Backend Development

• Java 8/11/17– Java Core, OOP, Multithreading, Collections, Java Enterprise
• Spring Framework: Spring Core, Spring Boot, Spring Web, Spring Data Annotation-based configuration Environment-specific profiles (Dev / Test / Prod)
• REST & SOAP – design, implementation, integration
• Data Persistence: JPA, Hibernate, Querydsl, MyBatis
• Databases: SQL, MySQL, PostgressSQL, MongoDB
• Formats: JSON, XML/XSD (serialization, validation)
• Testing: JUnit, Mockito (service-level test coverage)
• API Documentation: Swagger (Zalando standard)
• Code quality & productivity tools: Lombok, MapStruct
• Security: oAuth, JWT - Developed and implemented a stateless authentication system using Spring Security and JWT with token rotation, ensuring secure REST API access for web and mobile clients while mitigating XSS/CSRF risks

Message Brokers / Integration

• Kafka – producing, consuming, managing message queues
• RabbitMQ – message-based communication; Spring integration
• IBM MQ – ESQ/XSD schemes, message validation, reliable delivery

Frontend Development (Secondary – Full-Stack Capabilities)

• Angular, TypeScript – creating and supporting UI pages
• JavaFX - create view model for aplication
• Thymeleaf – server-side HTML rendering
• JavaScript – practical usage with Corezoid logic
• HTML, CSS – UI debugging, rendering in pipeline

CI/CD & Development Tool

• Git — branching strategies, conflict resolution, team collaboration
• Maven — build lifecycle and dependency management
• Jenkins, RunDeck, NXRepo — CI/CD pipelines and deployments
• JIRA — task tracking and Agile workflow
• Familiarity with Docker, Kubernetes
• Familiarity with GNU/Linux environments
• Familiarity with ELK stack (log analysis and monitoring)