Roman Kostenko Email & Phone Number

Kyiv, Ua

Kyiv, Kyiv City, Ukraine

[Energy domain]Developed an application for an energy company to collect, process, analyze and visualize large volumes of complex data. The system was based on a microservices architecture, with numerous microservices working together to handle the complexity of the energy sector's data management needs.Key Responsibilities- Bug Fixing: Identified and resolved bugs across a large codebase, ensuring the reliability and stability of the system;- Feature Implementation: Implemented new features and made improvements, not only in Java but across the system, to solve business problems;- Git Management: Organized the team to create and implement a Git strategy to support multiple release strategies, ensuring smooth and efficient code versioning and collaboration;- Automation: Created Python scripts and complex Excel tables to collect and visualize real-time project-related data, improving efficiency and decision-making processes;Technologies:Java core (Java Collections, Java 8, Java 11, Java 17, Multithreading), Spring (MVC, Data, Security, AOP, Retry, Validation), Hibernate/JDBC, SQL (Postgres), Keycloak, Kafka/Rabbit MQ, Testing (JUnit, JUnit5, Mockito), Azure Blob Storage, Linux, Kubernates, Docker, Nodred, Python/Excel

Kyiv, Kyiv City, Ukraine

[Networking Domain, R&D]Developed a network topology creation system based on a microservices architecture. The main goal of the project was to design and implement a solution for visualizing and managing complex network topologies.Key Responsibilities- Java Development: Added new endpoints and refactored existing code to enhance functionality and maintain code quality;- Topology Design: Developed algorithms and methodologies for creating and visualizing network topologies. Utilized switch-router troubleshooting interfaces to collect accurate topology data;- Code Review and Testing: Conducted code reviews to ensure best practices and coding standards. Ensured all new code was covered by unit tests using JUnit and Mockito.Technologies:Java core (Java Collections, Java 8, Java 11), Spring (MVC, Data, Security, AOP, Retry), Rabbit MQ, SQL (Postgres), Testing (JUnit, JUnit5, Mockito), Networking

Kyiv, Kyiv City, Ukraine

[Networking Domain]Developed a microservices-based network management system designed to collect, validate, process, and standardize large volumes of network data from different sources. The primary goal of the project was to gather real-time statistics by collecting network data from various devices and systems.The system also included a Power BI component for advanced data visualization and reporting, enabling stakeholders to make informed decisions based on real-time insights.Key Responsibilities- Java Development: Added new endpoints and refactored existing code to enhance functionality and maintain code quality;- Integration with Different Data Sources: Extended the system’s capabilities by integrating and supporting new sources of network data;- Code Review and Testing: Conducted code reviews to ensure best practices and coding standards. Ensured all new code was covered by unit tests using JUnit and Mockito;- Documentation: Developed comprehensive and high-detailed documentation for the system, including architecture diagrams and API specifications;- Integration with Power BI: Created and modified interactive dashboards on Power BI based on the standardized and generated reports.Technologies:- Java core (Java Collections, Java 8, Java 11, Multithreading); Spring (MVC, Data, Security, AOP, Retry, Validation), SQL (Postgres, Athena), S3, Testing (JUnit, JUnit5, Mockito), Power Bi

Kyiv, Kyiv City, Ukraine

[Mentoring]Served as a mentor on 2 Java Beginner courses, teaching students about core Java concepts, Java Collections, and Git version control. My role involved guiding students through their learning journey, providing feedback, and supporting their project development.Key Responsibilities- Teaching: Delivered lessons on Java Collections, Java core, and Git, ensuring students grasped key programming concepts and best practices;- Homework Review: Reviewed and provided feedback on student assignments and projects to help them improve their coding skills;- Webinars: Created and hosted webinars on advanced topics, clarifying complex concepts and answering questions in real-time;- Project Evaluation: Assessed student course projects, ensuring they met quality standards and provided insights for further improvement;- Student Support: Responded to student questions, helping them overcome challenges and gain confidence in their abilities;Technologies:Java: Java Collections, Java Core Tools: Git Mentoring Tools: Webinars, homework review, project evaluation

Bachelor Of Education - Bed, Computer Science

Education record