Oleksandr

Oleksandr Y.

Senior Software Engineer | Java Backend Developer | Database Developer

Professional Summary

Seasoned software engineering professional with extensive experience contributing
to complex enterprise web development projects. Strong background in designing
database applications, web services, and CRM solutions within Agile team environments.
Collaborative team player focused on building secure, maintainable, and scalable systems
while delivering high-quality outcomes across both backend architectures and Java-based
user interfaces.

Core Competencies

 Backend: Java (8-21), Spring (Boot, MVC), REST API, OpenAPI 3.x, SOAP,
Microservices.

 Java UI & Frontend: Vaadin, GWT, Apache Wicket, JSP/JSTL, HTML/CSS.

 Databases & Cloud: PostgreSQL, Oracle RDBMS/PL-SQL, AWS (S3, QuickSight).

 Tools & DevOps: Docker, Git, Gradle, Maven, CI/CD pipelines.

 Quality Assurance: JUnit 5, Mockito, Testcontainers, EasyMock.

 Methodologies: Agile, Scrum SAFe, Kanban, Cross-functional collaboration.

Professional Experience

Java Web Developer | Global IT Consulting Firm

 Acted as the sole developer and technical lead to architect and develop a REST
integration service connecting Salesforce with Oracle Financials.

 Implemented payload transparency and dynamic attribute handling, ensuring
system resilience during Oracle maintenance.

 Collaborated with the ECOM team to maintain core operations for shopping cart,
order management (OMS), and invoicing systems, and contributed to Admin UI
development using Vaadin.

 Operated within diverse Agile environments, seamlessly adapting to both Scrum
SAFe and Kanban methodologies across multiple cross-functional teams.
  Set up CI/CD pipelines and prepared comprehensive technical documentation for
the integration project.

 Tech Stack: Java 17/21, Spring Boot, REST, OpenAPI 3.x, PostgreSQL, AWS S3,
Gradle, MyBatis, Vaadin, JUnit 5, EasyMock, Testcontainers.

Key Engineer / Database Engineer | Leading Insurance Technology Provider

 Worked within a cross-functional Scrum SAFe environment with developers and QA
engineers to support and improve web-based solutions for the insurance
distribution channel.

 Contributed to the development of new application functionality and assisted the
team in integrating an Amazon QuickSight BI solution.

 Participated in testing, bug fixing, and supporting the release process.

 Tech Stack: Java 11, Spring Boot, REST/SOAP, Oracle PL/SQL, PostgreSQL, AWS
QuickSight, Hibernate.

Fullstack Engineer / Database Engineer | Top-Tier Telecommunications Company

 Collaborated with a Scrum team to modernize the architecture for Retail and Care
channels during a major 5G network expansion project.

 Identified and resolved workflow issues in the Care channel and updated necessary
data in the CMS system.

 Tech Stack: Java, REST API, AngularJS, Gradle, Commercetools.

Java Developer / Database Engineer | Global Information Services Provider

 Teamed up to develop and deploy microservices modules for an open-source library
services platform (FOLIO).

 Provided support, implemented new features, and fixed issues for services related
to customers, inventory, and finances.

 Tech Stack: Java, Spring Boot, REST API, OpenAPI, PostgreSQL, Docker, Eclipse
Vert.x.

Earlier Career Highlights

 Engineer (Infrastructure/Database): Developed integration tests for mobile device
management (MDM) infrastructures and modernized the admin console UI by
migrating functionality from JSP to a GWT stack.
 o Core Tech: Java, Spring, REST API, GWT, JSP/JSTL, SQL, Active Directory.

 Data Analyst / Engineer: Created solutions to standardize medical drug
vocabularies and maintained database migrations.

o Core Tech: Java 8, Oracle PL/SQL, PostgreSQL, Groovy.

 Java Web Developer: Developed reporting subsystems and implemented flexible
web UI components using Apache Wicket for a major online language-learning
platform.

o Core Tech: Java, REST API, Apache Wicket, MySQL, MyBatis, JavaScript.

 Engineer / Java Developer: Customized customer-centric, web-based CRM billing
systems for telecom operators.

o Core Tech: Java, Oracle RDBMS/PL/SQL, XML/XSLT, SOAP.

 Engineer / Business Analyst: Designed and implemented client-server database
applications for information retrieval in the gas industry.

o Core Tech: Oracle RDBMS, Oracle PL/SQL, SQL.

Education

 Master's Degree (Equivalent) with Honors in Computer Science and Systems
Engineering Kharkiv National University of Radio Electronics (KNURE) | Kharkiv,
Ukraine.