This was my first Magento hackathon and I enjoyed it very much. Great people, cool projects and a nice location.
These are not all pictures I took. More pictures can be found here: Google Photos > Andreas Koch > FireGento Hackthon Leipzig Mai 2015
I worked with https://twitter.com/sylvainraye and Daniel Zohm on the Mage Monitoring Module and integrated some new checks.
A recap (german) of the Hackathon can be found on the FireGento website: FireGento » Der Magento Hackathon in Leipzig 2015