Олег

HOLUB OLEH
JAVA DEVELOPER
 [відкрити контакти](див. вище в блоці «контактна інформація»)  [відкрити контакти](див. вище в блоці «контактна інформація»)  Kyiv

Education
2007 State University Information-Communication Technologies
Master's degree Information Technologies

Lenguages
Ukrainian native
English upper intermediate

Summary
Backend developer with experience of development and refactoring hi-load API, which integrated companies in the
commercial and government sectors. Attentive to details of the business process. Skilled on designing complex
technical solutions that involve a development team with control of implementation of each stage. Adept at integration
with various services and collaborating with teams from diverse companies.
Looking for an opportunity to be part of modern and experienced development team.
Full-time
Of ice/remote

Key skills
Spring boot, MVC
Maven, Gradle
Hibernate, JDBC
Oracle, MySQL, PostgreSQL criterias, stored procedures
Ka ka, Apache ActiveMQ
Deployment CI/CD Docker (GitLab), Tomcat for legacy projects
AWS S3
 Experience
Ukrposhta Development of an API service composed of a structure of restful services that
Senior Java Developer interact with each other. Integrated with the API are both own services and
lead of API dev.team applications and key partners such as marketplaces (Prom, OLX, Rozetka), as well
as State companies (Ministry of Defense, Naftogaz).
01/2022 - 03/2026
Integration with third-party services, such as Tranzzo, Ukrcard, to create a
service that allows payments from the customer's personal account, and provision
this functionality externally for use by clients (commercial organizations,
marketplaces).

Responsibilities:
Analytics of business requirements before the technical implementation of new
products and services. Development and code reviews. Version maintenance with
deployment preparation. During my time there I released a number of new
products for the company and created a new payment service for the company’s
customers and partners.
Performed refactoring of legacy services:
• Moved some interactions between services to brokers
• Optimized the number of database queries by hashing data
• Migration parts of functionality into separate services to optimize the load
on the core system.

Experience
Ukrposhta Development of restful services for exchange of data and iles between the front
Java Developer (automated workstation in of ices) and the Oracle database for recording and
storage information about logistics, inancial and service information.
01/2020 - 01/2022
As backend developer took part in the implementation of system for automatic
registration iscal receipts in the State Tax Service

Responsibilities:
writing code, implementation new functionality, deployment

Experience
UTTC Group Implementation of corporate telecommunication projects for small and
Brand manager ERICSSON-LG medium-sized businesses across the entire CIS region.
01/2012 - 12/2019