Have you known that Codeforces Watcher is an open-source application? Have you ever heard of Redux pattern, Android Development and Kotlin programming language?
![ ](https://mirror.codeforces.com/974dba/2019-09-23 16.12.40.jpg)
If you are interested in at least one of those things, check out our article on Medium, where we are telling about the beginning of migration of Codeforces Watcher to Redux.