Данило

Daniil Butenko Kyiv, Ukraine
[open contact info](look above in the "contact info" section)
[open contact info](look above in the "contact info" section)
telegram: @budwbud
LinkedIn

SUMMARY
Java Developer with 5 years of experience in large-scale backend development within the telecom
domain. Worked on an end-to-end high-load order processing system built on domain-driven design,
event-driven architecture and cloud-native microservices. Also maintained and extended a customer data
management system with new functionality, fixing security vulnerabilities.

TECHNICAL SKILLS
 Programming Languages: Java, Groovy, SQL
 Back-End Technologies: Spring Framework/Boot, Hibernate
 Database Management: MySQL, Oracle, NoSQL ( MongoDB, Elasticsearch), H2, Liquibase
 Web Development: RESTful APIs, SOAP
 Message Brokers: Apache Kafka
 Build Tools: Maven, Gradle
 Version Control: Git, GitHub, Bitbucket
 Testing Frameworks: JUnit, Mockito, WireMock, Cucumber
 Containerization and Orchestration: Docker, OpenShift
 Agile Methodologies: Scrum
 DevOps & Observability tools: Jenkins, ELK stack, HermesJMS, SonarQube, Kafdrop, AppDynamics
 Other Tools: Jira, Confluence

PROFESSIONAL EXPERIENCE
Aug 2021 – Dec 2024
Java Developer at SYTOSS
Project: Ordering process engine for A1 Telekom Austria Group
Technologies:
Spring, Microservices, Event-Driven, Kafka, Oracle SQL, MongoDB, Webservices Communication,
Asynchronous Message Consumption, OpenShift, WebLogic Server, NodeJS, Angular, Gradle

Responsibilities:
 Migration from monolithic to microservices-based architecture, development and maintenance of
backend services for high-load distributed systems, including code reviews;
 Troubleshooting production issues;
 Supporting onboarding of new developers and providing technical guidance.

Key Achievements:
 Integrated Elasticsearch with Hibernate Search into an OpenShift-based microservices architecture,
enabling indexing of millions of orders and significantly improving search query performance;
 Eliminated all cross-system dependencies between monolithic AmdocsCRM and microservices-based
Ordering Engine by restructuring shared libraries into domain modules, enabling independent
evolution of both systems. Delivered full migration of the Ordering Engine to Java 21 from 7/11;
 Redesigned and implemented state-based action availability logic for the Order Management Cockpit,
improving code maintainability, flexibility, and scalability of operation access control.
 Dec 2024 – Dec 2025
Java Developer at SYTOSS
Project: Customer Information System for A1 Telekom Austria Group
Technologies:
Spring, Kafka, MongoDB, Oracle SQL, H2, Maven, Webservices Communication, Asynchronous Message
Consumption, BDD

Responsibilities:
 Extending and maintaining system functionality, including code reviews;
 Troubleshooting production issues.

Key Achievements:
 Played a key role in reducing vulnerabilities by over 60%, significantly enhancing the overall security
posture of the project.

EDUCATION
Bachelor of Software Engineering Sep 2018 - May 2022
Kharkiv Aerospace University

ADDITIONAL INFORMATION
Languages:
 English - Upper-Intermediate
 Ukrainian – Native
 Russian - Native

Interests: Bouldering; Writing Telegram/Discord bots.