Jáchym dealt with the development of GRASS GIS, then he started to hack in Python. He contributes to the OpenLayers library and he collaborates on a variety of web applications, such as the National Geoportal INSPIRE or Geosense. He is the initiator and originator of the PyWPS project. He runs GeoPython programming training, supports GRASS GIS training and web mapping technologies. He is a founding member of the Open GeoInfrastructure Association and a member of the Open Source Geospatial Foundation.