Position: R&D Senior Frontend Engineer
Category: JavaScript
English level: upper
Years of experience: 11

Founder and organizer of IT conference with 500-600 attendees per event. Details in CV.
I am R&D Senior Frontend Engineer now, with 11 years of JS/Frontend experience.
I am not a typical "framework-dev", I am Frontend/JS-dev. I know JS like the back of my hand. 

Interviewing candidates, reviewing pull requests, refactoring code, supporting developers when they are stuck, migration from Backbone to React/Redux, migration from "VanillaJS/jQuery" to ReactJS/etc, migration from Grunt to Webpack, performance optimizations, writing tests, creating CI/CD pipelines using Groovy, etc.
I prefer a product company (with its own product or which works only with a certain customer).
But I consider other options too.