ABOUT
Sebastian Keller
Software · Electronics · Automation · Audio
BIO
I'm a software developer, electronics engineer and maker. My focus is on solutions that need little and can do much – lean in architecture, efficient in operation, maintainable long-term.
I prefer self-hosted systems over cloud subscriptions, lean code over framework accumulation, and hardware that can be repaired over hardware that gets discarded after three years.
My projects often emerge at the intersection of disciplines: software meets electronics, efficiency meets aesthetics, simple means meet complex requirements.
An expanding area: locally hosted AI solutions. Inference on own hardware, without sending data to external APIs – control stays with the operator, costs stay predictable.
PRINCIPLES
LeanNo library that hasn't earned its place. No service that isn't truly needed. The smallest approach that solves the problem is usually the best.
Resource-EfficientLow CPU, low RAM, low energy, low cost. What runs on a small server or a cheap microcontroller needs no expensive cloud infrastructure.
Self-HostedOwn control over data, software and costs. No vendor lock-in, no monthly subscriptions for things you can run yourself.
LastingBuilt to last – not to be replaced by the next framework in two years. Maintainability and readability are not extras, they are requirements.
RepairableRepair and extend hardware instead of discarding it. Document circuits, keep firmware open, don't lock devices into cloud service dependency.
Open SourceBuild on what's proven, give back what makes sense. Proprietary only where there's a real reason.
TECH STACK
Frontend
Next.jsReactTypeScriptTailwind CSSThree.js
Backend
Node.jsPythonRustPostgreSQLREST/GraphQL
Infra
DockerLinuxNginxGitLab CISelf-Hosting
Elektronik
ESP32ArduinoSTM32KiCadRaspberry Pi
Audio
Ableton LiveMax/MSPSamplingSound Design