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Work experience

Java developer

from 02.2024 to 05.2025 (1 year 3 months)
Sigma Software, Дистанційно (IT)

-Worked on backend development using Java, Spring Boot, and RESTful Apis
-Worked with SQL (Oracle) and used Hibernate/JPA for ORM.
-Developed, tested, and integrated REST APIs for frontend communication and third-party services.
-Code Optimization & Refactoring – Improved application performance, fixed bugs, and implemented new features.
-Wrote unit tests using JUnit, and Mockito; performed debugging and troubleshooting.
-Worked in a Scrum team, participated in daily stand-ups, code reviews, and used Git (GitHub/GitLab).
-Maintained technical documentation and continuously learned new technologies and best development practices.
Achievements:
-Reduced API response time by reviewing data processing logic.
-Increased request processing speed after switching to a modern stack (Spring Boot, Kafka, Oracle).
-Implemented asynchronous task processing via @Async and CompletableFuture, reducing the load on the server
-Developed integration with Prometheus + Grafana, which allowed detecting failures in microservices in real time.
Stack:
Java 21 , Spring Boot, Spring Data,Spring Security Hibernate, Oracle, Maven, Git, JUnit, Mockito, Docker, AWS, Kafka, Redis, Prometheus , Grafana, GitLab, Scrum.

Java developer

from 03.2022 to 12.2023 (1 year 9 months)
Ciklum, Київ (IT)

Worked on backend development using Java, Spring Boot, and RESTful APIs in a microservice architecture.
-Migrated legacy monolithic modules to microservices, increasing system scalability and flexibility.
-Improved application performance by optimizing data processing pipelines, reducing response.
-Refactored outdated modules with a modern technology stack, boosting request processing speed.
-Implemented asynchronous task processing using messaging queues (e.g.,RabbitMQ), reducing server load significantly
-Set up system monitoring and health checks for microservices, enabling faster issue detection and incident response.
-Configured automated data backups and disaster recovery strategies, reducing downtime after failures.
-Upgraded database systems (e.g., to the latest PostgreSQL version), improving query performance.
Achievements:
-Optimized data processing, which reduced latency, and also rewrote an outdated module, improving query processing speed significantly.
-Converted the monolith to a microservice architecture, updated the database to a new version, which resulted in a increase in performance and a reduction in update time.
-Implemented asynchronous task processing, which reduced the load and improved stability under high load.
Stack:
Java 11 , Spring Boot, Spring Data, Hibernate, PostgreSQL, Maven, Git, JUnit, Mockito, Docker, Azure, RabbitMQ, Redis, Scrum.

Education

Польско-Японська академія інформаційних технологій

Інформатика, Варшава
Higher, from 2019 to 2022 (3 years)

Knowledge and skills

• Redis
• HTTP
• Spring Security
• Spring Data JPA
• Spring MVC
• SQL
• Spring Framework
• Spring Boot
• Java Core
• Hibernate
• HTML
• IntelliJ IDEA
• MySQL
• Apache Maven
• PostgreSQL
• JUnit
• CSS
• Docker
• Java
• Знання технологій JDBC
• Знання принципів ООП
• Git
• Цілеспрямованість

Language proficiencies

• English — above average
• Polish — average
• Spanish — average