Oleg Gumennyi
Senior Java FullStack Developer at DataArt
Ukraine
Summary
👤
Senior🎓
Top SchoolOleg Gumennyi is a Senior Java FullStack Developer with nine years of experience building Java web applications that manage large databases, currently delivering solutions at DataArt. He brings deep expertise in Java EE (EJB, JPA, JMS), Spring MVC, JDBC/Hibernate, Oracle/MySQL databases and production servers such as Tomcat and WebLogic, alongside solid skills in CI, testing and version control. His background includes systems integration (Maximo with SAP), PL/SQL tuning and hands-on migration and refactoring of server-side code, including secure JWT handling and DAO improvements in the DeviceHive open-source project. Comfortable across the full stack, he also leverages frontend tools (HTML/CSS/JavaScript, Ajax) and legacy GUI toolkits (Swing/AWT), enabling pragmatic end-to-end solutions. Fluent in English, Russian and Ukrainian, he combines academic training in applied mathematics with experience in high-performance and cluster computing from early scientific work, giving him a strong edge in algorithmic and performance-sensitive development.
9 years of coding experience
7 years of employment as a software developer
Igor Sikorsky Kyiv Polytechnic Institute
English, Russian, Ukrainian
Github Skills (11)
devicehive10
javas10
java10
spring-boot10
jwt9
rest9
postgresql7
websocket7
microservices6
microservices-application6
database-design6
Programming languages (2)
Github contributions (5)
devicehive/devicehive-java-server
May 2017 - Jun 2017
DeviceHive Java Server
Role in this project:
Back-end Developer
Back-end DeveloperContributions:18 commits, 22 PRs, 22 pushes in 1 month
Contributions summary:Oleg primarily focused on refactoring and updating existing back-end code, migrating parameters and modifying method signatures. They implemented changes to support a boolean sort order parameter across multiple DAOs within the DeviceHive framework. Furthermore, the user made modifications to JWT secret handling, utilizing environment variables for secure token management. Additional contributions included updates to device registration logic and unit test fixes.
devicehive-java-serverdataartwebsocketszookeeperdevicehive
ogumennyi/devicehive-java-server
Apr 2017 - May 2017
Contributions:2 pushes, 4 branches in 26 days
javadevicehivedevicehive-java-serverjava-server
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