Work at Core Services team (Apple Services Engineering) on API development for Apple Podcasts, Music and TV.

Worked as a contractor at Google Play.

Playtika is a leading game developer in social casino space, developed online slots games - Slotomania and Caesars Slots.Designed and developed Messaging Service - a highload service (millions of users) that handles websocket connections and delivers messages from server to client with STOMP 1.2 protocol.Implemented analytics and metrics of message delivering stats (sent, acknowledged, delivery time, etc) for debugging and tracing integration issues with clients.Implemented message batching, compaction, broadcast and segmented broadcast.Designed and developed Goods Service - a facade with plugin architecture with main responsibility in rewarding users with mostly purchased items and reporting transactions to BI.Refactored Goods Service from monolith to microservices architecture (based on Spring Boot and Spring Cloud).Supported and resolved production incidents with Messaging and Goods Services.Environment: Java, Spring Boot, Spring Cloud, Netflix OSS (Feign, Hystrix, Ribbon, Eureka, Turbine, Zuul), Kafka, Camel, Zookeeper, RxJava, Couchbase, Maven, Gradle.Monitoring: AppDynamics, Grafana, Zabbix, ELK.

Knowably is the community for software engineers to discover books, courses, videos and articles. Founded Knowably and fully implemented frontend part and half of backend part, including integrations listed below and hosting in AWS.Responsible for product management, project management, UI/UX design, frontend and backend development, deployments.Environment: Java, Dropwizard, Spring (Core, AOP and Data), MongoDB, ElasticSearch, Amazon AWS (EC2, S3, SES, Cloudfront), REST API, LetsEncrypt, AngularJs, HTML5 & CSS3, Bootstrap, Bower, Grunt, NodeJs.Integrations: Embedly, Mandrill, Mailchimp, Facebook, Twitter, Intercom, Hotjar, Mixpanel, Google Analytics, Slack.

Playtech is the world's largest online gaming and sports betting software supplier.Designed and developed Playtech cross product engagement services - Loyalty System (unified loyalty points system) from scratch, Awards System (reward users if conditions were completed), Campaign Manager (marketing planning tool).In Team Leader role introduced Scrum process, code review practices, code quality standards, unit and integration testing.Designed APIs and implemented integrations with internal services.Managed a team, including interviewing, motivation, personal development plans, promotions, appraisals and bonuses.Analyzed business requirements and helped product owner with understanding costs of technical solutions.Environment: Java, Spring, Hazelcast, ElasticSearch, JMS, JAX-RS, Hibernate, MyBatis, Tomcat, Maven, Mercurial, Oracle.

Project: Financial reporting tool for State Street Bank.Designed, developed and refactored Cash Reconciliation Service, a tool to create reports and following reconciliation process), fixed performance, memory and concurrency issues.Performed huge SQL queries profiling and optimization.Implemented migration of accounts and permissions from multiple services to single database for following implementation of single sign-on for internal services.Environment: Java, Flex/AS3, BlazeDS, iBatis, Quartz, Sybase ASE, JasperReports, Apache POI, iText, Maven, Jenkins.

Softgenic Systems is a company focused on software development for commercial banks and non-banking financial organizations.Developed new UI by integrating Jide and ULC (Swing based components with data model on server side) for Loan Workbench product.Implemented built-in CMS based on JCR API to work with Alfresco or Jackrabbit.Environment: Java, Java Web Start, Swing, ULC, Jide, ComfyJ, BIRT, Spring, Hibernate, XML, XPath, JCR, Alfresco CMS, Jackrabbit.