Position: Разработчик Ruby on Rails
Category: Ruby
English level: upper
Years of experience: 6

* developed test culture and implemented 
continuous testing on the CircleCI,
* greatly reduced complexity of code by adding dry libraries and showing how to use them and wrote a guide about how to do this
* freed 30% of system resources by optimizing callbacks and database requests
For most of my career, I worked as a backend Ruby on Rails engineer. Mainly it was tasks related to business intelligence: reports, dashboards and data transformations. 
Also, I can mention the next projects:
* Nitka - my current place - stack: Rails 5, Postgres, AWS - created dashboards, implemented continuous testing on the CircleCI, designed and implemented a leads tracking system 
* uchi.ru - an educational startup with 2 millions of active users - maintained BI system based on Rails 5 and Elasticsearch,  designed a two-component(SPA + API) application for visualizing statistics for heads of regional educational departments. Developed an API (Ruby on Rails) for it.

Right now I am improving my data engineering skills and going to grow in this direction.
Despite knowing the javascript and my small experience with web-frameworks, I do not want to grow in this direction