Денис

DENYS KOYNASH
JAVA DEVELOPER

CONTACT INFORMATION:

Location: Kyiv, Ukraine
Phone: [открыть контакты](см. выше в блоке «контактная информация»)
Email: [открыть контакты](см. выше в блоке «контактная информация»)
Telegram: @koynashden
LinkedIn: [открыть контакты](см. выше в блоке «контактная информация»)
GitHub: https://github.com/KoynashDen

PROFESSIONAL SUMMARY:
A results-oriented software developer with solid experience in Java and the Spring ecosystem,
specializing in building reliable RESTful services. Skilled in both backend and frontend
development, always focused on improving my expertise and expanding my professional horizons.
I’m seeking opportunities to bring value to forward-thinking projects in Ukraine as well as on the
global stage.

TECHNICAL SKILLS:
• Programming Languages: Java, SQL
• Frameworks and Libraries: Spring Boot, Spring MVC, Spring Data, Spring Security,
Hibernate, JPA
• Databases: MySQL, PostgreSQL
• Development Tools: IntelliJ IDEA, Eclipse, Git, Maven
• Testing: JUnit, Mockito
• DevOps: Docker, GitLab CI/CD
• Web Technologies: HTTP, REST, HTML, CSS, JavaScript, React, React Native

LANGUAGES:
• English: Upper-Intermediate
• Ukrainian: Fluent

WORK EXPERIENCE:
Java Developer — Freelance
January 2025 – Present

Worked on several freelance projects focused on building full-stack web applications.
Designed and implemented Java backend services and integrated them with responsive React front-
end components.
Delivered reliable database solutions using MySQL and ensured stable persistence through
 Hibernate.
Improved project maintainability and team collaboration using Git and modern development
workflows.

Technologies: Java, Spring Framework, MySQL, React, IntelliJ IDEA, Hibernate, Git.

Java Trainee — EPAM
July 2025 – November 2025

Completed an intensive training program at EPAM, gaining hands-on experience with enterprise-
level development practices.
Studied and applied core OOP principles, UML modeling, multithreading, design patterns, and
database management.
Developed backend components using the Spring ecosystem (Spring Boot, Spring MVC, Spring
Security, Spring Data), focusing on clean architecture and scalable solutions.
Practiced version control workflows using Git, contributing to team-based projects and code
reviews.

Technologies: Java, Spring Boot, Spring MVC, Spring Security, Spring Data, MySQL, Git, UML.

PROJECTS:
MESSENGER

• Developed a Java-based backend for a messaging application, enabling real-time text
exchange and improving communication efficiency.

• GitHub: https://github.com/KoynashDen/messanger-BE
• Technologies: Java, Spring Framework, MySQL, WebSocket.
ZILKIT
• Developed a backend system for a lawyer’s client auditing platform, improving case
management and data tracking efficiency.
• GitHub: https://github.com/KoynashDen/Zilkit-BE

• Technologies: Java, Spring Boot, Spring Data JPA, Spring Security, MySQL.

EDUCATION:
Taras Shevchenko National University of Kyiv

• September 2024 – 2028
• Bachelor's degree: Computer Science(Applied Programming)