I have 10+ years of professional expertise in the Information Technologies (IT) industry, including 6 years of commercial experience with Ruby on Rails and Javascript. I worked with REST API, pure Ruby, single page and classic server rendering applications, solving all kinds of web-development problems from finding sneaky bugs to building fully-functional complex services. Last 2 years I spend working on a Spree-based e-commerce platform for selling handcrafted furniture. Here are some of the achievements: - Significantly improved legacy codebase focusing on readability, decreasing complexity and covering with unit tests. - Improved performance. The slowest pages had more than 400% loading speed boost. - Implemented useful and exciting features, like adding a special section on the site for engaged people where they can pick up presents they want for a wedding and guests can order them afterwhile.