Ruslan

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RUSLAN CHERNIAVSKYI
[відкрити контакти](див. вище в блоці «контактна інформація»)
Java Backend Developer
Odesa, Ukraine
Java Backend Developer with 3+ years of
commercial experience developing Telegram
microservices and business-critical backend
systems. Currently working with Java 21, LinkedIn
Spring WebFlux, PostgreSQL and cloud
integrations. Open to mid backend roles. Github

SKILLS
Core Technologies: Java 17/21, Spring Boot, Spring Security, Spring Data JPA, Spring WebFlux, Hibernate, JDBC
Databases: PostgreSQL, MySQL, MongoDB, Redis

Messaging & Integration:Kafka, REST API, WebSockets
Testing: JUnit 5, Mockito, Testcontainers
DevOps & Tools: Docker, GitHub Actions, CI/CD, Liquibase, AWS S3
Development Tools: Git, IntelliJ IDEA, Postman, Jira

WORK EXPERIENCE
Middle Java Developer
Quality over quantity (retail/e-commerce)
11/2025 – Present

Backend development for a commercial retail and loyalty platform serving order processing, payments, CRM
synchronization, and customer notifications.

Key Achievements
Developed and maintained backend services responsible for order lifecycle management and payment processing.
Integrated Monobank payment gateway and KeyCRM order management platform using Spring WebFlux and
WebClient.
Reduced manual order processing by automating CRM synchronization and SMS notifications.
Designed and implemented media upload pipeline with validation and AWS S3 storage integration.
Established Liquibase-based migration workflow for safer database schema updates.
Implemented soft-delete functionality using Hibernate annotations.
Increased application reliability through comprehensive integration testing using JUnit and Testcontainers.
Participated in code reviews and CI/CD improvements using GitHub Actions.

Tech Stack
Java 21, Spring Boot, Spring WebFlux, PostgreSQL, Hibernate, Redis, AWS S3, Liquibase, Docker, GitHub Actions, JUnit,
Testcontainers

Java Developer
EPAM Systems
07/2024 – 10/2025

Key Achievements
Designed and maintained 5+ microservices for an enterprise logistics platform serving 50k+ daily requests.
Developed RESTful APIs for data exchange between distributed services.
Optimised database queries - cut response time by up to 25% on the hottest endpoints.
Created unit and integration tests to keep production releases stable.
Worked with cross-functional teams using Git, Docker and CI/CD pipelines.
Responsible for service development, performance analytics, and integration with third-party API and DB.
Developed event-driven communication using Kafka producers and consumers.

Tech Stack
Java, Spring Boot, PostgreSQL, Docker, Git, CI/CD, JUnit, REST API
Java Developer
NDA
02/2023 – 05/2024

Key Achievements
Developed REST APIs and event-driven integrations.
Implemented asynchronous processing for resource-intensive operations.
Improved order update and delivery workflows, increasing operational efficiency.
Participated in architectural discussions and technical design decisions.

Tech Stack
Java, Spring Boot, Hibernate, PostgreSQL, Docker, REST, JUnit, Maven

EDUCATION
Specialist of Computer Systems and Networks
ODESA NATIONAL POLYTECHNIC UNIVERSITY

PROJECTS
BookNest - Book Management REST API.
Spring Boot, Spring Security, PostgreSQL, Hibernate
Implemented role-based access control, request validation, and CRUD APIs for book and order management.

StayEase - Property Booking Service.
Spring Boot, PostgreSQL, Liquibase, REST API
Built APIs for property listings, reservations, authentication, and database migration management.

ADDITIONAL EDUCATION
Java course at Mate academy (OOP, Java 8+, Spring, Hibernate)

LANGUAGES

Ukrainian English German
Native Upper-Intermediate (B2) Basic (A1/A2)