Hi, my name is David Marko, I live in Czech republic and I'm working as software developer and architect for more than 2 decades now. I've been working with Vaadin, SpringBoot, MongoDB and Elasticsearch mainly since Vaadin version 7 by building customer specific applications with focus on integrity, user friendliness and long time maintenance.

Currently I have following certifications:

• Certified Vaadin 14 Professional
• Certified Vaadin 14 Developer
• Certified Vaadin 8 Professional
• Certified Vaadin 8 Developer
• Vaadin 7 Certified Developer
• SalesForce Developer and Administrator
• Certified MongoDB Developer in JAVA
• Certified MongoDB Administrator
• M320: MongoDB Data Modeling