Performed integration with an external system that operates with Order calculation including prices and promotions via rest client;Implemented scheduling services (cron jobs) for email reports and clean up outdated data (Quartz integration);Performed technical improvements:Migrated JPA provider - EclipseLink to Hibernate;Migrated custom DI mechanism to Spring Context and Transactional (including integration tests to Spring Test);Migrated DB migration tool - Flyway to Liquibase (that uses patching mechanism instead of versioning and supports multiple branches);Performed performance improvements:Integrated Hazelcast caching;Migrated JPA queries to native;Several performance troubleshooting of SQL queriesImplemented microservice from scratch;Developed tool for NoSQL DB migration (Firestore DB);Participated in development of tool for reliable distributed transactionsTeam: Dev Team - 9 members, QA Team - 6 membersDatabase: Oracle, MariaDB, GCP: Cloud Spanner (relational), Firestore (NoSQL)Tools: Ant, Maven, IntelliJ IDEA, Git, Bitbucket, GerritTesting: JUnit, Mockito, Spring Test, JMeter, SpockProcess: Jenkins, Sonar, Jira, Confluence, SwaggerHub, GCPTechnologies: Java, Spring Core, JDBC, MVC; Hibernate, Spring Cloud, Google Cloud Platform, Spring Boot (on Apache Tomcat), Docker

Developed REST services for order management and customer configuration in Hybris. Developed REST Services for systems communication for full order flow on Terminal.Dev Team: 5 membersDatabase: OracleTools: Ant, JMeter, Maven, Docker, VagrantTechnologies: Hybris, Java, Spring Core, Spring WS, Spring MVC, Spring Integration