Dr. Stefan Schimanski sttts

Stefan Schimanski 👋

I build software: developer tools, distributed systems, experiments, side projects, and the occasional weird machine.

Publicly, that currently looks like:

🧠 nanoschnack — language model training and tokenizer work — Python, Go — 📺 KubeCon
🕸️ kausality — causal traceability for Kubernetes resource mutations — Go — 📺 KubeCon
🔗 kube-bind — invented CRD binding across Kubernetes clusters — Go — 📺 KubeCon — 📺 ContainerDays
🌐 multicluster-runtime — invented and bootstrapped multi-cluster controller-runtime — Go — 📺 KubeCon
🤖 slagent — Claude talking to Slack — Go
☸️ kc — Kubernetes Commander — Go
🌐 kubectl-http — HTTPie as a kubectl plugin — Shell
🕹️ claw64 — an OpenClaw-inspired Claw for the Commodore 64 — Go
🧩 xf-cli — XenForo CLI and MCP tooling — Go
🧪 shell-ai-widget — AI-powered inline shell command editing — Go
🏠 ha-git-backup — Git-backed backup add-on for Home Assistant — Shell
🎮 kbounce — Godot recreation of KBounce — GDScript — Web — App Store
⚡ godot-quickjs — QuickJS embedded into Godot 4 — C++
🔧 crd-gates — feature gates for CRDs — Go
🧱 blender-wrl — Blender plugin for importing WRL files — Python
📚 tvniki — a revived programming learning system from 1996 — Pascal

A lot of my work happens upstream rather than only in personal repos.

☸️ Kubernetes — 620 merged PRs across core code and API machinery, including co-authoring CRDs and Watch List, crucial for large AI clusters — Go
🧩 kcp — 366 merged PRs across the kcp ecosystem, architectural lead during the Red Hat era, still project advisor, and helped get it into CNCF Sandbox — Go
🔴 OpenShift — 745 merged PRs across the OpenShift org, including many years as control plane lead — Go
🌍 contributions across Crossplane and related projects — Go

All talks: YouTube

Older projects and ecosystems that still represent what I build:

🐧 KDE — core contributor: KBounce, KMixer, Konqueror, browser plugins, and khtml, later becoming WebKit by Apple and today used in nearly every browser — C++, Qt
☁️ Kubermatic — invented Kubermatic, predecessor to Cluster API and HyperShift, later sold to Loodse, today Kubermatic GmbH — Go
⚙️ elastic-etcd — elastic discovery wrapper around etcd — Go
🐳 kubernetes-dind-cluster — early Docker-in-Docker Kubernetes dev clusters, an ancestor of kind — Shell
🏗️ compute-platform — Mesos-based compute platform — Shell
🚀 kubernetes-mesos — Kubernetes on Apache Mesos — Go
🏃 Marathon — container orchestration on Apache Mesos — Scala
🛰️ mesos-dns — DNS-based service discovery for Mesos — Go
📧 ldap-notify — LDAP password and login expiration notifications — Python
🗺️ google-maps-mock — Google Maps JS mocking for tests — JavaScript