Ілля

Ilya Demerza
Java Developer

CONTACT: PROFILE:
Java Backend Developer with 1 year of commercial experience in
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Spring Boot development. Experienced in building and maintaining
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REST APIs, working with PostgreSQL, Spring Security, Hibernate,
Kyiv
JUnit 5, and Docker. Passionate about backend development and
https://github.com/El-Mangusto
continuous learning.

SKILLS: EXPERIENCE:
Java JAVA DEVELOPER I JUL 2025 - PRESENT

SQL (PostgreSQL, SQLite, MS SQL) Developed and maintained RESTful APIs using Java and Spring
Boot.
Hibernate
Implemented new business features, including new REST
Spring Boot
endpoints and enhancements to existing functionality.
Spring Data JPA
Fixed production issues and refactored backend components
Spring Security
to improve maintainability and code quality.
REST API Worked with PostgreSQL, Spring Data JPA, and Hibernate.
Docker Implemented request validation, pagination, filtering, and global
Git exception handling.

JUnit Wrote unit and integration tests using JUnit 5, Mockito, AssertJ,
and Testcontainers.
Mockito
Participated in code reviews and collaborated with developers
Maven
to maintain and extend a large backend codebase.
Developed internal administrative tools and forms using Retool.
EDUCATION: Documented REST APIs using Swagger/OpenAPI.
KYIV AVIATION INSTITUTE Worked with Git, Maven, and Docker throughout the
(FORMERLY NATIONAL AVIATION development process.
UNIVERSITY)
PROJECT:
Computer Engineering
2022-2026 Car Rental Backend Service (in progress) — Spring Boot
backend for a car rental platform: booking logic with overlap-
based availability, Flyway migrations, unit + Testcontainers
LANGUAGE:
integration tests.
English - A2 Corp Net Monitor — Spring Boot backend for network/sensor
Ukrainian - Native monitoring (SNMP polling, scheduled metric collection, REST
API, PostgreSQL) + Vite/Chart.js dashboard. (bachelor's thesis)