Position: Разработчик Ruby on Rails
Category: Ruby
English level: upper
Years of experience: 5

Rewrote charts subsystem and metrics calculation to tolerate zero values absents, reduced database twice, from 1.2Tb down to 600Gb.
I implemented API integrations between different sources like FB/Google data studio/Constant Contacts and main data analytical project written on Ruby on Rails.
Fast communicated small team with easy new technologies apply. 
Well documented and covered by tests.