Ілля

ILYA LEONOV
Java Backend Developer
[open contact info](look above in the "contact info" section) [open contact info](look above in the "contact info" section) Dnipro, Ukraine
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SUMMARY
Java Backend Developer with 1+ year of commercial software development experience and a strong foundation in
Java, Spring Boot, Hibernate, REST API, and SQL. Experienced in implementing business logic, writing tests,
troubleshooting SQL queries, and working with data persistence. Built and maintained production applications in a
team environment, while developing Java backend projects involving authentication, database management, and
external service integrations.
SKILLS
Programming Languages: Java, Kotlin
Java Core: OOP, Collections Framework, Generics, Exception Handling, Streams API
Backend: Spring Boot, Spring MVC, Spring Security, Spring Data JPA, Hibernate, JDBC, Swagger / OpenAPI,
Liquibase, Lombok, Kafka, AWS
Architecture: REST API, Clean Architecture, MVC
Database: MySQL, SQL
Tools: Git, Maven, Gradle, Docker, IntelliJ IDEA
Additional: Android, Jetpack Compose
Languages: English — B1 (Intermediate), Ukrainian — Native

WORK EXPERIENCE
Java developer
StoryShelf — Online Bookstore, March 2024 - June 2024
Tech Stack: Java, Spring Boot, Spring Security, Spring Data JPA, Hibernate, MySQL, Docker, Liquibase, Swagger, Mockito.
Developed REST API endpoints for book catalog management, shopping cart operations, and order processing.
Implemented user authentication and authorization using Spring Security.
Designed database entities and relationships using Spring Data JPA and Hibernate.
Configured database schema migrations with Liquibase and containerized the application using Docker.
Used Swagger to document and explore REST API endpoints and Mockito to support automated testing.
GitHub: StoryShelf
GoDrive — Car Rental Platform, December 2025 - January 2025
Tech Stack: Java, Spring Boot, Spring Security, Spring Data JPA, Hibernate, MySQL, Docker, Liquibase, Stripe API,
Telegram API.
Implemented user authentication and authorization using Spring Security.
Integrated Stripe API to support online payments for car rentals.
Implemented Telegram notifications to inform users about booking and payment events.
Configured database schema migrations with Liquibase and containerized the application using Docker.
Developed REST API functionality for vehicle booking, fleet management, and administrative reporting.
GitHub: GoDrive
Android Developer, VRG Soft | May 2025 - July 2026
Developed and maintained production Android applications using Kotlin, collaborating closely with backend
engineers, QA specialists, and product managers.
Integrated RESTful APIs and implemented reliable communication between mobile applications and backend
services.
Designed and maintained a local persistence layer using Room, implementing 5+ database schema migrations
while ensuring backward compatibility.
Built an offline-first architecture with synchronization between local storage and remote backend services.
Introduced 10+ production features across multiple Android applications.
Resolved 50+ production issues, improving application stability, reliability, and overall user experience.

Java Developer, Charity Project - Obminyashka | Oct 2024 - Dec 2024
Wrote unit tests covering two layers of business logic to verify application behavior.
Investigated and fixed SQL query issues related to specific categories.
Resolved data persistence issues using JPA and Hibernate.
Analyzed existing backend code to identify and fix bugs.
EDUCATION
Oles Honchar Dnipro National University, 2024
Master of Laws degree