Kristina Oleinik Email and Phone Number

Participated in the development of a custom electronic document managementapplication (similar to Google Drive) with multi-module structure - web and desktopclients.● Implemented the authentication and authorization process with SpringSecurity and JWT● Developed a robust locking system for personal directories, ensuring dataintegrity and preventing concurrent access conflicts.● Increased the client acquisition by 50% by offering a secure storage solutionfor sensitive data without depending on third-parties’ services● Performed 80% of test coverage by designing and implementingcomprehensive test suites● Stack: Java 11, Spring Boot, Postgres, Docker, Elasticsearch, Redis, Sonar, Git,Jenkins, JUnit, MockitoDeveloped an Employee Engagement Platform - a web application that helps toimprove an employee satisfaction, provides communication, feedback sharing,loyalty program and allows to manage vacation dates.● Worked on a survey system (e.g. to choose the best presentation of theconference, a place for the next team building, etc)● Achieved 34% increase in employee engagement by implementing amotivation system via internal company’s currency and fixing existing bugs, which significantly improved user experience● Stack: Java 11, Spring, Hibernate, Postgres, Git, Jenkins, Docker, JUnit,Mockito

Participated in a development of microservice-based web application for buildinganalytical financial reports and validating/establishing the individual investors’ statusfor stock exchanges.● Was involved in the complete development cycle of the web application,which included planning tasks, designing, implementing, unit testing,deploying, refactoring, and fixing existing issues● Increased reports generation efficiency by 75% through the implementationof index building and DB queries optimization● Collaborated with a team of financial analysts to implement stress- andback-testing scenarios and ensure accurate risk assessment.● Decreased average waiting time for investor’s status issue from 5 to 2 daysby optimizing the workflow and consolidating all data validation checks into asingle efficient module● Stack: Java 11, Spring Boot, Spring JDBC, Oracle, Kafka, Docker, Git, GitLab CI,JUnit, Mockito