Here goes the list (likely incomplete) of my contributions to open source projects. I will try to keep it up-to-date. You may also check projects or talks

teamcity-rest-client

https://github.com/JetBrains/teamcity-rest-client

Contributes several infrastructure changes and added more TeamCity REST commands

Apache Mina SSHD

https://github.com/apache/mina-sshd

Contributed a number of problems I had in production. Also a fix for an invalid key authorization bug. Overall reported those issues

IntelliJ IDEA Community Edition

https://github.com/JetBrains/intellij-community

Gradle Tests Performance Improvement. The pull request to use faster test output processing from Gradle.

Pathces and fixes to help Toolbox App to work.

OS Detector Gradle Plugin

https://github.com/google/osdetector-gradle-plugin

It was unclear how to use the plugin. I have improved the documentation.

Jackson Mr. Bean

https://github.com/FasterXML/jackson-module-mrbean

Java deserialization issue with generics and type erasure in Jackson Mr.Bean module.

Issue #1, Pull Request

Spek

https://github.com/JetBrains/spek

Created first version of the test runner implementation based on JUnit to have IDE/CI tooling integration for free.

TinyMission/kara

https://github.com/TinyMission/kara

Contributed infrastructure fixes and other improvements to DSL-based web framework in Kotlin