es6-fuzz
Fuzzy logic and sets for JavaScript & TypeScript. Robust mathematical foundations with full TS types — the mature flagship.
Sebastian Schürmann
TypeScript & Python developer. Open-source maintainer. I build developer tooling and write about it.
Maintainer of npm and Python packages, focused on developer tooling and open-source supply chains. I care about tools that teams can depend on. Based in Hamburg.
About
Twenty-plus years building distributed software and leading teams — from developer to architect.
I develop distributed software with teams — and help teams get better at doing it. My focus is agile, test-oriented development, distributed systems, and cloud/serverless architecture (AWS/CDK, Lambda, TypeScript) — building tools and processes teams can depend on. Based in Hamburg.
Recent roles
|
Year
|
Role
|
Company
|
|---|---|---|
| 2025 | Unit Head, Webservices & TypeScript Backends | MaibornWolff |
| 2023 | Principal Cloud Architect | MaibornWolff |
| 2020 | Head of IT | Jura Online |
| 2014 | Self-employed Coach & Developer | Independent |
Open Source
Projects I maintain and actively develop — not every repo, the ones worth depending on.
claude-ecosystems-skills
Specialized skills for LLM agents — file-system operations and codebase analysis within the Claude ecosystem. Actively developed.
ecosyste_ms_cli
Command-line interface to the ecosyste.ms APIs — package, repository, and dependency data across open-source ecosystems. Subject of the "Building Open Source with LLMs" talk.
etherscan-api
API to Etherscan with a simple interface — Etherscan V2, multichain. A long-running, widely depended-on library with a fresh release.
banira
A toolchain for developing web components using vanilla JavaScript. Actively developed, with recent npm releases.
Projects
Things I build and run beyond the libraries — workshops, games, and other published work.
Writing
Latest posts live on dev.to — the hub links out, the posts live where the readers are.
- Sep 2026 Epistemological corrosion created by machine induced semantic replication entropy
- Jul 2026 Resurrecting the Panasonic WJ-MX50 in WebGPU
- Jul 2026 Claude Lawfare
- Jul 2026 sudo 'schland just give me my data
- Jul 2026 Fallacies of distributed computing
- Jun 2026 A Rogue Registry in My Own Backyard: Anatomy of a Two-Line Supply Chain Attack
Earlier writing · 2014–2021
Agile, XP, mob programming, and team coaching — earlier work, kept for the record.
Talks
Selected presentations on tooling, architecture, and team dynamics.
2025
All AI Art Is **** — and the Consequences for Gen-AI-Enhanced Software Development
2026
Building Open Source with LLMs
2025