I build software systems that are concretely useful — AI-native products, developer tools, and platforms that give teams leverage. Currently at Stack Overflow, working on MCP capabilities, LLM orchestration, and retrieval systems. Previously shaped API governance at Zalando and created Zally, their API linter (Thoughtworks Technology Radar 2021).
- tessariq (Go) — Git-native infrastructure for agent work: sandboxed runs, reviewable results, artifacts that stay yours
- taskrail (Go) — Deterministic execution harness that turns goals into structured tasks with validation and follow-up
- voxclip (Go) — Privacy-first CLI for voice recording and transcription, runs locally with Whisper
- jarvis (Kotlin) — LLM-powered developer plugin for JetBrains IDEs
- scribae (Python) — CLI to turn Markdown notes into SEO briefs, drafts, and translations using LLMs
- fabulae (Python) — CLI-first toolkit for building narratives from versionable building blocks
- Created Zally, Zalando's API linter — won Hack Week, grew to a dedicated team, listed in the Thoughtworks Technology Radar (2021)
- Led Zalando's API Guild and co-shaped their open-source API Guidelines
- Published No More Technical Debt — Invest in Quality
Go · Python · TypeScript · Kotlin | fmueller.io





