For the last week of November, 23rd-29th 2015, you have the opportunity to become a Vaadin Certified developer with no cost at all. With a Vaadin certificate in your CV and on LinkedIn, you have proof that you have what it takes to be a Vaadin expert. The certification test is an online test that you can take at home or at work any time.
There are 488 Vaadin Certified developers all over the world - they are mostly located in Europe and some unknown location.