• Optimized database queries in the payment service, resulting in a 30% reduction in query execution time, decreasing from 6 seconds to 4.2 seconds, which improved overall system performance• Developed reusable libraries with shared models and utility methods, reducing code duplication by 25% and accelerating development time by 15%• Integrated a 3D Secure 2.0 service using a vendor solution, enhancing transaction security and reducing fraudulent transactions by 20%• Developed a robust data storage service using Apache Camel and RabbitMQ, ensuring data integrity and system stability, resulting in approximately zero data loss during infrastructure failure%• Onboarded and mentored new team members, facilitating their integration into the development team

• Developed a robust service based on RingBuffer (Disruptor) technology to ensure consistent handling time for elements up to 20 ms, circumventing JVM "Stop the world" scenarios and ensuring continuous, efficient operation9• Designed and launched an advanced incident resolution system, automating issue detection and resolution processes to significantly decrease downtime and enhance system resilience. Reduced the number of incidents by 30%, which improved the work of technical support• Resolved issues with unit tests and increased the testing coverage to over 87%, ensuring a more stable and reliable application• Successfully migrated legacy banking systems to modern microservices architecture, reducing system downtime and maintenance costs by 15%

As a Java Developer at NewTest, I am actively involved in developing the engine of a search aggregator aimed at providing better offers for tourists. Utilizing technologies such as JHipster, Java 8, MySQL, Docker, JUnit, Elasticsearch, and Spring Boot, I contribute to various aspects of the project.My responsibilities include building REST services for the search aggregator, ensuring efficient communication and data retrieval for optimal user experience. I also participate in creating the architecture of the application and database, designing scalable and maintainable solutions.Throughout the development lifecycle, I develop, test, implement, and maintain the application software, following industry best practices. This includes writing clean and robust code, conducting thorough testing, and debugging to ensure the reliability and performance of the search aggregator.I am dedicated to delivering a high-quality search aggregator while continuously improving my skills and knowledge in Java development and related technologies.

As a Java Developer at SiriusSystem, I have gained valuable experience in developing a business CRM system using Java 8, MySQL, and JDBC. Throughout my time at the company, I have been actively involved in all phases of the development lifecycle.My responsibilities include designing and implementing various features and functionalities within the CRM system. I contribute to the software analysis, programming, testing, and debugging processes to ensure the quality and performance of the application.Moreover, I work diligently to develop, test, implement, and maintain the application software, utilizing my expertise in Java, MySQL, and JDBC. By leveraging these technologies, I ensure the seamless integration and efficient management of business data within the CRM system.At SiriusSystem, I actively contribute to streamlining the development process, adhering to best practices, and ensuring clean and maintainable code. I am dedicated to continuously enhancing my skills and knowledge as a Java Developer while delivering a high-quality CRM system for our clients.