Особисті дані приховані

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Lviv, Ukraine
Linkedin Denys Sych [відкрити контакти](див. вище в блоці «контактна інформація»)
GitHub Java Backend Developer
Motivated Java Software Engineer with 1 year of hands-on experience designing scalable RESTful APIs and
distributed backend systems. Proficient in the Java ecosystem—specifically Spring Boot and Spring Cloud—I bring a
solid understanding of both modular monoliths and microservice architectures. I am focused on building reliable backend
systems, improving system performance, and writing clean, maintainable code.
Projects | Experience
Banking REST API (GitHub) | Ongoing
• Tech Stack: Java 17, Spring Boot, Spring Cloud, Apache Kafka, Resilience4j, Micrometer, Zipkin, PostgreSQL,
Flyway, Docker.
• Designed and implemented a microservices-based banking system using Spring Cloud (Eureka, Config Server),
containerized with Docker, and provisioned an AWS EC2 instance with Amazon RDS for staging deployment.
• Used Apache Kafka for asynchronous communication between services to ensure eventual consistency of
transactions.
• Implemented fault tolerance using Resilience4j (circuit breakers, retries) to handle service failures.
• Integrated distributed tracing with Zipkin and metrics collection using Micrometer for monitoring system
behavior and automated database schema migrations using Flyway.
• Configured a CI/CD pipeline via GitHub Actions for automated build testing, and documented all endpoints
using Swagger/OpenAPI.
Enterprise Book Store Service (GitHub) | 12.2025 - 02.2026
• Tech Stack: Java 17, Spring Boot, Spring Security (JWT), Spring Data JPA, PostgreSQL, JUnit 5, Mockito.
• Secure Architecture: Developed a secure, stateless MVC Web Application using Spring Boot 3 and Spring
Security, implementing JWT authentication and Role-Based Access Control (RBAC).
• Performance Optimization: Diagnosed and resolved Hibernate N+1 problems using @EntityGraph, optimizing
complex data retrieval to successfully handle 200+ concurrent requests with sub-100ms response times during
local load testing.
• DevOps & Quality: Containerized the database with Docker Compose for consistent environments and
implemented global exception handling via @ControllerAdvice.
• Testing: Engineered the system using Test-Driven Development (TDD), achieving 90%+ test coverage across
core business logic using JUnit 5 and Mockito.
Java Trainee Program | EPAM | 10.2025 - 02.2026
• Selected for EPAM's highly competitive internal engineering program focused on enterprise-grade Java backend
development.
• Mastered advanced JVM internals (Memory Management, Garbage Collection), Java Concurrency, and GOF
Design Patterns.
• Developed practical, production-level skills in the Spring Ecosystem, relational database design, and unit testing
frameworks.
Skills
• Programming: Java 17 (Core, Collections, Stream API), JavaScript, HTML/CSS, XML, JSON.
• Web frameworks: Spring Boot 3, Spring Core, Spring MVC, Spring Security (JWT), Spring Cloud (Eureka,
Config Server), Spring Data JPA, Hibernate
• Test frameworks: JUnit 5, Mockito
• Database: PostgreSQL, H2, JDBC
• Tools & DevOps: Apache Kafka, Docker, Docker Compose, Maven, Git, Flyway, Zipkin, Micrometer,
Resilience4j, Postman, Swagger/OpenAPI, GitHub Actions (CI/CD)
• Cloud: AWS (EC2, RDS)
• Tech concepts: Microservices, RESTful APIs, Event-Driven Architecture, OOP, SOLID, TDD, Design Patterns,
Multithreading, Java Concurrency, JVM Internals, DAO Pattern
• Languages: English - C1 (Advanced), Ukrainian - Native
Education and Certifications
Bachelor’s degree, Software Engineering
Lviv Polytechnic National University | 2024 – Present (Expected Graduation: 2028)