# Web Development > Selected Engineer ApS work demonstrating Web Development — the achievements that prove it. - [Led the development, deployment, and support of over 30 GIS projects, demonstrating expertise in PostgreSQL, Bash, Python, JavaScript, GDAL, ArcGIS, PostGIS, and Mapbox technologies.](https://data.engineer.company/portfolio/led-the-development-deployment-and-support-of-over-35/) - [Generated 495 achievement pages across three languages from a read‑only SQLite export, with the page address authored as data so that correcting a sentence no longer moved the page and broke the link.](https://data.engineer.company/portfolio/generated-321-achievement-pages-from-a-sqlite-export-132/) - [Replaced 963 anonymous structured‑data blocks that restated the company 1,671 times with one linked graph of 16 types minted from stable origin identifiers.](https://data.engineer.company/portfolio/replaced-963-structured-data-blocks-with-one-graph-138/)