Leonid

Leonid Sivko [open contact info](look above in the "contact info" section) ​
[open contact info](look above in the "contact info" section)
Java Developer GitHub
LinkedIn
Telegram: @Leonid_Sivko​
Kyiv, Ukraine
Summary
Java Developer with 4+ years of commercial experience looking for opportunities to work on
interesting projects and learn new technologies. I have a strong knowledge of Java Core and Java
Web. I have experience working with technologies like SpringBoot, Hibernate, Redis, JDBC, Docker,
PostgreSQL, MySQL, MongoDB. Well familiar with OOP, SOLID, DRY and KISS principles.

Technical Skills
●​ Extensive knowledge in OOP, SOLID, Design patterns, Clean Code
●​ Technologies/Frameworks: Java Core, Spring (IOC, Web MVC, Security, Data Jpa, Test), REST,
Hibernate, Redis, TomCat, JSP, Maven, JUnit, Spock, Mockito, Liquibase, Docker
●​ DBMS: PostgreSQL, MySQL, MSSQL, MongoDB
●​ Web Development: HTML, XML, JSON
●​ Version Control Tools: Git, SVN

Work experience

Java Developer at Calaton Systems
Nov. 2023 - now Project: https://www.corvuslink.com/ - saas platform. Corvus Link is a
(1y. 6m.) cloud-based solution that helps businesses plan, build, and grow their ideas in a
single tool.
Technology stack: Java 17, SpringBoot 3, Hibernate, Redis, Postgres SQL,
Liquibase, REST, WebSocket, OAuth 2.0, OpenAPI (Swagger), Maven, Docker,
JUnit, Git, AWS
Integration with OpenAI, Stripe, Google, Microsoft, Jira

Java mentor at Mate Academy (part-time job)
Aug. 2022 - ●​ Students homework review
Apr. 2024 ●​ Support in Slack
(1y. 8m.) ●​ Mock interviews
●​ Study program and task improvements

Java Developer at CustomerTimes
Aug. 2021 - Project: https://www.envisionpharmagroup.com/technology - management of
Oct. 2023 scientific, research, and medical publications in the pharmaceutical industry
(2y. 2m.) Technology stack: Java EE 8, Hibernate, MS SQL, Liquibase, JSF, Gradle, JUnit,
Spock, SVN/Git

Java Developer at ProgForce.com
Dec. 2020 - Projects:
Aug. 2021 -​ https://eurofins-dms.com/ - internal admin application
(8 months) Technology stack: Java EE 8, JDBC, MySQL, REST, Gradle, Bash scripts, Git
-​ FIIX - a mobile app for dating
Technology stack: Groovy, Grails, JPA (GORM), REST, MySQL, MongoDB, Gradle
 Java Developer at ZyxIT
Oct. - Dec. 2020 Project for the Ministry of Natural Resources of Kazakhstan
(3 months) Technology stack: Java 8, Spring Boot, LifeRay, JDBC, JSP, JavaScript, Maven, Git

Courses
Foxminded: GRASP and GoF Design patterns
Date: Oct 2024

Foxminded: Enterprise patterns
Date: Feb 2025

Education
National Technical University of Ukraine «KPI»​
Specialist degree, printing and publishing process engineer
2002 - 2008

Additional information
Languages:
English (Upper-Intermediate)

Self-education, books:
Clean Code by Robert Martin, Thinking in Java by Bruce Eckel

Algorithmic tasks:
Codewars (Java/ SQL) 4 level, 150+ solved tasks

Hobbies:
Chess (national 1st category), cycling, shooting