Ilya

Ilya Samilyak PROFILE
• Skilled Java Developer with over two years of
Java Developer commercial experience in backend development using
Java Core, Spring Boot, and Hibernate.
[open contact info](look above in the "contact info" section) • Proficient in designing scalable architectures,
[open contact info](look above in the "contact info" section) integrating third-party services (Stripe, Telegram API),
and optimizing database performance.
Kyiv
• Detail-oriented and constantly improving technical
LinkedIn knowledge to deliver high-quality solutions and
Github contribute effectively to team goals.

Telegram
PROFESSIONAL EXPERIENCE
SKILLS Java Developer
Self-employed
04/2025 – Present
Java — (8, 17, 21), Core, Collections, OOP, SOLID,
Microservices Designed and maintained microservice-based
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backend systems for small business clients using Java
17/21 and Spring Boot 3, focusing on automation of
DB — Hibernate, JDBC, MySQL, H2, MongoDB, internal workflows and API integrations.
PostgreSQL, Redis Developed automated web-scraping modules using
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Jsoup for real-time data collection and processing from
external market sources.
Spring — Boot, Core, Web, Security, Cloud
Designed and integrated third-party APIs, including
•

payment gateways and messaging services for
Web Development — Servlet, JSP, Tomcat, HTML, automated notifications.
CSS, XML, Angular (basic), React (Basic) Reduced average API response time by ~40% by
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introducing Redis caching and optimizing SQL queries
with advanced indexing strategies.
Tools — JUnit, Mockito, Maven, Gradle, Swagger,
Liquibase, Docker, Lombok, Mapstruct, Postman, Java Developer
IntelliJ IDEA NDA - Contract
05/2023 – 02/2025
Containerization & CI/CD — GitHub Actions, GitLab Designed and developed scalable microservices using
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CI/CD, Jenkins (basic) Java 17 & 21 and Spring Boot 3, implementing the
Event-Driven SAGA pattern via Apache Kafka to
ensure distributed data consistency and handle
Testing — JUnit 5, Testcontainers, WireMock compensation transactions.
Engineered a hybrid communication strategy: utilized
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Message brokers — Kafka, RabbitMQ OpenFeign for synchronous read-operations and Kafka
for high-throughput transactional processing, while
leveraging RabbitMQ for asynchronous user
Team Practices & Communication — Kanban, Jira, notifications.
teamwork, and effective communication Built REST APIs and integrated them with external
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services such as Stripe (payment processing) and
Telegram API (automated notifications).
EDUCATION Managed relational (MySQL, PostgreSQL) and NoSQL
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Master's degree in Law (MongoDB) databases; optimized schemas, SQL
Yaroslav Mudryi National Law University queries, and indexes to improve performance of data-
Kharkiv, Ukraine heavy operations.
Implemented caching mechanisms (Redis) to improve
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response times and reduce database load.
COURSES Configured containerization with Docker and
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Java course at Mate-academy implemented a full observability stack, including
distributed tracing (Zipkin), metrics monitoring
Kyiv, Ukraine
(Prometheus), and centralized logging (Promtail, Loki,
OOP, Java 8+, Spring, Hibernate
Grafana).
Udemy Covered business-critical features with unit and
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- Java for Beginners: From Scratch to Oracle integration tests (JUnit, Mockito, Testcontainers) to
Certification ensure system reliability.
- Java–Earn Your Black Belt!
Achievements:
- Spring for Beginners
Reduced payment processing time by 25% by
•

optimizing Stripe Checkout session handling.
LANGUAGES Improved performance of data-heavy operations by
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English 30% through SQL query optimization and indexing.
Automated key communication tasks via Telegram bot,
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reducing manual work for the support team.