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Victor Koliukh

@victorkoliukh

Java Developer at Hybrid Europe building event-driven microservices and optimizing Spark data pipelines in the Hadoop ecosystem.

Georgia

Message

At Hybrid Europe, I design and develop distributed Java microservices for a marTech company’s DMP block. I implemented event-driven task processing with CQRS and scheduled Spark pipelines in the Hadoop ecosystem.

I developed and maintained ETL pipelines and optimized Spark RDD jobs, reducing GC pressure from 34% to 21%. I also implemented polygon clipping algorithms and improved the throughput of geometry-related operations.

At Hybrid Europe, I migrated 40+ REST API endpoints from a monolithic application to Spring Boot microservices, with approximately 80% automated test coverage. I also developed an internal Java Telegram bot for monitoring and managing streaming Spark jobs.

Previously, I developed Big Data processes at Sberbank, including integration for the OKR project that processed over 6 TB of data in 10 days. At NIS a.d. Novi Sad, I developed custom ODI functions for ETL processes and automated data uploads from Essbase to relational databases.

Experience

Work history, roles, and key accomplishments

Current

Java Developer

Current

Hybrid Europe

Mar 2024 - Present (2 years 7 months)

Designed and developed distributed microservices using Java in the marTech company in the DMP block, implemented an event-driven architecture and CQRS pattern for asynchronous task processing.
• Designed and developed a distributed event-driven task-processing platform on a
microservices architecture. Working based on CQRS model pattern and scheduled
time-processing with spark pipelines on Hadoop

Java Developer

Sberbank

Mar 2022 - Mar 2024 (2 years)

• Developed BigData processes for the integration command within the "Risk" block.
• Achieved efficient data integration for the OKR project, processing over 6 TB of data in just 10 days.
• Refactored code from Java 8 to Java 17, enhancing performance and reliability through extensive testing.
• Collaborated with cross-functional teams to design and implement Jenkins pipelines, streamlining

Junior Java Developer

NIS a.d. Novi Sad

Oct 2020 - Mar 2022 (1 year 5 months)

• Refactored legacy code using Java 8 features, enhancing code readability and maintainability.
• Developed custom functions for Oracle Data Integrator (ODI) to streamline ETL processes.
• Spearheaded the automation of data uploads from Essbase to relational databases, significantly reducing manual effort.