Андрій

ANDRII HORDIIENKO Junior Java Developer
Ukraine | [открыть контакты](см. выше в блоке «контактная информация») | [открыть контакты](см. выше в блоке «контактная информация») | Linkedln | Github | Telegram : @AndriiHordiienko

PROFESSIONAL SUMMARY
Junior Java Developer with 6+ months of commercial experience and a strong background in building backend
web applications using Java and Spring Boot. Worked on backend logic for web applications: designed REST APIs,
implemented authentication and authorization, and integrated relational databases. Comfortable with Git-based
workflows and writing unit and integration tests. Looking for a junior position with mentoring and code review to
grow as a backend developer

TECHNICAL SKILLS
Languages: Java 17/21
Frameworks & Libraries: Spring Boot 3, Spring Security, Spring Data JPA, Hibernate, Spring Cloud
Databases: MySQL, PostgreSQL, Redis, Liquibase
Architecture & Design: RESTful API, OOP, SOLID, Microservices Architecture, Design Patterns, Service
Orchestration
Tools: Git, Docker, Gradle/Maven, Apache Kafka, OpenAPI (Swagger)
Testing: JUnit, Mockito, Integration Testing
Methodologies: Agile (Scrum, Kanban), Jira

WORK EXPERIENCE
Backend Developer WinWin.travel (Remote) DEC 2025 - Present
Developed and maintained “OpenAI Converter" integration module, designing REST APIs to aggregate diverse
data streams (reviews, meta policies, website content) from multiple databases into a unified processing
system.
Optimized a heavy data processing pipeline by implementing multithreading. Successfully reduced execution
time for OpenAI requests from 20+ hours to under an hour.
Improved backend architecture maintainability by implementing the Strategy design pattern, ensuring clean
and extensible code for parsing various incoming data formats.
Streamlined the deployment process by containerizing applications with Docker and monitoring pod health,
logs, and resources in a Kubernetes environment using Lens.
Took ownership of backend Release Management, resolving complex Git merge conflicts and synchronizing
Liquibase changelogs to ensure safe database migrations and stable CI/CD pipeline executions.
Secured business logic reliability by writing comprehensive unit and integration tests (JUnit, Mockito).

PROJECTS
Financial System — Microservices Backend Application
Developed a microservices-based financial platform with JWT authentication and robust transaction
orchestration using the SAGA pattern, idempotency, and retry mechanisms.
Implemented core business logic (multi-currency support, limit validations) and integrated Redis, ensuring
reliability through comprehensive unit, integration, and security testing.
ToDo-Management — Task management application
Developed RESTful API backend for task management with comprehensive CRUD operations, business data
validation, and high test coverage using JUnit and Mockito.
MatchMaker — Dating Platform Backend
Built a RESTful backend featuring a complex matching algorithm based on 10+ configurable parameters and a
real-time chat system.

EDUCATION
Bachelor of Computer Science Kharkiv National University of Radioelectronics 2021-2025

LANGUAGES CERTIFICATIONS & COURSES
Ukrainian: Native Designing High-Load Data Storage Systems, Wildau-Kharkiv IT Bridge (2023)
English: B1 (Intermediate) Software Systems Design Methodologies(Agile), Wildau-Kharkiv IT Bridge (2023)
Java Backend Development (Spring Boot), Hyperskill (2025)