Key Accomplishments:✓Leading Ruby on Rails developer at German based health tech company, with more than 400 000 active users. Developed new mobile API for their new React native mobile app. Integrated AI backed consultant for customers.✓Developed from scratch a mobile API and web API for managing parkings both customer and owner side. Had daily active 500 000 users and no 500 error in the first 6 months after launch. Used Ruby on Rails, Postgresql and GraphQL for this.✓Contributed to development of chat and networking platform that helps to manage, grow and connect communities through messaging, content and discovery. The project was developed using Ruby on Rails, PostgreSQL and Backbone.js.

In charge of breaking the existing 5 year old monolith Rails app into a bunch of microservices, building new apps working with data pipeline, managing a multicultural team in different timezones. Key accomplishments:✓ Implemented a new approach of developing Rails applications, which led to increased 30% speed of delivering features. ✓ Added a new paradigm of development which was inspired from monads concept issued from functional programming which gave us performance and made us write 40% less code.✓ Optimized SQL queries which increased by 75% the time of long calculations.

In this private trading company the primary task was to first build the Proof of Concept, which in its turn will prove that the desired idea of crypto arbitrage it’s possible and profitable. After developing an app using Python which gathered data from various crypto exchanges APIs and was building a graph, and then, was running the Bellman-Ford algorithm to detect negative cycles which represented the possibility of arbitrage. After the PoC was considered successful a complete system was built, which managed itself to the company's deposit and automatically traded on crypto exchanges. Key accomplishments:✓ Assembled data from various crypto exchanges APIs into graphs which increased the number of trades by 300%.✓ Implemented Bellman-Ford algorithm and this led to 40% profit gain.✓ Automated trading saved 20% of the budget.

My responsabilities included assuming the migration of sites frontend from jquery to newangularjs, also they included optimizing backend code, and adding new features and newtype of users which involved customizing devise gem.

Added new functionalities, customized gems, wrote specs, frontend tests(capybara webkit),improved precompiling assets system.