Data & software engineer. Building open tools for nature, climate, and public data.
Founder of datalegends.nl. I work on open-source software for the public sector. Public money, public code.
Built data infrastructure powering data.amsterdam.nl:
- parkeerscans — Mapping parking pressure through scan data
- afvalcontainers — Underground garbage disposal bins
- bag_services — Building Address Registry (BAG) API
- handelsregister — Handelsregister (HR) data API
- parkeervakken — Parking lot data with REST API
- Tegola — Mapbox Vector Tile server in Go (contributor)
- pg_tileserv — Thin PostGIS-only tile server (contributor)
- vector-inspector — Visual inspection of vector tile sources
- openmaptiles — Vector Tile Schema Implementation (contributor)
- DEGO — Energy transition data platform (dego.vng.nl)
- DOOK — Public safety data platform (dook.vng.nl)
- Signalen.org — Municipal issue reporting system for the Netherlands
- NLX — Inter-organisational federated authentication for API landscapes
- python-snap7 — Co-created the open-source PLC communication library. ~50 million downloads for a niche industrial automation problem.
- lambda_db — In-memory database with HTTP API (Go)
- csvpgvoer — Feed CSV data into PostgreSQL with row validation (Go)
- Nature data — Working on biodiversity and habitat data infrastructure in the Netherlands. The current systems need improvement; I'm building better ones.
- AI-powered engineering — Moving from traditional data engineering to agentic, AI-assisted tooling.
- datalegends.nl — Data stories and experiments.
Python · Go · PostgreSQL · Mapbox/Vector Tiles · Kubernetes · Django · Flask · Docker
- GitLab: gitlab.com/spreeker — most active
- GitHub: github.com/spreeker
- Blog: datalegends.nl
- Email: stephan@datalegends.nl
- Code for NL Fellow: codefor.nl/code-fellows