Skip to main content 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.

GitHub Blog
01 / 05 GLSL

    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
    Recent roles
    Year
    Role
    Company
    2025Unit Head, Webservices & TypeScript BackendsMaibornWolff
    2023Principal Cloud ArchitectMaibornWolff
    2020Head of ITJura Online
    2014Self-employed Coach & DeveloperIndependent

    Open Source

    Projects I maintain and actively develop.

    All repositories

    es6-fuzz

    Active
    TypeScript
    npm

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

    50 2k/moMIT

    claude-ecosystems-skills

    Active
    TypeScript
    LLM / AI

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

    actively developed

    ecosyste_ms_cli

    Active
    Python
    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.

    3 actively developedMIT

    etherscan-api

    Active
    JavaScript
    npm

    API to Etherscan with a simple interface — Etherscan V2, multichain. A long-running, widely depended-on library with a fresh release.

    552 13k/moMIT

    banira

    Active
    TypeScript
    npm

    A toolchain for developing web components using vanilla JavaScript. Actively developed, with recent npm releases.

    1 500/moMIT

    dada-tbd-tui

    Active
    Python
    CLI

    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

    rewelo

    Active
    TypeScript
    CLI
    MCP

    Relative-weight backlog prioritization — score tickets on benefit, penalty, estimate and risk, then rank by value/cost. SQLite-backed, usable as a CLI or as a Docker-based MCP server for LLM agents.

    2 v0.5.0 · Sep 2026MIT

    Projects

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

    Pair Programming Workshop

    Workshop
    Creative Commons

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

    Visit site

    Sauglump Games

    Games
    Indie

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

    Visit site

    maschinenlesbar.org

    TypeScript
    CLI
    Open Data

    A growing family of TypeScript API clients and CLIs for German open-data and public-sector APIs — Bundestag, DWD, Destatis, Autobahn, NINA, GovData and 30+ more. Published on npm under @maschinenlesbar.org.

    Visit site

    Writing

    The latest from the blog — tooling, AI-assisted development, supply chains, and how teams work.

    All posts

    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