Sebastian Schürmann

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.

Full CV

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.

All repositories

es6-fuzz

ActiveTypeScriptnpm

Fuzzy logic and sets for JavaScript & TypeScript. Robust mathematical foundations with full TS types — the mature flagship.

50 2k/moMIT

claude-ecosystems-skills

ActiveTypeScriptLLM / AI

Specialized skills for LLM agents — file-system operations and codebase analysis within the Claude ecosystem. Actively developed.

actively developed

ecosyste_ms_cli

ActivePythonCLI

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.

3 actively developedMIT

dada-tbd-tui

ActivePythonCLI

A terminal-based wizard for updating the dadamachines TBD-16 — a friendly TUI front-end for the hardware's firmware/config flow.

2 actively developed

Projects

Things I build and run beyond the libraries — workshops, games, and other published work.

Pair Programming Workshop

WorkshopCreative Commons

A two-day workshop on pair programming — collaborate, share knowledge, and grow together. Open source and Creative Commons licensed.

Sauglump Games

GamesIndie

Where I publish my game experiments and demos — like match3-rpg, blending classic mechanics with new ideas.

Writing

Latest posts live on dev.to — the hub links out, the posts live where the readers are.

Read on dev.to

Earlier writing · 2014–2021

Agile, XP, mob programming, and team coaching — earlier work, kept for the record.

Explore archive

Talks

Selected presentations on tooling, architecture, and team dynamics.

All talks
2025

All AI Art Is **** — and the Consequences for Gen-AI-Enhanced Software Development


2026

Building Open Source with LLMs


2025

Of Chameleons, Pipelines, Compliance, and Open Source

Bitkom