# 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://advisory.engineer.company/portfolio/led-the-development-deployment-and-support-of-over-35/) - [Designed the product's UI and UX end to end — directory grids, dual card/table views, live requirement validators and breadcrumb navigation.](https://advisory.engineer.company/portfolio/designed-the-product-s-ui-and-ux-end-76/) - [Built the platform's social layer — posts, feed, groups, mentions, a follower graph and an occasions digest — on the same function‑first data layer as the rest of the product.](https://advisory.engineer.company/portfolio/built-the-platform-s-social-layer-106/) - [Established PDF/UA‑1 conformance across nine documents at 106 of 106 rules, and found the archival variant failing one rule of 146 — a near‑miss that reads as a pass to anyone not running the validator.](https://advisory.engineer.company/portfolio/established-pdf-ua-1-conformance-across-nine-documents-146/)