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- Owned the vision, design, and delivery of a logic-heavy Transportation Management System within Java microservices ecosystem for the company's top 2 clients (S&P 500)- Full life cycle experience including requirements gathering, business analysis, system architecture, high-level design, software architecture, detailed design, data design, coding, testing, and creation of functional documentation- Defined and owned deployment pipeline and support process for defects across 5 engineers resulted in increase in delivery speed by 70% and expedited client expansion from 2 to 30+ countries- Configured local environment to support distributed deployment, resulted in reduction in debugging time by 80% using Docker, RabbitMQ and Tomcat- Implemented Depth First Search Graph traversal algorithm for frequently used, customer-facing logic resulted in UI loading time reduction of 95% using JS, React, Redux- Redesigned a CSV parser to optimize memory management (min. 6M rows) for company’s largest customer- Optimized heavy backend requests using CPU Profiler, reduced user waiting time up to 30%- Advocated for continual engineering improvements: constant refactoring, coding for testability, low-friction check-ins, and build system improvements

- Developed and architected infrastructure improvement for over 20 microservices in Java with Spring framework- Identified and made critical fix in subscription payment validation logic resulted in potential several hundred thousands dollars saving from unauthorized subscriptions- Overhauled deployment pipelines and shipping process, implemented shared Jenkins library for - OpenShift using Groovy which reduced codebase by 80% and manual configuration by 50%, and increased build stability- Integrated code convention with mandatory checkstyle on build time, resulting in significantly improved code readability and reduced average code review time by 20%- Improved system stability by eliminating “dependency version hell” using Maven Enforcer plugin, resulted in reduction in debugging time by 30%Environment: Java, Groovy, Spring Boot, Spring MVC, Spring Data, JPA, Swagger, Microservices, Web Services, JS, TypeScript, Angular, Jenkins, Jboss, Docker, OpenShift, Linux, RHEL, RPM

Developed web applications and improved infrastructure for continuous integration and continuous development (CI/CD) team which globally provides services such as Artifactory, Jenkins, SonarQube for over than 500 engineering teams. The infrastructure consists of more than 400 servers.Implemented infrastructure solutions for worldwide provision of CI/CD services for over 500 engineering teams- Redesigned a customer-facing web application - secured API endpoints, separated logic into MVC pattern, converted RPC to RESTful, added thread-safety, increased unit-test coverage from 8% to 67%- Deployed a log collection cluster using ELK stack (ElasticSearch, Logstash, Kibana), Docker and custom Log4j adapter, reducing debugging time by 20%Environment: Java, Groovy, Spring Data, Spring Boot, Spring Cloud, JPA, Liquibase, Microservices, Web Services, ElasticSearch, JS, Angular, Docker, Rancher, Puppet, Ansible, RHEL, RPM, HAProxy, Terraform, AWS

Responsible for performance tuning, integration test, capacity test for the infrastructure supporting online gaming application with 3M active paying users- Enabled customers to confidently use 30% more functionality by reproducing a complex bug appeared only on multi-node Java + Cassandra DB clusters under heavy load and deployed a critical fix using HTTP stress tests- Analyzed the main SQL DB schema and refactored a statistics module to reduce DB partition by 25%Environment: Java, JSP, Maven, Intellij IDEA, Linux, Cassandra, Kryo, JAX-WS, REST, SOAP, SVN, XStream, JUnit, Mockito, XML, JSON, Tomcat, Jetty, Struts, HTML, JavaScript, Ajax.

Designed, implemented and tested 2 user interfaces using Windows Forms and C#, resulted in 200% improvement in data analysis speed, extending coverage from 20% to 90% of testsEnvironment: .Net 4.0, C#, WinForm, DevExpress, NUnit, UML, SVN, Redmine, TeamCity.