Volodymyr

VOLODYMYR MILYUKOV
Senior Java Developer

📍 Lviv, Ukraine 📧 [відкрити контакти](див. вище в блоці «контактна інформація») 📱 [відкрити контакти](див. вище в блоці «контактна інформація»)

PROFESSIONAL SUMMARY

Seasoned Software Engineer with over 20 years of experience in Java, specializing in the
design and development of high-load, mission-critical enterprise systems. Deep expertise in
modernizing legacy applications and building scalable backend services using Spring
ecosystem and reactive programming. Proven track record of leading complex projects from
concept to production, optimizing database performance, and ensuring high system
reliability. Experienced in mentoring teams and collaborating effectively with cross-
functional stakeholders to deliver business value.

TECHNICAL SKILLS

Core Competencies:
Enterprise Backend Development, System Architecture (Hexagonal, Clean), Legacy
Modernization, High-Load Systems, Distributed Systems, Multithreading, REST API Design,
Reactive Programming
Languages:
Java (22, 17, 11, 8), JavaScript, TypeScript
Frameworks:
Spring (Boot, MVC, WebFlux, Security, Data, WebFlow), JPA/Hibernate, EJB, JMS, Project
Reactor, Swing/AWT, GWT
Data Technologies:
PostgreSQL, Oracle, MS SQL Server, JDBC, PL/SQL, Liquibase, Cassandra
DevOps & Tools:
Docker, AWS (S3, ECS), Maven, Ant, GitHub Actions, TeamCity, Jira, Postman
Testing:
JUnit, TestNG, Mockito, Cucumber
Methodologies:
Agile (Scrum, Kanban), TDD, Code Review

WORK EXPERIENCE

Group 107 — Java Backend Developer
Apr 2023 – Dec 2025
▸ Healthcare accessibility platform: mobile laboratory services with real-time scheduling
and secure medical data processing
  Architected and developed core backend services using Spring Boot 3 and
Hexagonal Architecture, ensuring clean separation of concerns and high testability
 Designed and implemented secure RESTful APIs for patient management,
scheduling, and authentication
 Integrated AWS S3 presigned URLs for efficient upload of large medical documents,
significantly improving UX
 Optimized PostgreSQL performance through query tuning, reducing average
response times by 30%
 Implemented JWT authentication with refresh tokens and integrated
Twilio/SendGrid for notifications

Group 107 — Java Backend Developer
Aug 2021 – Mar 2023
▸ Unified microservice platform for SMBs: centralized operations, payments, and third-
party integrations

 Developed and maintained microservices using Spring Boot 2.7, adhering to SOLID
principles
 Engineered resilient integrations with external APIs: Stripe, Monday.com, Amazon
SP API
 Managed database versioning with Liquibase and optimized complex PostgreSQL
queries
 Automated API documentation with Springdoc OpenAPI (Swagger) for seamless
frontend adoption

Vakoms — Software Engineer
Nov 2019 – July 2021
▸ Global content discovery platform: billions of personalized recommendations

 Took end-to-end ownership of backend services in a real-time big data ecosystem
processing 20TB+ daily
 Contributed to high-performance systems for content personalization and real-time
bidding
 Tech stack: Java, Spark, Kafka, Cassandra, Hadoop, Vertica

EPAM — Software Engineer
July 2019 – Nov 2019

 Developed features for SAP Marketing platform using Java 8, Spring Boot, and
Spring WebFlux
 Applied reactive programming principles to ensure system stability and performance

Conscensia — Software Engineer
Sep 2013 – Nov 2019
  Modernized legacy Swing-based desktop applications for Danish hospitals,
improving workflow efficiency
 Developed backend services for tax reporting platform using Spring MVC, EJB, JPA,
Oracle WebLogic
 Engineered SOAP web services and Angular 5 frontend for municipal data exchange
platform
 Implemented comprehensive testing: unit, integration, and automated GUI tests

EPAM — Java Hardware Engineer
May 2011 – Aug 2013

 Developed embedded Java (Pi4J) applications for Raspberry Pi hardware control
 Integrated sensors via I2C, SPI, PWM protocols and configured Linux environments

Zert AB — Software Engineer
Sep 2009 – May 2011

 Developed UI components for multi-platform risk management system using GWT,
AWT, and Swing
 Deep expertise in Java desktop GUI development (custom components, layout
management, event handling)

SoftServe — Software Engineer
Feb 2008 – April 2009

 Developed enterprise web apps with Spring WebFlow, Hibernate, JSP, Servlets
 Managed code integration and deployment processes

Lohika — Software Developer
Feb 2002 – Feb 2008

 Designed custom plugins for Atlassian Jira and Confluence
 Worked on diverse enterprise projects: web apps, client-server modules using Java
Servlets, Struts, XML/XSLT

Lviv Regional SES — Programmer-Engineer
Jan 2000 – Apr 2002

 Developed client-server applications and administered databases (Oracle, MS SQL)

EDUCATION
Master's Degree in Computer Science
Lviv Polytechnic National University
2000

LANGUAGES

 English — Upper-Intermediate
 Ukrainian — Native