Денис

DENYS SLOZKIN
JAVA DEVELOPER
[відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | https://t.me/Den1613

SUMMARY
Software Developer with 4 years of experience in Java development within the Enterprise sector
(Telecommunications). Specialized in migrating legacy monoliths to modern architectures, designing user
stories from scratch, and delivering new features for large-scale international projects.
Strong analytical mindset with a focus on system scalability and design.

TECHNICAL SKILLS
• Java 7-21
• Spring: Spring Boot, Spring MVC, Spring Data JPA, Spring Security, Spring WebFlux
• Databases: Oracle SQL, MongoDB, Hibernate, Liquibase,
• DevOps & Tools: GIT, Jenkins, Docker
• Monitoring & Logging: Elasticsearch, Logstash, Kibana (ELK Stack)
• Application Servers: OpenShift, WebLogic, Tomcat
• API: REST, SOAP, WebClient, Kafka, BPMN

PROFESSIONAL EXPERIENCE
Sytoss, AI developer June 2025 - January 2026
Technologies: Python, Ollama, HuggingFace, ChromaDB, Weaviate
Designed and implemented LLM-based solutions for information retrieval and generation using both
online (API) and local models.
Developed and optimized prompt engineering strategies to enhance model accuracy, relevance, and
contextual understanding.
Implemented Retrieval-Augmented Generation (RAG) pipelines leveraging Vector Databases (e.g., storing
and retrieving embeddings) for grounding responses with proprietary data.
Successfully utilized LLMs to generate comprehensive documentation for a large, multi-modular legacy
project, significantly improving knowledge transfer and reducing ramp-up time.
Sytoss, Java developer Aug 2022 - June 2025
Technologies: Java, Spring, Oracle SQL, REST/SOAP, OpenShift, ELK
Designed and developed new features based on user stories
Implemented and supported web services using REST and SOAP
Worked with Oracle SQL and MongoDB; managed schema changes using Liquibase
Maintained and monitored production environment
Migrated legacy modules to a new cloud platform (OpenShift)
Created and configured Jenkins pipelines and Docker Compose files
Key achiviements:
Drove the phased migration of key modules from the monolithic application to independent
microservices, significantly improving the scalability and maintainability of critical functions.
Migrated a major legacy regression testing framework from the monolith to a high-performance Spring
WebFlux microservice. Implemented comprehensive logging and error handling, reducing the full
regression suite execution time by 75% (from 2 hours to 30 minutes).
Modernized the Business UI deployment: migrated the application from a Tomcat environment to
OpenShift (via Docker containerization), and developed a robust, efficient Jenkins pipeline for continuous
deployment.
Managed the full lifecycle of production support tickets (Jira), performing rapid bug fixes and authorized
manual data remediation on live systems to maintain critical business operations.
 PROFESSIONAL EXPERIENCE

SoftServe, Java developer Feb 2022 - Aug 2022
Technologies: Java, Spring WebFlux, Azure
Starting project from scratch using reactive programming paradigm
Designed and developed new features based on user stories

EDUCATION
Bachelor of Computer Engineering Sep 2015 - Jun 2019
Kharkiv National University of Radio Electronics

ADDITIONAL INFORMATION

Languages:
English - Upper-Intermediate
Ukranian - Native