Dec 2015 – Jun 2018 · 2 yrs 6 mos · Los Gatos, CA

• Worked on multiple projects, including monolith to microservices migration, helping to scale billing projects to 20 million active users and serve partners like Hulu, Sling and Netflix:
• evaluated different container orchestration tools (AWS ECS, Kubernetes), set up a CI/CD infrastructure for the billing team
• implemented "infrastructure as code" process - from evangelizing the concept to to automating AWS resource provisioning, empowering developers and cutting lead time for infrastructure provisioning from days to minutes
• worked on a set of billing microservices - from architecture to implementation to load testing/performance tuning. Achieved 5x throughput increase for partner-facing services (by optimizing garbage collection/thread pools). Implemented a fully reactive solution (RxJava/Spring Boot) to deal with issues caused by partners' high latency. Implemented double-billing prevention service
• provided technical leadership/mentoring to a team of offshore contractors

Oct 2012 – Dec 2015 · 3 yrs 2 mos · Mountain View, CA

• Wore multiple hats, designing, implementing and leading various projects, including:
• Backend services for Tango games, including RoadRiot (#1 Racing game according to AppAnnie, 20 millions downloads, top 120 grossing game in the US, 12 million dollars in revenue, 3 billion games played), helped to scale it from zero to more that 1 million of daily active users.
• Java monitoring framework, which collected performance metrics from webapps running on 1000+ VMs and bare-metal servers to provide OPS team visibility into day-to-day performance.
• Improved Tango testing practices, introduced the concept of mutation testing (eventually bringing REAL testing coverage to 90%+ and reducing test runtimes by 250-400% for participating projects); developed centralized test result reporting & monitoring system.
• Game spam reduction system (evaluating daily user activities and filtering out non-gamers from the list of potential recipients, total daily volume: ~200-300 million decisions).

Oct 2003 – Oct 2012 · 9 yrs · Lugansk, Ukraine

• Wore multiple hats, leading a number of projects, including:
• Distributed data collection/analysis application for Trans-Agentstvo (one of the country’s largest metal-trading companies):
• Designed and implemented an asynchronous distributed architecture for high-volume data-exchange between geographically distributed branches and headquarters. Performed performance analysis and optimization (including database structure and queries optimization), achieved 50-70% performance increase. Provided mentoring for customer’s personnel and other engineers.
• B2B portal for the TIR-Lugansk (heavy-machinery spare parts dealers):
• Designed and developed Web services for data exchange with a customer’s legacy system and 3-rd party systems. Performed the performance analysis and optimization, achieving 400-600% performance increase, eliminating the legacy system’s data exchange bottlenecks. Oversaw migration to the new servers, resolving the software compatibility/licensing issues, saving up to 30% in licenses’ cost.

Feb 2001 – Aug 2003 · 2 yrs 6 mos · Donetsk, Ukraine

• Developed a water metering and billing system for a New York-based company, performed load-testing to ensure high availability
• Developed and maintained jewishmusic.com (one of the largest online stores of ethnic Jewish music and books), including database maintenance/performance tuning.

Jan 1999 – Nov 2000 · 1 yr 10 mos · Donetsk, Ukraine

• Developed the database and back-end services for online auction/management system for sports' programming rights for more than 120 countries.