Some may say certificates are not important. You just get some paper you can proudly hang on the wall or put badge in your CV. However, getting certificate gives you a chance to pack together all knowledge you have and check how good you understand a certain topic. During last year I’ve got some AWS certificates mostly required by my job. Still, I want more certificates. Why? Because you learn a lot when you pass them, and also, when you fail.

Intro I came to the world of programming through a Java path. And during my entire career I was programming mostly in Java. When Kotlin became more and more popular in the programming world I wanted to answer the question is it worth to use Kotlin in Java project or not? And it turned out, as always in an engineering, that an answer is - it depends. This post is the way of a company I was working for and our experience.