* Improved development culture in my team (simplified code review process, accelerated CI and fixed blinking tests, motivated junior developers to grow up, etc.).* Coordinated development of important tasks between several departments and improved communication between teams.* Redesigned several internal REST/GraphQL APIs.* Investigated and fixed performance problems with SQL queries and Ruby applications.

* Successfully completed integration with several blockchains and payment systems which increased customers revenue to several times.* Recreated administration panel for a digital currency exchange and made it simple, clear and fast.* Redesigned and migrated some exchanges to cheap infrastructure (reduced the cost of own by 80-90%)* Modernized several microservices and tools to improve and accelerate the development process

* Created ETL platform for processing and storing incoming events from mobile apps and video streamers. It collected data and generateddifferent kinds of reports about video watch sessions. At that time this system processed more than 10 000 events/sec and can be scaled up to1M events/sec or even more.* Together with team architected RESTful API server for SPB TV Rosing OTT/IPTV and Lebara Play OTT platforms.* Supported with creation a new infrastructure use Puppet, Docker, Team City, and some AWS services (EC2, ELB, Route 53, S3, RDS, ElastiCache),focusing on high-availability, fault tolerance, and auto-scaling.

* Designed and implemented REST API and admin panel for e-books mobile application with integrated shop for selling PDF, EPUB and interactivee-books.* Produced CMS and API for the Special K mobile application. It provided information about the Special K products, kept a record of consumedcalories, calculated BMI, etc.* Re-wrote Java server for embedded system to NIO and solved problems with packet loss, performance and integration with third-party systems.

Work in R&D department, implement software with partnership with Microsoft, by own initiative implement VS 2008-2010 extension to simplify development and deployment of SCOM Management Packs, etc.

Software development, manage test team, develop internal tools to simplify development and deployment, etc.