Andreas Gollenstede provides geoinformation, mapping, web development, multimedia, and training services, with a focus on practical digital solutions for spatial data. His GIS work includes processing, analysing, and visualising geographic information; cartography; developing branch information systems and geodatabases using PostgreSQL and PostGIS; and creating web maps with tools such as MapServer, OpenLayers, and Leaflet. Software development in Python and C# is also offered.

For internet projects, services include web development, database work with systems such as MariaDB, content management solutions including WordPress, and web hosting. Multimedia services cover application development, eLearning, and multimedia cartography. Andreas also provides QGIS courses for beginners and advanced users, serving pupils, students, teachers, public administrations, companies, and organisations. Training can take place in Oldenburg or on site. In addition, he creates and updates maps, brochures, and books for print.

The site also features writing and research on cartographic visualisation, historical sources, movement data, and the responsible presentation of colonial provenance.