Андрій

ANDRII HORDIIENKO Java Backend Developer
Ukraine | [open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Linkedln | Github | Telegram : @AndriiHordiienko

PROFESSIONAL SUMMARY
Java Backend Developer with a solid foundation in building web applications and a proven track record of
commercial development. Experienced in designing REST APIs, optimizing heavy data pipelines, and
implementing microservices architecture. Well-versed in infrastructure tools including Docker and Kubernetes, as
well as distributed messaging with Apache Kafka. Adept at database management with PostgreSQL and writing
unit/integration tests to ensure high code quality. Fast learner with a results-oriented mindset, seeking a position
to solve challenging tasks and actively contribute to team goals.

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) JAN 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.

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)