Frontend JS frameworks: React + Redux/MobX, Backbone + Marionette.
I have some experience with JAVA and PHP, but I can do same tasks much better with NodeJS.
Familiar databases: MySQL, Cassandra and ClickHouse.
I actively propagandized and used DevOps tools: unit-tests, end-to-end tests, continuous delivery, continuous integration.
As a developer I willing to expand my stack with functional paradigm, event sourcing, react-native, F#, Scala.
Here you can find some test tasks - https://github.com/FlaPS/react-redux-snake . I can show you some other code on demand.