I build
There are no vibes in a spec.
Every project starts with a spec. How much of it I write myself depends on the project.
- Idea
- Spec
- I write it
New products and unclear domains: brief, PRD, architecture, ADRs, UX, epics, stories.
- An agent drafts it
Smaller projects on known ground: one spec file. I read it and correct it before anything gets built.
- I write it
- Agents build
They build what the spec says.
- Checks
Lint, type checks, tests and build run before every push.
- Review
- Code
Always. No change merges unreviewed.
- Frontend and copy
Generated UI and text need review more and more. I check them against rules I wrote for design, UX, semantics and language.
- Code
- Prod
The spec is never optional. The ceremony is.
About
People say they get inspired. I get obsessed.
A new interest means hours of research and a knowledge base for everything. Sometimes it ends in a project:
- 2006 Kontempora Online print gallery for young photographers. Before Instagram existed.
- 2019 D'IGGY High-efficiency tick repellent. Named after the dog.
- 2025 Stimmungsschau Party sentiment analysis of German TV news.
- 2026 mmcp Multi-tenant memory engine for AI agents. Total tenants: one.
I'm really good at having ideas. Not so good at running them. Some are different.
Around twenty years in the digital stack: strategy, architecture, project lead, earlier also code. Hands-on with LLMs since ChatGPT in late 2022. I work as Head of Platform & AI at mtc.berlin(opens in new tab).