Ілля

Illia Korsun
Junior Java Backend Developer
Katowice, Poland | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | github.com/obvly

PROFESSIONAL
SUMMARY
Backend-focused Junior Java Developer with hands-on experience building REST APIs using Java, Spring Boot,
Spring Security, JPA/Hibernate, and SQL. Completed 500+ hours of intensive Java backend training and
developed project-based solutions featuring authentication, database migrations, testing, and Docker. Focused on
clean, maintainable, well-tested code and eager to contribute to production-grade backend services.

TECHNICAL SKILLS
Programming & Core Concepts Java 17/21 • SQL • OOP • SOLID • Design Patterns
Frameworks & Libraries Spring Boot • Spring MVC • Spring Data JPA • Spring Security • Hibernate • JDBC
Databases & Migrations MySQL • PostgreSQL • Liquibase • Flyway
Testing & Tools JUnit 5 • Mockito • Postman • Swagger/OpenAPI • Maven • Git • GitHub
DevOps & Environment Docker • Linux/Unix basics • IntelliJ IDEA

PROJECTS
Online Bookstore REST API 2025
• Built a secure e-commerce backend using Spring Boot, Spring Security (JWT), and Hibernate/JPA.
• Implemented authentication, RBAC, shopping cart, order processing, and payment status tracking.
• Designed a normalized MySQL schema and managed migrations with Liquibase.
• Documented endpoints with Swagger/OpenAPI and tested them with Postman.
Task & Workflow Management System 2025
• Developed a task tracking application supporting team collaboration, task assignment, status updates, and deadlines.
• Used Spring Data JPA and MySQL for persistence and efficient query handling.
• Containerized the application with Docker for consistent local development and deployment.
Cinema / Event Ticket Booking API 2025
• Built a RESTful booking service for seat reservations and session scheduling.
• Applied validation layers and robust error handling with Spring MVC.
• Designed the service to reduce booking conflicts during concurrent user actions.

TRAINING
Java Developer Trainee — Mate Academy 2025 – 2026
• Completed 500+ hours of hands-on Java backend development.
• Worked with REST services, Spring ecosystem tools, testing, Git workflows, and Agile/Scrum practices.

EDUCATION
Bukovinian University — Chernivtsi, Ukraine 2025 – Present
BSc in Software Engineering

LANGUAGES
Ukrainian — Native | Russian — Native | English — C1 | Polish — B1