Working as a backend software engineer at Getting Paid cluster. Responsible for invoices&payments processing and development of white label payment gateway based on PayPal. Also a code owner of Quickbooks Online integration which is famous taxation platform in the United States.

Have been a lead of cross functional product team of 10 people including backend, frontend, mobile engineers, UX designer and QAs. The main team's area of responsibility was community features, end-users and content related stuff. I was in charge of the communication between developers and product manager, tasks management, mentoring, 1+1's, code quality and deployments.

As a software engineer I was responsible for features development and optimizations of different aspects of the application including database queries, http requests, tests and CI workflows. Key achievements:* Huge table data seed and migration with random data* Clickhouse integration* Caching optimization* Migration to Hotwire* Migration from Rails 5 to Rails 6* Migration from Ruby 2.5 to Ruby 2.7* Github Actions CI optimization: general time reduced from 20 minutes to 4-5 minutes

Was responsible for the backend, admin panel and microservices development for managing IoT devices like lockers, electric systems controllers, sensors, and so on. One of the most interesting tasks was a development of microservice in Go programming language for accepting thousands of events, filtering and preprocessing them on the fly and passing to RabbitMQ.

Responsible for the full-stack development of video interviewing web-platfrom for recruiters with Ruby on Rails and Vue.js. I was working on features like scheduling, recording, editing and sharing interviews.

I've been a part of integrations team responsible for the integration of 3rd party services like CRMs, Slack, Hangouts, Mailchimp, etc.

Member of New Business Initiatives team. Responsible for development and support of new company projects. Developed face recognition and verification system for online english test application in collaboration with Cambridge University.

As a full-stack developer I was responsible for different aspects of human resources SaaS:* Back-end features development with Ruby on Rails 4.2* Background jobs with Sidekiq* Search engines configuration (ElasticSearch, Solr)* Caching with Redis* REST API using ActiveModel serializer for JSON serialization* Database administration and stored procedures development for PostgreSQL* Front-end development with HAML, CoffeeScript, SASS and ReactJS with ES6* Bottlenecks identification and requests optimizationThe most interesting problems I faced with during the work for this company was development of very customizable table component on ReactJS with back-end module for settings management, ActiveModel serializer monkey patching for adding dynamic cache keys feature and requests for serialized data optimization.

Responsible for Internet of Things web-store development & design along with company management.It was just an experiment on local market. I tried to sell IoT devices for smart houses. Unfortunately it's closed due to lack of demand.* Ruby on Rails 4* PostgreSQL* ActiveAdmin* CoffeeScript, JQuery, Bootstrap, SASS

Responsible for corporative web-site transformation from PHP to Rails based project.* Ruby on Rails 3* MySQL* ActiveAdmin* CoffeeScript, SASS