Fifteen years turning hard problems into software — distributed storage, core banking, and applied AI. One of the first engineers at a European neobank; now building something new in fintech.
One idea runs through everything I build: correctness you can prove at every layer — from the byte on disk to the balance on a statement.
Started at eleven in C and assembler. Later, ZFS filesystem drivers on Solaris/Illumos — where every block is checksummed and integrity is not negotiable.
Built a core banking ledger and AML services from zero under BaFin supervision. Double-entry bookkeeping: every cent reconciles, or the system is wrong.
Now applying that same discipline to AI for wealth management — orchestration, retrieval, and agents where the output has to be trusted with real money.
Founding engineering on a new financial product.
One of the first engineers. Built the in-house ledger and AML from zero under BaFin, then current accounts, interest products, and SEPA & card payment rails.
Recruiter intelligence platform, sourcing and insight for the people who place people.
AI writing tool that drafts researched, publish-ready articles from a single idea.
Built and scaled a leading German-language ETF platform, solo, end to end.
LLM-powered book summaries, before it was a category.
Backend for cloud storage in Go and C; maintained ZFS drivers and migrated Telekom Magenta Cloud with minimal downtime.
An opinionated Domain-Driven Design template for Go, with a full guide — a reference architecture other engineers build production systems on.
View repository →A neo-grotesque type family I drew and open-sourced — variable, roman and italic. You're reading it now.
View specimen →I release the patterns I'd want to inherit. Alongside these, a decade of work most people never see the source of: