Віталій

VITALIY DATSENKO
Email: [open contact info](look above in the "contact info" section) | Phone: [open contact info](look above in the "contact info" section)

LinkedIn: [open contact info](look above in the "contact info" section) | GitHub: github.com/Jokail
Location: Kyiv, Ukraine | Available for remote work

ABOUT ME
Junior Backend Developer with 2 years of programming experience. Built a
production-ready project: electronic gradebook management system (1000+ active
users) and maintained the backend of a military institute's official website. Proficient in
Java backend development, React frontend, and modern DevOps practices. Actively
seeking a first commercial junior developer position for professional growth in a team of
experienced professionals.

TECHNICAL SKILLS
Backend: Java 17, Spring Boot 3, Spring Security, Hibernate JPA, REST API
Frontend: JavaScript, TypeScript, React 18/19, MobX, Tailwind CSS
Database: PostgreSQL, Liquibase
Authentication: OAuth2, JWT, Keycloak
DevOps: Docker, Docker Compose, Nginx, Git, Maven
Testing: JUnit 5, Testcontainers
Tools: IntelliJ IDEA, VS Code, Postman, Git

WORK EXPERIENCE
Backend Developer | Official Institute Website Maintenance
MITIT named after Heroes of Kruty | 4 months | Team of 5
https://mitit.mil.gov.ua | 10,000+ visitors/month
Maintained and updated backend, ensuring public site stability.
Tech Stack: Java, Spring Boot, Maven
Key Responsibilities:
•​ Fixed critical bugs and optimized backend performance
•​ Updated and maintained existing functionality
•​ Ensured uninterrupted website operation for thousands of visitors
•​ Team collaboration with 5 developers using Git workflow

Junior Full-Stack Developer | Electronic Gradebook System
MITI | 8 months | Team of 7
Production system | 1000+ active users
Developed and deployed a comprehensive electronic gradebook management system
serving over 1000 active users in production. The system is actively used in the
institute's educational process.
Tech Stack: Java 17, Spring Boot 3, PostgreSQL, React 19, TypeScript, Docker,
Keycloak
Backend Contributions:
•​ Implemented REST API with 6+ controllers serving over 1000 daily active users
•​ Built OAuth2/JWT authentication system with Keycloak integration supporting 6
different user roles
•​ Configured caching with Caffeine for performance optimization
•​ Wrote comprehensive test suite with JUnit 5 and Testcontainers
Frontend Contributions:
•​ Created an interactive gradebook interface with real-time grade entry
•​ Developed an admin panel for user management and institutional data
Impact: The system processes over 5000 grade entries monthly. Worked in a team of 7
developers using Git workflow, code reviews, and agile sprints.

EDUCATION
Military Institute of Telecommunication and Information Technologies named after
Heroes of Kruty
Bachelor of Computer Information Technologies | Graduation: June 2025
Kyiv, Ukraine

LANGUAGES
Ukrainian — Native
English — B1
Russian — Fluent

TECHNICAL PREPAREDNESS
•​ Ready for technical interviews: algorithms, data structures, design patterns
•​ Familiar with: System Design fundamentals, CI/CD concepts, Agile
methodologies