Shopware is hot and shipping with plenty of features that make developers enthousiastic. What better to play around with the code, then to join a group of like-minded developers to collaborate on some project for a single day?
Any topic could be picked up to work upon: A certain PR towards the Shopware core, an open issue, some dev extension that you have meaning to create for some time. And the recommended way to do this is by working together: Peer programming (perhaps by using JetBrains Code With Me), group brainstorm, buddying, you name it. The idea is to have fun with others and to learn something from it.
Jisse gives cool training courses that you can put to good use in practice. Besides being informative, it is also fun to listen to. Roy van Os (Active Ants)
The training made pure abstraction manageable and digestible Marko Beenink (Mountain IT)
After the Magento 2 bootcamp, my fear of cold feet has subsided. Jisse gives a broad picture of Magento 2 and I now understand a lot better what is possible. Maartje Meering (MDL Online)