About me

Hello, I’m Eugene Petrenko, human. You may also know me as @jonnyzzz. In real life, I’m also Evgeny Petrenko and Евгений Петренко.


Eugene is a developer advocate at JetBrains, software developer, speaker, and blogger. His interests include software development, distributed systems design, cloud computing, and programming languages. Eugene holds a PhD in computer science; he writes code in Kotlin, Go, Java, C/C++, Kotlin/Native, and JavaScript. A Kotlin fan for years, he started using Kotlin before 1.0 and completed his first production Kotlin app back in 2013.

You may find several photos of me here and there. The best photo for conference sites.

I spoke at many events and I’ll be happy to speak at your event (say on Kotlin or Kotlin/Native) too, feel free to reach me out via twitter or email to me at jonnyzzz.com

Certificate, Diplomas and Courses






  • German Language B2 from Goethe Institute, Munich, Germany. ✅ certificate
  • Media Training ✅ certificate
  • Oracle Certified Professional

And few more certificates at my LinkedIn Profile

More Info

I’m a developer advocate at JetBrains and software developer who speaks at conferences, writes blog and codes in Kotlin.

I work in the IT field for more than 18 years

At JetBrains since 2004. Participated in several well-known products, including ReSharper, TeamCity, Upsource, Toolbox App and other (yet) internal projects.

My kid names have 4 common letters: Alexej and Alexander. Some people are not even able to tell the difference between these names. My free time I mostly spend with my family. Some times I hack on some new experiments (likely in Kotlin), write new blog posts, speak at conferences or meetups or learn something new. Follow me on twitter and you will see.

I write code daily in different languages, including (but not limited to) Kotlin, Java, C/C++, Go, JavaScript.

You may find some of my idea and texts on Blog, projects, talks, and contributions. Most of experiments land to my GitHub profile.

Saint Petersburg, Russia is the city I grew up. I studied at Saint Petersburg State University, at the Faculty of Mathematics and Mechanics. I got Ph.D (in russian) in computer science in 2009.

I live in Munich, Germany since 2011.

Eugene Petrenko bio photo