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PROFESSIONAL EXPERIENCE
YAROSLAV December 2025 – February 2026
KYRSENKO TJHelpers
JAVA SOFTWARE ENGINEER Strong Junior Java Developer
Designed and maintained microservice-based backend
applications serving production workloads.
ABOUT ME Integrated external APIs and payment providers,
Java Backend Developer with 2 years of commercial ensuring secure and fault-tolerant communication.
experience building scalable microservice-based Implemented authentication and authorization flows
systems and RESTful APIs. Progressed from Junior to
using Spring Security, JWT, OAuth2, and Keycloak.
Strong Junior/Middle level through hands-on
experience in backend architecture, security Configured CI/CD pipelines and containerized
implementation, CI/CD setup, and mentoring. applications using Docker for consistent deployments.
Strong expertise in Spring Boot ecosystem,
Implemented cloud secret management using AWS and
PostgreSQL, secure authentication/authorization, and
automated testing. Focused on writing clean,
Google Cloud Secret Manager.
maintainable, production-ready code and improving Introduced monitoring and tracing with OpenTelemetry
system performance and reliability. and Prometheus to improve observability.
Improved code quality by enforcing SonarQube rules
and conducting peer code reviews.
SKILLS Mentored junior developers and helped onboard new
Programming Languages: team members.
Java Core, TypeScript, JavaScript Developed and maintained automated API and UI tests.
Backend & Frameworks:
Spring Boot, Spring MVC, Hibernate, JPA
MARCH 2024 – DECEMBER 2025
Architecture & Design:
TJHELPERS
Microservices, REST API design,
Clean Architecture principle, OOP, SOLID JUNIOR JAVA DEVELOPER
Databases & Caching Developed RESTful APIs using Spring Boot following
PostgreSQL, MySQL, H2, Redis clean architecture principles.
Security: Designed service-layer logic with proper validation,
JWT, OAuth2, Keycloak, Hashing exception handling, and transaction management.
algorithms
Integrated PostgreSQL using Hibernate/JPA and
Testing:
optimized database queries.
JUnit, Mockito, TestNG, Selenium,
Playwright, Allure
Contributed to security implementation using Spring
DevOps & Tools: Security and JWT.
Docker, CI/CD, Git, Maven, Gradle, Wrote unit and integration tests using JUnit and
Postman, Mockito.
OpenAPI/Swagger Participated in Agile ceremonies and collaborative
Cloud:
development workflows.
AWS, Google Cloud
Implemented automated UI testing using Selenium and
Playwright.
Languages:
Ukrainian — Native
English — B2 EDUCATION
State University of Information and
CONTACT Communication Technology
(+380) 68 874 49 12 2023 - 2027
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Linkedin
GitHub
COURSES
Udemy - Java courses , Spring boot courses