Konstantin

Kostiantyn Andrushchenko Ukraine, Kharkiv
[open contact info](look above in the "contact info" section)
Java/Kotlin developer / Software engineer (Phone/Telegram/Viber/
Whatsapp)
Summary: [open contact info](look above in the "contact info" section)
• Back-end developer [open contact info](look above in the "contact info" section)
• have experience in development commercial gaming platforms Telegram: @pantheros
• have an understanding of event-driven models
• have experience in multithreading / concurrency
• familiar with Docker and Linux

EXPERIENCE MAIN SKILLS
DigitalHouse LLC, Luhansk– Java developer Java 7, 8, 11+, 17, 21
jun, 2008 – aug, 2015 Stream API, Multithreading,
PragmaticPlay, Kyiv – Java developer Collections, Spring Core,
aug, 2015 – jul, 2020 Spring Boot, MVC, Data,
iTransition, Minsk – Java developer Cloud, etc. Netty, Apache
dec, 2020 – oct, 2022 MINA, gRPC, JDBC, JPA,
Self-employed/freelance (jan 2023 – jun 2024) ORM, Hibernate,
Mindy Teams, Kyiv – AI/ML data analyst RabbitMQ, Kafka
jun 2025 – sep 2025 Servlets, JSP, JSTL, Struts
Imperia Holding, Lviv – AI data annotator Unit test frameworks:
oct 2025 – jan 2026 Junit, Mockito
Facer, Kyiv – AI data annotation operator
Frontend:
mar 2026 – present
HTML, CSS, XML,
EDUCATION JSON, Javascript, JQuery
Volodymyr Dahl East Ukrainian National University, Databases:
Luhansk. Bachelor degree, 2006 – 2010
MySQL, Postgres, Oracle
Economic cybernetics. Automated computer integrated information MongoDB, Redis, Liquibase
management systems and technologies Software engineer
Version control:
PROJECTS SVN, Git
• RESTful microservices with several purposes: Gateway API, Game Build tools:
servers, DB access services, facade services to external systems Ant, Maven, Gradle
• Web admin applications for system configuration and financial App servers:
reports building
Resin, Tomcat
• Socket / websocket chat servers which provide communication
Other:
between game clients and support service
Docker, K8s
• Communicator applications to external mailing services
Consul discovery service
• Custom clustering of stand-alone chat servers Jmeter, Postman, Swagger
• IP telephony services based on Asterisk Regular expressions
• Applications for parsing and processing files with custom format JConsole, VisualVM
All the projects were long term. Bugzilla, Jira, Confluence
Familiar with CI/CD
Jenkins
Participated in:
Windows, Linux user
• Development; solutions designing Python scripting (support
• Refactoring of applications; legacy functionality support or hotfixing level)
• Bug fixing, Unit tests writing LANGUAGES
• Tasks planning Українська (native)
• Worked in small teams (3-5 persons; Scrum / Agile processes) English (Up.-Intermediate/B2)
Русский (native)

Additional info about me:
- have experience with MS Office, Libre Office, Adobe Photoshop, Corel Draw, Adobe Acrobat,
Google Suite.
- have skill of fast touch-typing (blind typing).
- advanced PC user (Windows/Linux).
- experience of PC maintenance (OS deployment, settings and tuning, service); PC assembling.
- have skills of processing and annotating data sets for AI learning (images and videos).
- 1 year of experience working in an internal technical support department (processing
requests, analyzing application logs, making quick fixes or delegating complex tickets to
another level of the department or to the development team according to procedures).