Георгій

Georgiy Kozak
Scala/BigData Engineer

Summary
I'm a Scala Engineer with a mathematical background and 2+
years of commercial experience, specializing in building
Contacts production ETL/ELT pipelines and back-end services. Looking for a
company for long-term co-operation.
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[открыть контакты](см. выше в блоке «контактная информация»)
Experience
Kharkiv, Ukraine

https://t.me/GeorgeKozak 07/2025 - 12/2025

Scala/Big Data Engineer | StackTome
https://github.com/
GeorgiyKozak D2C e-Commerce platform
• Implemented, deployed and maintained production ETL/ELT
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pipelines for processing eCommerce data using Scala and Apache
kozak-942968241
Spark • Implemented complex data transformations with Spark SQL,
using Parquet and Delta tables • Diagnosed and resolved data
Skills quality issues, SQL problems and failing Spark jobs in production •
Led a major upgrade of the core data processing module: migrated
Scala Python Apache Spark from 3.5 to 4.0 and upgraded the project from Scala
2.12 to Scala 2.13 with aligned dependencies • Integrated multiple
Databases: PostgreSQL,
external platforms (Shopify, Trustpilot, Centra, Klaviyo, Google APIs)
MongoDB, MS SQL
via REST and GraphQL • Worked with AWS S3-compatible object
Typelevel: Cats, Cats Effect, storage using Apache Spark
Http4s
08/2024 - 07/2025
Slick Play Framework
Scala Engineer | Center Cruises
Apache Spark AWS S3
• Developed back-end services and APIs for the cruise company’s
Sbt Git Docker
website, supporting bookings and customer-facing features •
ScalaTest Circe Munit Implemented data import pipelines for multiple formats (JSON, XML,
CSV) ensuring data quality for supplier information • Worked on
integration with internal accounting platform via Protobuf, enabling
Languages automated synchronization of booking and cruise sales data •
Developed and maintained website for data display
English - B2 (upper intermediate)
09/2023 - 06/2024
Ukrainian - native Robotics and Programming Teacher | Robot School
Russian - native Java, Python, Robotics
 08/2022 - 08/2023

Scala Engineer | Wolkov Consulting
Developed back-end and web services across multiple client projects:
• Wrote unit and integration tests to ensure code quality and
reliability • Implemented integrations with third-party libraries and
APIs • Assisted team members with their tasks • Participated in code
reviews and technical discussions

08/2021 - 11/2021

Trainee Java Developer l EPAM Systems

Education

Università degli Studi dell'Aquila (Italy)
Master | Applied Mathematics
2023 - 2025

V. N. Karazin Kharkiv National University
Master | Applied Mathematics
2023 - 2025

V. N. Karazin Kharkiv National University
Bachelor | Mathematics and Computer Science

2019 - 2023

Coursera courses:
Big Data Analysis with Scala and Spark
Functional Programming Principles in Scala
Parallel Programming in Java
Software Development Processes and Methodologies

SkillSoft courses:
Getting Started with Apache Kafka
Integrating Kafka with Python & Using Consumer Groups