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